TY  - JOUR
AU  - Đorđević, Dejana
AU  - Pokrajac, Dubravka
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3339
AB  - Sa hidrauličkog stanovišta, prostorni raspored vodene vegetacije u koritima i na obalama vodotoka je slučajan i nezavisan od karakteristika toka. Vegetacija svojim prisustvom pruža otpore kretanju vode i utiče na tran-sportne procese i procese mešanja. Proračun otvorenih tokova sa promenljivim prostornim rasporedom vege-tacije zahteva da se prilikom numeričkog modeliranja vodi računa o konvektivnim članovima, jer oni pored zavisno promenljivih sadrže i prostorno promenljivu poroznost usled prisustva vegetacije u koritu. U ovom radu se za opis linijskih otvorenih tokova sa promenljivim rasporedom vegetacije koriste trostruko osrednjene Navije-Stoksove jednačine (Depth-Integrated Double-Averaged Navier-Stokes - DIDANS equations). Prikazan je postupak njihovog numeričkog rešavanja primenom metode konačnih zapremina. Za diskretizaciju jednačina u kojima se konvektivni član piše u razvijenom obliku da bi se uzela u obzir prostorna promena poroznosti, koristi se računski postupak razdvajanja fluksova (flux-difference splitting) i prilagođena Rouova računska shema za aproksimaciju zavisno promenljivih na granicama kontrolne zapremine. Modifikovan Rouov postupak testiran je na pojednostavljenom, idealizovanom primeru homogenih DIDANS jednačina (horizontalno dno i zanemareni otpori trenja i oblika). Rezultati numeričkog modela upoređeni su sa analitičkim rešenjem za ovaj pojednostavljen slučaj, pri čemu je dobijeno odlično slaganje.
AB  - From the point of view of Engineering Hydraulics, the spatial distribution of the aquatic vegetation in the natural streams and their floodplanes is random and unrelated to the streams' flow characteristics. Aquatic vegetation enhances flow resistance and influences mixing and transport processes. Numerical simulation of open channel flows with variable spatial distribution of aquatic vegetation requires a special treatment of the advective terms, because, besides the main variables, they also contain the spatialy variable porosity due to the presence of vegetation in the channel. In this paper flow in open channels with variable spatial distribution of vegetation is described using triple-averaged Navier-Stokes equations (Depth-Integrated Double-Averaged Navier-Stokes, DIDANS equations). They are solved numerically using the finite volume method. The equations with the advective terms explicitly accounting for the spatial variation of porosity are solved by using the flux difference splitting and Roe's method for approximation of the dependent variables at the boundaries between the computational cells. The modified Roe's method is tested on an idealised case of homogeneous DIDANS equations (horizontal bed and all flow resistance terms neglected). Numerical results for this simplified case are in excellent agreement with the analytical solution.
PB  - Srpsko društvo za odvodnjavanje i navodnjavanje
T2  - Vodoprivreda
T1  - Numeričko modeliranje linijskih otvorenih tokova sa promenljivim rasporedom vegetacije
T1  - Numerical modelling of vegetated open-channel flows with arbitrary distribution of vegetation patches
EP  - 153
IS  - 325-326
SP  - 143
VL  - 55
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3339
ER  - 

@article{
author = "Đorđević, Dejana and Pokrajac, Dubravka",
year = "2023",
abstract = "Sa hidrauličkog stanovišta, prostorni raspored vodene vegetacije u koritima i na obalama vodotoka je slučajan i nezavisan od karakteristika toka. Vegetacija svojim prisustvom pruža otpore kretanju vode i utiče na tran-sportne procese i procese mešanja. Proračun otvorenih tokova sa promenljivim prostornim rasporedom vege-tacije zahteva da se prilikom numeričkog modeliranja vodi računa o konvektivnim članovima, jer oni pored zavisno promenljivih sadrže i prostorno promenljivu poroznost usled prisustva vegetacije u koritu. U ovom radu se za opis linijskih otvorenih tokova sa promenljivim rasporedom vegetacije koriste trostruko osrednjene Navije-Stoksove jednačine (Depth-Integrated Double-Averaged Navier-Stokes - DIDANS equations). Prikazan je postupak njihovog numeričkog rešavanja primenom metode konačnih zapremina. Za diskretizaciju jednačina u kojima se konvektivni član piše u razvijenom obliku da bi se uzela u obzir prostorna promena poroznosti, koristi se računski postupak razdvajanja fluksova (flux-difference splitting) i prilagođena Rouova računska shema za aproksimaciju zavisno promenljivih na granicama kontrolne zapremine. Modifikovan Rouov postupak testiran je na pojednostavljenom, idealizovanom primeru homogenih DIDANS jednačina (horizontalno dno i zanemareni otpori trenja i oblika). Rezultati numeričkog modela upoređeni su sa analitičkim rešenjem za ovaj pojednostavljen slučaj, pri čemu je dobijeno odlično slaganje., From the point of view of Engineering Hydraulics, the spatial distribution of the aquatic vegetation in the natural streams and their floodplanes is random and unrelated to the streams' flow characteristics. Aquatic vegetation enhances flow resistance and influences mixing and transport processes. Numerical simulation of open channel flows with variable spatial distribution of aquatic vegetation requires a special treatment of the advective terms, because, besides the main variables, they also contain the spatialy variable porosity due to the presence of vegetation in the channel. In this paper flow in open channels with variable spatial distribution of vegetation is described using triple-averaged Navier-Stokes equations (Depth-Integrated Double-Averaged Navier-Stokes, DIDANS equations). They are solved numerically using the finite volume method. The equations with the advective terms explicitly accounting for the spatial variation of porosity are solved by using the flux difference splitting and Roe's method for approximation of the dependent variables at the boundaries between the computational cells. The modified Roe's method is tested on an idealised case of homogeneous DIDANS equations (horizontal bed and all flow resistance terms neglected). Numerical results for this simplified case are in excellent agreement with the analytical solution.",
publisher = "Srpsko društvo za odvodnjavanje i navodnjavanje",
journal = "Vodoprivreda",
title = "Numeričko modeliranje linijskih otvorenih tokova sa promenljivim rasporedom vegetacije, Numerical modelling of vegetated open-channel flows with arbitrary distribution of vegetation patches",
pages = "153-143",
number = "325-326",
volume = "55",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3339"
}

Đorđević, D.,& Pokrajac, D.. (2023). Numeričko modeliranje linijskih otvorenih tokova sa promenljivim rasporedom vegetacije. in Vodoprivreda
Srpsko društvo za odvodnjavanje i navodnjavanje., 55(325-326), 143-153.
https://hdl.handle.net/21.15107/rcub_grafar_3339

Đorđević D, Pokrajac D. Numeričko modeliranje linijskih otvorenih tokova sa promenljivim rasporedom vegetacije. in Vodoprivreda. 2023;55(325-326):143-153.
https://hdl.handle.net/21.15107/rcub_grafar_3339 .

Đorđević, Dejana, Pokrajac, Dubravka, "Numeričko modeliranje linijskih otvorenih tokova sa promenljivim rasporedom vegetacije" in Vodoprivreda, 55, no. 325-326 (2023):143-153,
https://hdl.handle.net/21.15107/rcub_grafar_3339 .

TY  - JOUR
AU  - Praštalo, Petar
AU  - Đorđević, Dejana
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3338
AB  - Već trideset godina razmatraju se mogućnosti za poboljšanje metoda za procjenu krive protoka u slučajevima kada se voda izlije iz glavnog korita na plavne površine. Tradicionalne metode zasnovane na podjeli korita za veliku vodu na hidraulički homogene segmente i primjeni Maningove jednačine, vrijednost protoka precjenjuju za više od 60% [1]. Empirijske i fizički zasnovane metode koje su razvijene i unaprijeđene na osnovu mjerenja u laboratorijskim kanalima u uslovima ustaljenog jednolikog i nejednolikog tečenja pokazuju dobro slaganje sa mjerenjima. U ovom radu razmatraju se mogućnosti primjene empirijskog Ekersovog metoda i fizički zasnovanog metoda razmjene količine kretanja (MRKK), između glavnog korita i plavnih površina. Kao primjer primjene navedenih metoda koristi se profil hidrološke stanice Prijedor na rijeci Sani za koju postoje podaci osmatranja u domenu velikih voda. Vrijednosti protoka koje se dobiju na osnovu korišćenih metoda porede se sa vrijednostima sa krive protoka dobijena na osnovu terenskih mjerenja.
AB  - Possibilities for the improvement of the methods for the estimation of rating curves in compound channels in the range of overbank flows have been analysing for thirty years now. It was shown that traditional methods, which divide a compound channel into segments with uniform rougness and use Manning’s equation overestimate the discharge by more than 60%. Empirical and physically based methods that have been developed and improved based on the data collected in laboratory channels under the steady uniform and non-uniform flows show good agreement with new measurements. This paper discusses the possibilities of applying the empirical Ackers method, and the physically based exchange discharge model for the estimation of the overbank rating curve at the river gauging station. The Prijedor gauging station on the Sana River is used in this paper as an example. The choice is based on the availability of the measurement data of high flows. The discharge data obtained by the two methods are compared to the data from the official rating curve for the gauging station.
PB  - Srpsko društvo za odvodnjavanje i navodnjavanje
T2  - Vodoprivreda
T1  - Procjena krive protoka u neprizmatičnom korotu za veliku vodu po metodi Ekersa i metodi razmjene količine kretanja  – primjer rijeke Sane
T1  - Estimation of rating curve in non-prismatic compound channel using  Ackers method and exchange discharge model  – Sana River example –
EP  - 58
IS  - 321-322
SP  - 49
VL  - 55
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3338
ER  - 

@article{
author = "Praštalo, Petar and Đorđević, Dejana",
year = "2023",
abstract = "Već trideset godina razmatraju se mogućnosti za poboljšanje metoda za procjenu krive protoka u slučajevima kada se voda izlije iz glavnog korita na plavne površine. Tradicionalne metode zasnovane na podjeli korita za veliku vodu na hidraulički homogene segmente i primjeni Maningove jednačine, vrijednost protoka precjenjuju za više od 60% [1]. Empirijske i fizički zasnovane metode koje su razvijene i unaprijeđene na osnovu mjerenja u laboratorijskim kanalima u uslovima ustaljenog jednolikog i nejednolikog tečenja pokazuju dobro slaganje sa mjerenjima. U ovom radu razmatraju se mogućnosti primjene empirijskog Ekersovog metoda i fizički zasnovanog metoda razmjene količine kretanja (MRKK), između glavnog korita i plavnih površina. Kao primjer primjene navedenih metoda koristi se profil hidrološke stanice Prijedor na rijeci Sani za koju postoje podaci osmatranja u domenu velikih voda. Vrijednosti protoka koje se dobiju na osnovu korišćenih metoda porede se sa vrijednostima sa krive protoka dobijena na osnovu terenskih mjerenja., Possibilities for the improvement of the methods for the estimation of rating curves in compound channels in the range of overbank flows have been analysing for thirty years now. It was shown that traditional methods, which divide a compound channel into segments with uniform rougness and use Manning’s equation overestimate the discharge by more than 60%. Empirical and physically based methods that have been developed and improved based on the data collected in laboratory channels under the steady uniform and non-uniform flows show good agreement with new measurements. This paper discusses the possibilities of applying the empirical Ackers method, and the physically based exchange discharge model for the estimation of the overbank rating curve at the river gauging station. The Prijedor gauging station on the Sana River is used in this paper as an example. The choice is based on the availability of the measurement data of high flows. The discharge data obtained by the two methods are compared to the data from the official rating curve for the gauging station.",
publisher = "Srpsko društvo za odvodnjavanje i navodnjavanje",
journal = "Vodoprivreda",
title = "Procjena krive protoka u neprizmatičnom korotu za veliku vodu po metodi Ekersa i metodi razmjene količine kretanja  – primjer rijeke Sane, Estimation of rating curve in non-prismatic compound channel using  Ackers method and exchange discharge model  – Sana River example –",
pages = "58-49",
number = "321-322",
volume = "55",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3338"
}

Praštalo, P.,& Đorđević, D.. (2023). Procjena krive protoka u neprizmatičnom korotu za veliku vodu po metodi Ekersa i metodi razmjene količine kretanja  – primjer rijeke Sane. in Vodoprivreda
Srpsko društvo za odvodnjavanje i navodnjavanje., 55(321-322), 49-58.
https://hdl.handle.net/21.15107/rcub_grafar_3338

Praštalo P, Đorđević D. Procjena krive protoka u neprizmatičnom korotu za veliku vodu po metodi Ekersa i metodi razmjene količine kretanja  – primjer rijeke Sane. in Vodoprivreda. 2023;55(321-322):49-58.
https://hdl.handle.net/21.15107/rcub_grafar_3338 .

Praštalo, Petar, Đorđević, Dejana, "Procjena krive protoka u neprizmatičnom korotu za veliku vodu po metodi Ekersa i metodi razmjene količine kretanja  – primjer rijeke Sane" in Vodoprivreda, 55, no. 321-322 (2023):49-58,
https://hdl.handle.net/21.15107/rcub_grafar_3338 .

TY  - BOOK
AU  - Jovanović, Miodrag
AU  - Đorđević, Dejana
AU  - Rosić, Nikola
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3255
PB  - Univerzitet u Beogradu, Građevinski fakultet
T2  - Univerzitet u Beogradu, Građevinski fakultet
T1  - Plovni putevi i pristaništa kroz rešene primere
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3255
ER  - 

@book{
author = "Jovanović, Miodrag and Đorđević, Dejana and Rosić, Nikola",
year = "2023",
publisher = "Univerzitet u Beogradu, Građevinski fakultet",
journal = "Univerzitet u Beogradu, Građevinski fakultet",
title = "Plovni putevi i pristaništa kroz rešene primere",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3255"
}

Jovanović, M., Đorđević, D.,& Rosić, N.. (2023). Plovni putevi i pristaništa kroz rešene primere. in Univerzitet u Beogradu, Građevinski fakultet
Univerzitet u Beogradu, Građevinski fakultet..
https://hdl.handle.net/21.15107/rcub_grafar_3255

Jovanović M, Đorđević D, Rosić N. Plovni putevi i pristaništa kroz rešene primere. in Univerzitet u Beogradu, Građevinski fakultet. 2023;.
https://hdl.handle.net/21.15107/rcub_grafar_3255 .

Jovanović, Miodrag, Đorđević, Dejana, Rosić, Nikola, "Plovni putevi i pristaništa kroz rešene primere" in Univerzitet u Beogradu, Građevinski fakultet (2023),
https://hdl.handle.net/21.15107/rcub_grafar_3255 .

TY  - JOUR
AU  - Đorđević, Dejana
AU  - Tamás, Enikő Anna
AU  - Mihajlović, Ljubiša
AU  - Abonyi, Csaba
AU  - Vujanović, Aleksandar
AU  - Kalocsa, Béla
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3191
AB  - The subject of this study is an approximately 300 km long Middle Danube River reach that
spans from river kilometer (rkm) 1581 in Hungary to (rkm) 1255 in Serbia. The observed drying of
floodplains in Hungary some thirty years ago initiated the hydrological studies. However, problems
related to the navigation route maintenance of the Danube River and those in the water supply of
irrigation and drainage canal networks are now present in the whole free-flowing middle Danube
region. The study aims at investigating the correlation between the observed water level decrease
and recorded incision of the river bed at gauging stations and the indirect estimation of the long-term sediment transport along the sand-bed reach based on the surveillance cross-sections’ data
collected during regular monitoring surveys on the navigable Danube. It starts with hydrological
analyses of the 70-year-long time series of water level and discharge yearly data and continues
with morphological and correlation studies. It ends with the estimation of sediment transport. The
decreasing trend in water levels and the increasing trend in cross-sectional areas are persistent. There is a linear correlation between the two. Longitudinal changes in sediment transport indicate the existence of both degrading and aggrading riverbed reaches.
PB  - MDPI
T2  - Applied Sciences, MDPI, Special Issue: Sediment Transport
T1  - Estimation of Changes in Sediment Transport along the Free-Flowing Middle Danube River Reach
IS  - Special Issue: Sediment Transport
SP  - 10513
VL  - 13
DO  - 10.3390/app131810513
ER  - 

@article{
author = "Đorđević, Dejana and Tamás, Enikő Anna and Mihajlović, Ljubiša and Abonyi, Csaba and Vujanović, Aleksandar and Kalocsa, Béla",
year = "2023",
abstract = "The subject of this study is an approximately 300 km long Middle Danube River reach that
spans from river kilometer (rkm) 1581 in Hungary to (rkm) 1255 in Serbia. The observed drying of
floodplains in Hungary some thirty years ago initiated the hydrological studies. However, problems
related to the navigation route maintenance of the Danube River and those in the water supply of
irrigation and drainage canal networks are now present in the whole free-flowing middle Danube
region. The study aims at investigating the correlation between the observed water level decrease
and recorded incision of the river bed at gauging stations and the indirect estimation of the long-term sediment transport along the sand-bed reach based on the surveillance cross-sections’ data
collected during regular monitoring surveys on the navigable Danube. It starts with hydrological
analyses of the 70-year-long time series of water level and discharge yearly data and continues
with morphological and correlation studies. It ends with the estimation of sediment transport. The
decreasing trend in water levels and the increasing trend in cross-sectional areas are persistent. There is a linear correlation between the two. Longitudinal changes in sediment transport indicate the existence of both degrading and aggrading riverbed reaches.",
publisher = "MDPI",
journal = "Applied Sciences, MDPI, Special Issue: Sediment Transport",
title = "Estimation of Changes in Sediment Transport along the Free-Flowing Middle Danube River Reach",
number = "Special Issue: Sediment Transport",
pages = "10513",
volume = "13",
doi = "10.3390/app131810513"
}

Đorđević, D., Tamás, E. A., Mihajlović, L., Abonyi, C., Vujanović, A.,& Kalocsa, B.. (2023). Estimation of Changes in Sediment Transport along the Free-Flowing Middle Danube River Reach. in Applied Sciences, MDPI, Special Issue: Sediment Transport
MDPI., 13(Special Issue: Sediment Transport), 10513.
https://doi.org/10.3390/app131810513

Đorđević D, Tamás EA, Mihajlović L, Abonyi C, Vujanović A, Kalocsa B. Estimation of Changes in Sediment Transport along the Free-Flowing Middle Danube River Reach. in Applied Sciences, MDPI, Special Issue: Sediment Transport. 2023;13(Special Issue: Sediment Transport):10513.
doi:10.3390/app131810513 .

Đorđević, Dejana, Tamás, Enikő Anna, Mihajlović, Ljubiša, Abonyi, Csaba, Vujanović, Aleksandar, Kalocsa, Béla, "Estimation of Changes in Sediment Transport along the Free-Flowing Middle Danube River Reach" in Applied Sciences, MDPI, Special Issue: Sediment Transport, 13, no. Special Issue: Sediment Transport (2023):10513,
https://doi.org/10.3390/app131810513 . .

TY  - GEN
AU  - Lucca, E.
AU  - Avellán, T.
AU  - Kofinas, D.
AU  - Baganz, G. F. M.
AU  - Baubekova, A.
AU  - Blicharska, M.
AU  - Calheiros, C.
AU  - Castelli, G.
AU  - Dašić, T.
AU  - Đorđević, D.
AU  - el Jeitany, J.
AU  - Fader, M.
AU  - Hassan, R.
AU  - Kleemann, J.
AU  - Liu, H.-Y.
AU  - Masia, S.
AU  - Merheb, M.
AU  - Milliken, S.
AU  - Mooren, C. E.
AU  - Oinonen, S.
AU  - Oral, H. V.
AU  - Pagano, A.
AU  - Pineda-Martos, R.
AU  - Psomas, A.
AU  - Rađenović, T.
AU  - Das, S. S.
AU  - Sambo, B.
AU  - Sperotto, A.
AU  - Spyropoulou, A.
AU  - Stefanakis, A.
AU  - Suškevičs, M.
AU  - Sušnik, J.
AU  - Taiwo Temitope, B.
AU  - Teutschbein, C.
AU  - Vasilić, V.
AU  - Munaretto, S.
AU  - Brouwer, F.
AU  - Laspidou, C.
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3179
AB  - Integrated approaches for managing natural resources are needed to meet the increasing demand for freshwater, energy and food, while, in parallel, mitigating and adapting to climate change, maintaining the integrity of ecosystems, and ensuring equitable access to resources. The Water-Energy-Food (WEF) Nexus has been proposed as a cross-sectoral approach to understand, analyse, and manage the complex trade-offs and exploit synergies that arise among these resource sectors. Although not initially included as a component of the Nexus, the importance of ecosystems in supporting water, energy and food security is increasingly recognised by the Nexus community of researchers and practitioners. However, attempts to conceptually integrate Ecosystems into the Nexus have yet to converge into a common framework. A group of natural resources management researchers, system thinkers and ecosystem services experts from the European network COST Action CA20138 NEXUSNET have compiled and investigated the various approaches for integrating ecosystems in the WEF Nexus. By combining literature analysis with interdisciplinary workshops – one of which was held in a hybrid format (in person and online) at the University of Oulu, Finland, in September 2022 – we reveal a multiplicity of concepts utilised to represent, partially or fully, ecosystems in the Nexus, namely “natural environment”, “ecosystem services” and “biodiversity”. Disparity was also found in the role attributed to ecosystems in the Nexus framework, being it an underlying layer from which resources for Nexus sectors are extracted or the pillar of an expanded Nexus system – i.e., the WEF-Ecosystems Nexus. Through this collaborative effort, we present possible advantages and disadvantages of adopting differential  WEF-Ecosystems Nexus approaches, highlighting their potential complementarity and integration to support future advancement of Nexus research. In the oral presentation, we will show our preliminary findings and encourage the exchange of ideas and feedback from the different scientific disciplines present at the CEMEPE Conference.
T1  - Incorporating Ecosystems in the Water-Energy-Food Nexus: Current Perspective and Future Directions
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3179
ER  - 

@misc{
author = "Lucca, E. and Avellán, T. and Kofinas, D. and Baganz, G. F. M. and Baubekova, A. and Blicharska, M. and Calheiros, C. and Castelli, G. and Dašić, T. and Đorđević, D. and el Jeitany, J. and Fader, M. and Hassan, R. and Kleemann, J. and Liu, H.-Y. and Masia, S. and Merheb, M. and Milliken, S. and Mooren, C. E. and Oinonen, S. and Oral, H. V. and Pagano, A. and Pineda-Martos, R. and Psomas, A. and Rađenović, T. and Das, S. S. and Sambo, B. and Sperotto, A. and Spyropoulou, A. and Stefanakis, A. and Suškevičs, M. and Sušnik, J. and Taiwo Temitope, B. and Teutschbein, C. and Vasilić, V. and Munaretto, S. and Brouwer, F. and Laspidou, C.",
year = "2023",
abstract = "Integrated approaches for managing natural resources are needed to meet the increasing demand for freshwater, energy and food, while, in parallel, mitigating and adapting to climate change, maintaining the integrity of ecosystems, and ensuring equitable access to resources. The Water-Energy-Food (WEF) Nexus has been proposed as a cross-sectoral approach to understand, analyse, and manage the complex trade-offs and exploit synergies that arise among these resource sectors. Although not initially included as a component of the Nexus, the importance of ecosystems in supporting water, energy and food security is increasingly recognised by the Nexus community of researchers and practitioners. However, attempts to conceptually integrate Ecosystems into the Nexus have yet to converge into a common framework. A group of natural resources management researchers, system thinkers and ecosystem services experts from the European network COST Action CA20138 NEXUSNET have compiled and investigated the various approaches for integrating ecosystems in the WEF Nexus. By combining literature analysis with interdisciplinary workshops – one of which was held in a hybrid format (in person and online) at the University of Oulu, Finland, in September 2022 – we reveal a multiplicity of concepts utilised to represent, partially or fully, ecosystems in the Nexus, namely “natural environment”, “ecosystem services” and “biodiversity”. Disparity was also found in the role attributed to ecosystems in the Nexus framework, being it an underlying layer from which resources for Nexus sectors are extracted or the pillar of an expanded Nexus system – i.e., the WEF-Ecosystems Nexus. Through this collaborative effort, we present possible advantages and disadvantages of adopting differential  WEF-Ecosystems Nexus approaches, highlighting their potential complementarity and integration to support future advancement of Nexus research. In the oral presentation, we will show our preliminary findings and encourage the exchange of ideas and feedback from the different scientific disciplines present at the CEMEPE Conference.",
title = "Incorporating Ecosystems in the Water-Energy-Food Nexus: Current Perspective and Future Directions",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3179"
}

Lucca, E., Avellán, T., Kofinas, D., Baganz, G. F. M., Baubekova, A., Blicharska, M., Calheiros, C., Castelli, G., Dašić, T., Đorđević, D., el Jeitany, J., Fader, M., Hassan, R., Kleemann, J., Liu, H.-Y., Masia, S., Merheb, M., Milliken, S., Mooren, C. E., Oinonen, S., Oral, H. V., Pagano, A., Pineda-Martos, R., Psomas, A., Rađenović, T., Das, S. S., Sambo, B., Sperotto, A., Spyropoulou, A., Stefanakis, A., Suškevičs, M., Sušnik, J., Taiwo Temitope, B., Teutschbein, C., Vasilić, V., Munaretto, S., Brouwer, F.,& Laspidou, C.. (2023). Incorporating Ecosystems in the Water-Energy-Food Nexus: Current Perspective and Future Directions. .
https://hdl.handle.net/21.15107/rcub_grafar_3179

Lucca E, Avellán T, Kofinas D, Baganz GFM, Baubekova A, Blicharska M, Calheiros C, Castelli G, Dašić T, Đorđević D, el Jeitany J, Fader M, Hassan R, Kleemann J, Liu H, Masia S, Merheb M, Milliken S, Mooren CE, Oinonen S, Oral HV, Pagano A, Pineda-Martos R, Psomas A, Rađenović T, Das SS, Sambo B, Sperotto A, Spyropoulou A, Stefanakis A, Suškevičs M, Sušnik J, Taiwo Temitope B, Teutschbein C, Vasilić V, Munaretto S, Brouwer F, Laspidou C. Incorporating Ecosystems in the Water-Energy-Food Nexus: Current Perspective and Future Directions. 2023;.
https://hdl.handle.net/21.15107/rcub_grafar_3179 .

Lucca, E., Avellán, T., Kofinas, D., Baganz, G. F. M., Baubekova, A., Blicharska, M., Calheiros, C., Castelli, G., Dašić, T., Đorđević, D., el Jeitany, J., Fader, M., Hassan, R., Kleemann, J., Liu, H.-Y., Masia, S., Merheb, M., Milliken, S., Mooren, C. E., Oinonen, S., Oral, H. V., Pagano, A., Pineda-Martos, R., Psomas, A., Rađenović, T., Das, S. S., Sambo, B., Sperotto, A., Spyropoulou, A., Stefanakis, A., Suškevičs, M., Sušnik, J., Taiwo Temitope, B., Teutschbein, C., Vasilić, V., Munaretto, S., Brouwer, F., Laspidou, C., "Incorporating Ecosystems in the Water-Energy-Food Nexus: Current Perspective and Future Directions" (2023),
https://hdl.handle.net/21.15107/rcub_grafar_3179 .

TY  - CHAP
AU  - Rajaković-Ognjanović, Vladana
AU  - Đorđević, Dejana
AU  - Kuzmanović, Vladan
AU  - Despotović, Jovan
PY  - 2022
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2931
AB  - Летећи пепео (ЛП) је нуспроизвод сагоревања чврстих горива. У уводном делу рада дат је осврт на настанак (порекло), хемијски састав и класификацију летећег пепела. ЛП je прашкаста, чврста супстанца чији хемијски састав чини несагорели угљеник, метални оксиди (Si, Fe, Ca и Al) и друге неорганске супстанце. Структурна анализа сировог и модификованог узорка ЛП даје смернице ка потенцијалној промени ЛП. У другом делу рада наведене су и описане области примене ЛП. Примена ЛП налази своје место: у синтези зеолита, у индустрији керамике, у пречишћавању отпадних вода, у сорпционим материјалима. Летећи пепео има потенцијалну примену за  побољшање деградираног земљишта, а. користи се и као замена за сировину у грађевинској индустрији или као адитив у индустрији цемента. Летећи пепео је, због повољних геомеханичких и геотехничких карактеристика, нашао примену и у изградњи насипа. Такође, летећи пепео се користи за изградњу брана од ваљаног бетона. У Србији се данас ЛП користи за ободне насипе на депонијама 
пепела.
AB  - Fly ash (FА) is a by-product of solid fuels burning. In the introductory part of the paper, an overview of the origin, chemical composition and classification of fly ash is given. FА is a powdery, solid substance whose chemical composition consists of unburnt carbon, metal oxides (Si, Fe, Ca and Al) and other inorganic substances. Structural analysis of the raw and modified FА sample provides guidance towards potential FА change. In the second part of the paper, the areas of FА application are listed and described. The application of fly ash finds its place: in the synthesis of zeolites, in the ceramics industry, in the purification of wastewater and in sorption materials. Fly ash has potential applications for improving degraded soils. Fly ash is used as a substitute for raw material in the construction industry or as an additive in the cement industry. Due to favourable geomechanical and geotechnical characteristics, FA has also found application in the construction 
of embankments. Fly ash is also used for Roller Compacted Concrete Dams. In Serbia, FA is used for containment embankments at ash impoundments of Thermal Power Plants.
PB  - Универзитет у Београду - Грађевински факултет
T2  - Materijali i konstrukcije u savremenom građevinarstvu, monografija posvećena 85. rođendanu profesora Mihaila Muravljova
T1  - Летећи пепео - карактеризација и  примена у хидротехници
T1  - Fly ash – characterization and application in hydrotechnics
EP  - 128
SP  - 119
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2931
ER  - 

@inbook{
author = "Rajaković-Ognjanović, Vladana and Đorđević, Dejana and Kuzmanović, Vladan and Despotović, Jovan",
year = "2022",
abstract = "Летећи пепео (ЛП) је нуспроизвод сагоревања чврстих горива. У уводном делу рада дат је осврт на настанак (порекло), хемијски састав и класификацију летећег пепела. ЛП je прашкаста, чврста супстанца чији хемијски састав чини несагорели угљеник, метални оксиди (Si, Fe, Ca и Al) и друге неорганске супстанце. Структурна анализа сировог и модификованог узорка ЛП даје смернице ка потенцијалној промени ЛП. У другом делу рада наведене су и описане области примене ЛП. Примена ЛП налази своје место: у синтези зеолита, у индустрији керамике, у пречишћавању отпадних вода, у сорпционим материјалима. Летећи пепео има потенцијалну примену за  побољшање деградираног земљишта, а. користи се и као замена за сировину у грађевинској индустрији или као адитив у индустрији цемента. Летећи пепео је, због повољних геомеханичких и геотехничких карактеристика, нашао примену и у изградњи насипа. Такође, летећи пепео се користи за изградњу брана од ваљаног бетона. У Србији се данас ЛП користи за ободне насипе на депонијама 
пепела., Fly ash (FА) is a by-product of solid fuels burning. In the introductory part of the paper, an overview of the origin, chemical composition and classification of fly ash is given. FА is a powdery, solid substance whose chemical composition consists of unburnt carbon, metal oxides (Si, Fe, Ca and Al) and other inorganic substances. Structural analysis of the raw and modified FА sample provides guidance towards potential FА change. In the second part of the paper, the areas of FА application are listed and described. The application of fly ash finds its place: in the synthesis of zeolites, in the ceramics industry, in the purification of wastewater and in sorption materials. Fly ash has potential applications for improving degraded soils. Fly ash is used as a substitute for raw material in the construction industry or as an additive in the cement industry. Due to favourable geomechanical and geotechnical characteristics, FA has also found application in the construction 
of embankments. Fly ash is also used for Roller Compacted Concrete Dams. In Serbia, FA is used for containment embankments at ash impoundments of Thermal Power Plants.",
publisher = "Универзитет у Београду - Грађевински факултет",
journal = "Materijali i konstrukcije u savremenom građevinarstvu, monografija posvećena 85. rođendanu profesora Mihaila Muravljova",
booktitle = "Летећи пепео - карактеризација и  примена у хидротехници, Fly ash – characterization and application in hydrotechnics",
pages = "128-119",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2931"
}

Rajaković-Ognjanović, V., Đorđević, D., Kuzmanović, V.,& Despotović, J.. (2022). Летећи пепео - карактеризација и  примена у хидротехници. in Materijali i konstrukcije u savremenom građevinarstvu, monografija posvećena 85. rođendanu profesora Mihaila Muravljova
Универзитет у Београду - Грађевински факултет., 119-128.
https://hdl.handle.net/21.15107/rcub_grafar_2931

Rajaković-Ognjanović V, Đorđević D, Kuzmanović V, Despotović J. Летећи пепео - карактеризација и  примена у хидротехници. in Materijali i konstrukcije u savremenom građevinarstvu, monografija posvećena 85. rođendanu profesora Mihaila Muravljova. 2022;:119-128.
https://hdl.handle.net/21.15107/rcub_grafar_2931 .

Rajaković-Ognjanović, Vladana, Đorđević, Dejana, Kuzmanović, Vladan, Despotović, Jovan, "Летећи пепео - карактеризација и  примена у хидротехници" in Materijali i konstrukcije u savremenom građevinarstvu, monografija posvećena 85. rođendanu profesora Mihaila Muravljova (2022):119-128,
https://hdl.handle.net/21.15107/rcub_grafar_2931 .

TY  - CONF
AU  - Kimura, Ichiro
AU  - Bousmar, Didier
AU  - Archambeau, Pierre
AU  - Dewals, Benjamin
AU  - Erpicum, Sebastien
AU  - Pirotton, Michel
AU  - Li, X.
AU  - Đorđević, Dejana
AU  - Rosić, Nikola
AU  - Zindović, Budo
AU  - Echeverribar, Isabel
AU  - Navas-Montilla, Adrian
AU  - Brufau, P.
AU  - Garcia-Navarro, Pilar
AU  - Gonzales de Linares, Matthieu
AU  - Paquier, Andre
AU  - Kopmann, Rebekka
PY  - 2022
UR  - https://queensuca-my.sharepoint.com/:b:/r/personal/amsilva_queensu_ca/Documents/River%20Flow%202022_Papers1/Day%201_AM%20(Morning)/Session_A1/Kimura_A009.pdf?csf=1&web=1&e=5j9MEx
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2942
AB  - The benchmarking test of 2D and 3D numerical models on a compound channel flow with a rectangular-shaped main channel and a rectangular-shaped floodplain was carried out by the IAHR Working Group on Compound Channels. The selected test case is the flume experiment by Nezu and Tominaga (1991). Nine depth-averaged 2D models and four 3D models participated in the benchmark. In the 2D models, the depth-averaged streamwise velocity profiles in the lateral direction were compared. In the 3D models, velocity components in three directions as well as the distribution of the turbulence kinetic energy in a cross-section were compared. Through the comparison, the applicability and limitations of each model are highlighted and discussed with regard to the model characteristics.
PB  - Queen’s University, Canada
C3  - Proceedings of 11th International Conference on Fluvial Hydraulics - River Flow 2022 (on-line)
T1  - Flow structure in a compound channel: benchmarking 2D and 3D numerical models
SP  - A009
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2942
ER  - 

@conference{
author = "Kimura, Ichiro and Bousmar, Didier and Archambeau, Pierre and Dewals, Benjamin and Erpicum, Sebastien and Pirotton, Michel and Li, X. and Đorđević, Dejana and Rosić, Nikola and Zindović, Budo and Echeverribar, Isabel and Navas-Montilla, Adrian and Brufau, P. and Garcia-Navarro, Pilar and Gonzales de Linares, Matthieu and Paquier, Andre and Kopmann, Rebekka",
year = "2022",
abstract = "The benchmarking test of 2D and 3D numerical models on a compound channel flow with a rectangular-shaped main channel and a rectangular-shaped floodplain was carried out by the IAHR Working Group on Compound Channels. The selected test case is the flume experiment by Nezu and Tominaga (1991). Nine depth-averaged 2D models and four 3D models participated in the benchmark. In the 2D models, the depth-averaged streamwise velocity profiles in the lateral direction were compared. In the 3D models, velocity components in three directions as well as the distribution of the turbulence kinetic energy in a cross-section were compared. Through the comparison, the applicability and limitations of each model are highlighted and discussed with regard to the model characteristics.",
publisher = "Queen’s University, Canada",
journal = "Proceedings of 11th International Conference on Fluvial Hydraulics - River Flow 2022 (on-line)",
title = "Flow structure in a compound channel: benchmarking 2D and 3D numerical models",
pages = "A009",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2942"
}

Kimura, I., Bousmar, D., Archambeau, P., Dewals, B., Erpicum, S., Pirotton, M., Li, X., Đorđević, D., Rosić, N., Zindović, B., Echeverribar, I., Navas-Montilla, A., Brufau, P., Garcia-Navarro, P., Gonzales de Linares, M., Paquier, A.,& Kopmann, R.. (2022). Flow structure in a compound channel: benchmarking 2D and 3D numerical models. in Proceedings of 11th International Conference on Fluvial Hydraulics - River Flow 2022 (on-line)
Queen’s University, Canada., A009.
https://hdl.handle.net/21.15107/rcub_grafar_2942

Kimura I, Bousmar D, Archambeau P, Dewals B, Erpicum S, Pirotton M, Li X, Đorđević D, Rosić N, Zindović B, Echeverribar I, Navas-Montilla A, Brufau P, Garcia-Navarro P, Gonzales de Linares M, Paquier A, Kopmann R. Flow structure in a compound channel: benchmarking 2D and 3D numerical models. in Proceedings of 11th International Conference on Fluvial Hydraulics - River Flow 2022 (on-line). 2022;:A009.
https://hdl.handle.net/21.15107/rcub_grafar_2942 .

Kimura, Ichiro, Bousmar, Didier, Archambeau, Pierre, Dewals, Benjamin, Erpicum, Sebastien, Pirotton, Michel, Li, X., Đorđević, Dejana, Rosić, Nikola, Zindović, Budo, Echeverribar, Isabel, Navas-Montilla, Adrian, Brufau, P., Garcia-Navarro, Pilar, Gonzales de Linares, Matthieu, Paquier, Andre, Kopmann, Rebekka, "Flow structure in a compound channel: benchmarking 2D and 3D numerical models" in Proceedings of 11th International Conference on Fluvial Hydraulics - River Flow 2022 (on-line) (2022):A009,
https://hdl.handle.net/21.15107/rcub_grafar_2942 .

TY  - CONF
AU  - Mihajlović, Ljubiša
AU  - Đorđević, Dejana
AU  - Abonyi, Csaba
AU  - Tamás, Enikő Anna
PY  - 2022
UR  - https://www.erasmus.gr/microsites/1227/book-of-abstracts
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2930
AB  - This work is a continuation of works by Goda et al. (2007) and Tamás et al. (2021) that were prompted by the drying of floodplains and problems in the water supply of irrigation and drainage canal networks in the whole middle Danube region. Previous works focused on hydrology and showed a constant lowering of water levels, which indicated the deepening of the riverbed. In the present study, the relationship between indicators of morphological changes and the decrease in low water levels at gauging stations (GS) is sought. At this stage, results confirm a continuous deepening of the riverbed. Despite smaller correlation coefficient values between low water levels (Zmin) and percentage increase in the cross-sectional areas in the sand bed part of the investigated reach, the linear decreasing trend in Zmin is evident.
PB  - National Technical University of Athens
PB  - School of Civil Engineering, National Technical Univeristy of Athens
C3  - 7th IAHR Europe Congress - Abstract book
T1  - Relation of the observed water level decrease and morphological changes  of the river channel in the middle Danube
EP  - 71
SP  - 70
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2930
ER  - 

@conference{
author = "Mihajlović, Ljubiša and Đorđević, Dejana and Abonyi, Csaba and Tamás, Enikő Anna",
year = "2022",
abstract = "This work is a continuation of works by Goda et al. (2007) and Tamás et al. (2021) that were prompted by the drying of floodplains and problems in the water supply of irrigation and drainage canal networks in the whole middle Danube region. Previous works focused on hydrology and showed a constant lowering of water levels, which indicated the deepening of the riverbed. In the present study, the relationship between indicators of morphological changes and the decrease in low water levels at gauging stations (GS) is sought. At this stage, results confirm a continuous deepening of the riverbed. Despite smaller correlation coefficient values between low water levels (Zmin) and percentage increase in the cross-sectional areas in the sand bed part of the investigated reach, the linear decreasing trend in Zmin is evident.",
publisher = "National Technical University of Athens, School of Civil Engineering, National Technical Univeristy of Athens",
journal = "7th IAHR Europe Congress - Abstract book",
title = "Relation of the observed water level decrease and morphological changes  of the river channel in the middle Danube",
pages = "71-70",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2930"
}

Mihajlović, L., Đorđević, D., Abonyi, C.,& Tamás, E. A.. (2022). Relation of the observed water level decrease and morphological changes  of the river channel in the middle Danube. in 7th IAHR Europe Congress - Abstract book
National Technical University of Athens., 70-71.
https://hdl.handle.net/21.15107/rcub_grafar_2930

Mihajlović L, Đorđević D, Abonyi C, Tamás EA. Relation of the observed water level decrease and morphological changes  of the river channel in the middle Danube. in 7th IAHR Europe Congress - Abstract book. 2022;:70-71.
https://hdl.handle.net/21.15107/rcub_grafar_2930 .

Mihajlović, Ljubiša, Đorđević, Dejana, Abonyi, Csaba, Tamás, Enikő Anna, "Relation of the observed water level decrease and morphological changes  of the river channel in the middle Danube" in 7th IAHR Europe Congress - Abstract book (2022):70-71,
https://hdl.handle.net/21.15107/rcub_grafar_2930 .

TY  - JOUR
AU  - Ghobadian, Rasool
AU  - Đorđević, Dejana
AU  - Basiri, Masha
PY  - 2021
UR  - http://gf.ukim.edu.mk/wp-content/uploads/2017/12/SJCE-vol.-10.pdf
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2445
AB  - River bends are rarely simple, i.e., the bend radius is rarely constant throughout the bend length. They are rather irregular, i.e. their shape in the plan can be approximated with different bend radii. Since the bulk of previous research is concerned with simple bends, this paper aims at studying the effect of variable bend curvature on flow in an irregular bend with two bend radii. The effect is studied numerically, using a 3D finite volume based model SSIIM1, which solves Reynolds-Averaged Navier-Stokes (RANS) equations with two-equation turbulence model closure. After successful calibration against experimental data from the simple 180° bend, the model is used to simulate flow in 180° variable curvature bends with the following combinations of relative curvature: mild-mild, mild-sharp and sharp-mild. Results have shown that: (1) The maximum spanwise water surface slope always develops at the entrance to the sharp bend, (2) the greatest slope develops in the sharp-mild layout, (3) the location where the maximum velocity path cuts the bend centerline does not change with the bend layout (simple or variable curvature), (4) the bend curvature sequence affects lateral velocity distributions of the streamwise velocity only in the middle of the bend, (5) the relative curvature sequence has an adverse effect on the size of two regions with maximum bed shear stress – one around the curvature inflection point and the other close to the bend exit.
PB  - Faculty of Civil Engineering - Skopje
PB  - Градежен факултет – Скопје
T2  - Scientific Journal of Civil Engineering
T1  - Assessment of the impact of bend type on flow characteristics in 180° compound bends
EP  - 35
IS  - 1
SP  - 23
VL  - 10
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2445
ER  - 

@article{
author = "Ghobadian, Rasool and Đorđević, Dejana and Basiri, Masha",
year = "2021",
abstract = "River bends are rarely simple, i.e., the bend radius is rarely constant throughout the bend length. They are rather irregular, i.e. their shape in the plan can be approximated with different bend radii. Since the bulk of previous research is concerned with simple bends, this paper aims at studying the effect of variable bend curvature on flow in an irregular bend with two bend radii. The effect is studied numerically, using a 3D finite volume based model SSIIM1, which solves Reynolds-Averaged Navier-Stokes (RANS) equations with two-equation turbulence model closure. After successful calibration against experimental data from the simple 180° bend, the model is used to simulate flow in 180° variable curvature bends with the following combinations of relative curvature: mild-mild, mild-sharp and sharp-mild. Results have shown that: (1) The maximum spanwise water surface slope always develops at the entrance to the sharp bend, (2) the greatest slope develops in the sharp-mild layout, (3) the location where the maximum velocity path cuts the bend centerline does not change with the bend layout (simple or variable curvature), (4) the bend curvature sequence affects lateral velocity distributions of the streamwise velocity only in the middle of the bend, (5) the relative curvature sequence has an adverse effect on the size of two regions with maximum bed shear stress – one around the curvature inflection point and the other close to the bend exit.",
publisher = "Faculty of Civil Engineering - Skopje, Градежен факултет – Скопје",
journal = "Scientific Journal of Civil Engineering",
title = "Assessment of the impact of bend type on flow characteristics in 180° compound bends",
pages = "35-23",
number = "1",
volume = "10",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2445"
}

Ghobadian, R., Đorđević, D.,& Basiri, M.. (2021). Assessment of the impact of bend type on flow characteristics in 180° compound bends. in Scientific Journal of Civil Engineering
Faculty of Civil Engineering - Skopje., 10(1), 23-35.
https://hdl.handle.net/21.15107/rcub_grafar_2445

Ghobadian R, Đorđević D, Basiri M. Assessment of the impact of bend type on flow characteristics in 180° compound bends. in Scientific Journal of Civil Engineering. 2021;10(1):23-35.
https://hdl.handle.net/21.15107/rcub_grafar_2445 .

Ghobadian, Rasool, Đorđević, Dejana, Basiri, Masha, "Assessment of the impact of bend type on flow characteristics in 180° compound bends" in Scientific Journal of Civil Engineering, 10, no. 1 (2021):23-35,
https://hdl.handle.net/21.15107/rcub_grafar_2445 .

TY  - JOUR
AU  - Đorđević, Dejana
AU  - Erić, Ranka
AU  - Jaćimović, David
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2444
AB  - U ovom radu razmatra se svrsishodnost primene metode razmene količine kretanja za procenu krive protoka i rekonstrukciju talasa velikih voda u dubokim koritima za veliku vodu koja imaju uske plavne površine. Ovo pitanje nametnulo se tokom procene krive protoka na hidrološkoj stanici Ub korišćenjem zabeleženog nivograma velike vode iz maja 2014. godine i rekonstrukcije odgovarajućeg hidrograma. Na ovoj hidrološkoj stanici vrednost odnosa dubine korita za veliku vodu i njegove širine u dnu znatno je veća od uobičajenih vrednosti i iznosi 1,46 (uobičajene vrednosti su mnogo manje od 1), a širina berme sa stazom za šetanje na koju se izliva voda iz glavnog korita je 2,5 m. Pored toga, korito odlikuje neujednačena rapavost zbog korišćenja različitih materijala za obradu kinete glavnog korita, kosina i bermi. Sve ovo utiče na to da presek vrlo brzo nakon izlivanja postaje hidraulički homogen, sa praktično zanemarljivom razmenom količine kratanja između glavnog korita i plavnih površina, zbog čega se vrednosti protoka dobijene metodom razmene količine kretanja razlikuju za oko 10% od vrednosti dobijenih primenom tradicionalne metode jedinstvenog preseka. S obzirom na to da za konstrukciju nove krive protoka u domenu velikih voda RHMZ nije imao dovoljno podataka, jer je stanica rekonstruisana svega godinu dana pre ovog talasa velike vode, zvaničnu krivu protoka i sve zaključke ove analize treba preispitati kada na raspolaganju bude dovoljno podataka za pouzdaniju procenu i zaključke.
AB  - In this paper, the appropriateness of the exchange discharge method for the estimation of the stage-discharge curve and the reconstruction of the flood flow hydrograph in deep compound channels with narrow floodplains is discussed. This issue has been raised while estimating the stage-discharge curve at Ub gauging station based on the recorded stage hydrograph of the 2014 May flood and an attempt to reconstruct the corresponding flow hydrograph. The ratio of the depth 
of the compound channel to its bottom width takes a high value of 1.46 when compared to the usual values, which are far less than one. The berm width with the walking path where the overbank flow spills, is 2.5 m. Additionally, the compound channel is characterised by 
different surface covers which results in non-homogeneous roughness. Because of all these facts, the compound channel starts to behave as a single unit or a simple channel shortly after the initiation of the overbank flow, i.e. the momentum transfer between the main channel and the floodplain becomes negligible. Consequently, the discharge values calculated by the exchange discharge method differ by 10% from those calculated by the traditional, single-channel method.
Since the Republic Hydrometeorological Service of Serbia had no flood data from the re-established Ub gauging station for the estimation of the overbank stage-discharge curve, there is a high level of uncertainty in the official stage-discharge curve. Thus, both the curve and the conclusions derived from this analysis should be reconsidered once there is enough data for proper estimation of the curve and proper conclusions about the appropriateness of the exchange discharge model.
PB  - Srpsko društvo za odvodnjavanje i navodnjavanje
T2  - Vodoprivreda
T1  - Procena krive protoka i rekonstrukcija poplavnog talasa u dubokom koritu sa uskim plavnim površinama
T1  - Estimation of the stage-discharge curve and reconstruction of the flood hydrograph in a deep river channel with narrow floodplains
EP  - 74
IS  - 309-310
SP  - 65
VL  - 53
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2444
ER  - 

@article{
author = "Đorđević, Dejana and Erić, Ranka and Jaćimović, David",
year = "2021",
abstract = "U ovom radu razmatra se svrsishodnost primene metode razmene količine kretanja za procenu krive protoka i rekonstrukciju talasa velikih voda u dubokim koritima za veliku vodu koja imaju uske plavne površine. Ovo pitanje nametnulo se tokom procene krive protoka na hidrološkoj stanici Ub korišćenjem zabeleženog nivograma velike vode iz maja 2014. godine i rekonstrukcije odgovarajućeg hidrograma. Na ovoj hidrološkoj stanici vrednost odnosa dubine korita za veliku vodu i njegove širine u dnu znatno je veća od uobičajenih vrednosti i iznosi 1,46 (uobičajene vrednosti su mnogo manje od 1), a širina berme sa stazom za šetanje na koju se izliva voda iz glavnog korita je 2,5 m. Pored toga, korito odlikuje neujednačena rapavost zbog korišćenja različitih materijala za obradu kinete glavnog korita, kosina i bermi. Sve ovo utiče na to da presek vrlo brzo nakon izlivanja postaje hidraulički homogen, sa praktično zanemarljivom razmenom količine kratanja između glavnog korita i plavnih površina, zbog čega se vrednosti protoka dobijene metodom razmene količine kretanja razlikuju za oko 10% od vrednosti dobijenih primenom tradicionalne metode jedinstvenog preseka. S obzirom na to da za konstrukciju nove krive protoka u domenu velikih voda RHMZ nije imao dovoljno podataka, jer je stanica rekonstruisana svega godinu dana pre ovog talasa velike vode, zvaničnu krivu protoka i sve zaključke ove analize treba preispitati kada na raspolaganju bude dovoljno podataka za pouzdaniju procenu i zaključke., In this paper, the appropriateness of the exchange discharge method for the estimation of the stage-discharge curve and the reconstruction of the flood flow hydrograph in deep compound channels with narrow floodplains is discussed. This issue has been raised while estimating the stage-discharge curve at Ub gauging station based on the recorded stage hydrograph of the 2014 May flood and an attempt to reconstruct the corresponding flow hydrograph. The ratio of the depth 
of the compound channel to its bottom width takes a high value of 1.46 when compared to the usual values, which are far less than one. The berm width with the walking path where the overbank flow spills, is 2.5 m. Additionally, the compound channel is characterised by 
different surface covers which results in non-homogeneous roughness. Because of all these facts, the compound channel starts to behave as a single unit or a simple channel shortly after the initiation of the overbank flow, i.e. the momentum transfer between the main channel and the floodplain becomes negligible. Consequently, the discharge values calculated by the exchange discharge method differ by 10% from those calculated by the traditional, single-channel method.
Since the Republic Hydrometeorological Service of Serbia had no flood data from the re-established Ub gauging station for the estimation of the overbank stage-discharge curve, there is a high level of uncertainty in the official stage-discharge curve. Thus, both the curve and the conclusions derived from this analysis should be reconsidered once there is enough data for proper estimation of the curve and proper conclusions about the appropriateness of the exchange discharge model.",
publisher = "Srpsko društvo za odvodnjavanje i navodnjavanje",
journal = "Vodoprivreda",
title = "Procena krive protoka i rekonstrukcija poplavnog talasa u dubokom koritu sa uskim plavnim površinama, Estimation of the stage-discharge curve and reconstruction of the flood hydrograph in a deep river channel with narrow floodplains",
pages = "74-65",
number = "309-310",
volume = "53",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2444"
}

Đorđević, D., Erić, R.,& Jaćimović, D.. (2021). Procena krive protoka i rekonstrukcija poplavnog talasa u dubokom koritu sa uskim plavnim površinama. in Vodoprivreda
Srpsko društvo za odvodnjavanje i navodnjavanje., 53(309-310), 65-74.
https://hdl.handle.net/21.15107/rcub_grafar_2444

Đorđević D, Erić R, Jaćimović D. Procena krive protoka i rekonstrukcija poplavnog talasa u dubokom koritu sa uskim plavnim površinama. in Vodoprivreda. 2021;53(309-310):65-74.
https://hdl.handle.net/21.15107/rcub_grafar_2444 .

Đorđević, Dejana, Erić, Ranka, Jaćimović, David, "Procena krive protoka i rekonstrukcija poplavnog talasa u dubokom koritu sa uskim plavnim površinama" in Vodoprivreda, 53, no. 309-310 (2021):65-74,
https://hdl.handle.net/21.15107/rcub_grafar_2444 .

TY  - JOUR
AU  - Hosseini Mobara, Seyed Erfan
AU  - Ghobadian, Rasool
AU  - Rouzbahani, Fardin
AU  - Đorđević, Dejana
PY  - 2021
UR  - https://ezproxy.nb.rs:2134/content/pdf/10.1007/s10064-021-02163-z.pdf
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2448
AB  - Landslide phenomenon in accumulated erodible bed sediments in a reservoir is one of the issues in hydraulic and sedimentation sciences that has received little attention. We intend to model two-dimensional changes of the water surface in a reservoir and of an erodible bed caused by a non-rigid landslide using a particle-based meshless approach. In this study, a fully explicit three-step algorithm is used. In this method, approximate numerical solution to the equations of the fluid dynamics is obtained by replacing the fluid with a set of particles. The governing equations for water flow and sand mass movement are solved for each particle. The movement of each particle, which is in interaction with other particles, is tracked. Experiments of a dam break on a dry bed, and submarine rigid and non-rigid landslides have been used to validate the method. Results indicate that the model was successfully calibrated against the measured data. Moreover, good agreement with the measured data demonstrates high capabilities of this method in simulating free-surface flows and wave-related phenomena. After the model validation, changes of erodible bed in a reservoir due to a non-rigid landslide were modelled. In this study, non-rigid landslide masses and sediment materials were modelled by non-Newtonian Carreau-Yasuda fluid, which is the novelty in the analysis of this type of natural hazard. Two possible scenarios were analyzed—one with the sliding material lighter, and the other with the sliding material heavier than the deposited sediments. The model was run until the landslide completely collapsed and its full impact was applied to the reservoir bed sediments. Additionally, we waited until the water level reached a steady state. These examples demonstrate that the model presented in this paper can be used as a reliable tool for modelling these phenomena.
PB  - Springer
PB  - International Association for Engineering Geology and the Environment (IAEG)
T2  - Bulletin of Engineering Geology and the Environment
T1  - Numerical simulation of non-rigid landslide into reservoir with erodible sediment bed using SPH method
EP  - 4366
IS  - 6
SP  - 4347
VL  - 80
DO  - 10.1007/s10064-021-02163-z
ER  - 

@article{
author = "Hosseini Mobara, Seyed Erfan and Ghobadian, Rasool and Rouzbahani, Fardin and Đorđević, Dejana",
year = "2021",
abstract = "Landslide phenomenon in accumulated erodible bed sediments in a reservoir is one of the issues in hydraulic and sedimentation sciences that has received little attention. We intend to model two-dimensional changes of the water surface in a reservoir and of an erodible bed caused by a non-rigid landslide using a particle-based meshless approach. In this study, a fully explicit three-step algorithm is used. In this method, approximate numerical solution to the equations of the fluid dynamics is obtained by replacing the fluid with a set of particles. The governing equations for water flow and sand mass movement are solved for each particle. The movement of each particle, which is in interaction with other particles, is tracked. Experiments of a dam break on a dry bed, and submarine rigid and non-rigid landslides have been used to validate the method. Results indicate that the model was successfully calibrated against the measured data. Moreover, good agreement with the measured data demonstrates high capabilities of this method in simulating free-surface flows and wave-related phenomena. After the model validation, changes of erodible bed in a reservoir due to a non-rigid landslide were modelled. In this study, non-rigid landslide masses and sediment materials were modelled by non-Newtonian Carreau-Yasuda fluid, which is the novelty in the analysis of this type of natural hazard. Two possible scenarios were analyzed—one with the sliding material lighter, and the other with the sliding material heavier than the deposited sediments. The model was run until the landslide completely collapsed and its full impact was applied to the reservoir bed sediments. Additionally, we waited until the water level reached a steady state. These examples demonstrate that the model presented in this paper can be used as a reliable tool for modelling these phenomena.",
publisher = "Springer, International Association for Engineering Geology and the Environment (IAEG)",
journal = "Bulletin of Engineering Geology and the Environment",
title = "Numerical simulation of non-rigid landslide into reservoir with erodible sediment bed using SPH method",
pages = "4366-4347",
number = "6",
volume = "80",
doi = "10.1007/s10064-021-02163-z"
}

Hosseini Mobara, S. E., Ghobadian, R., Rouzbahani, F.,& Đorđević, D.. (2021). Numerical simulation of non-rigid landslide into reservoir with erodible sediment bed using SPH method. in Bulletin of Engineering Geology and the Environment
Springer., 80(6), 4347-4366.
https://doi.org/10.1007/s10064-021-02163-z

Hosseini Mobara SE, Ghobadian R, Rouzbahani F, Đorđević D. Numerical simulation of non-rigid landslide into reservoir with erodible sediment bed using SPH method. in Bulletin of Engineering Geology and the Environment. 2021;80(6):4347-4366.
doi:10.1007/s10064-021-02163-z .

Hosseini Mobara, Seyed Erfan, Ghobadian, Rasool, Rouzbahani, Fardin, Đorđević, Dejana, "Numerical simulation of non-rigid landslide into reservoir with erodible sediment bed using SPH method" in Bulletin of Engineering Geology and the Environment, 80, no. 6 (2021):4347-4366,
https://doi.org/10.1007/s10064-021-02163-z . .

TY  - JOUR
AU  - Hosseini Mobara, Seyed Erfan
AU  - Ghobadian, Rasool
AU  - Rouzbahani, Fardin
AU  - Đorđević, Dejana
PY  - 2021
UR  - https://www.sciencedirect.com/science/article/pii/S0955799721001545
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2449
AB  - Deformable landslide body is modeled as a rheological material when SPH methods are used for numerical simulations. To increase accuracy, Carreau-Yasuda rheological model is chosen in this study. The model overcomes the weakness of the power-law model in predicting viscosity at zero and infinite shear strain rates. Also, a fully explicit three-step algorithm is proposed to solve governing equations. In the first step, intermediate velocities are computed in the presence of body forces. In the second step , they are used to compute divergence of stress tensor and to find intermediate particle positions. In the third step, pressure gradient in the momentum equation is merged with the continuity equation, and final particle velocity is calculated at the end of the time step. The algorithm is used in combination with Carreau-Yasuda model to simulate submarine non-rigid landslide. Comparison with experimental data indicates good agreement between calculated and observed water surface elevations with very low L2 relative error norm(εL2) and RMSE values. They are up to 70% lower than those from previous studies when Cross and Bingham rheological models were used with ISPH and WCSPH models, respectively. Moreover, shape and advancement of the non-rigid body made of sand are well captured.
PB  - Elsevier
T2  - Engineering Analysis with Boundary Elements
T1  - Numerical simulation of Submarine non-rigid landslide by an explicit three-step incompressible smoothed particle hydrodynamics
EP  - 208
SP  - 196
VL  - 130
DO  - 10.1016/j.enganabound.2021.05.025
ER  - 

@article{
author = "Hosseini Mobara, Seyed Erfan and Ghobadian, Rasool and Rouzbahani, Fardin and Đorđević, Dejana",
year = "2021",
abstract = "Deformable landslide body is modeled as a rheological material when SPH methods are used for numerical simulations. To increase accuracy, Carreau-Yasuda rheological model is chosen in this study. The model overcomes the weakness of the power-law model in predicting viscosity at zero and infinite shear strain rates. Also, a fully explicit three-step algorithm is proposed to solve governing equations. In the first step, intermediate velocities are computed in the presence of body forces. In the second step , they are used to compute divergence of stress tensor and to find intermediate particle positions. In the third step, pressure gradient in the momentum equation is merged with the continuity equation, and final particle velocity is calculated at the end of the time step. The algorithm is used in combination with Carreau-Yasuda model to simulate submarine non-rigid landslide. Comparison with experimental data indicates good agreement between calculated and observed water surface elevations with very low L2 relative error norm(εL2) and RMSE values. They are up to 70% lower than those from previous studies when Cross and Bingham rheological models were used with ISPH and WCSPH models, respectively. Moreover, shape and advancement of the non-rigid body made of sand are well captured.",
publisher = "Elsevier",
journal = "Engineering Analysis with Boundary Elements",
title = "Numerical simulation of Submarine non-rigid landslide by an explicit three-step incompressible smoothed particle hydrodynamics",
pages = "208-196",
volume = "130",
doi = "10.1016/j.enganabound.2021.05.025"
}

Hosseini Mobara, S. E., Ghobadian, R., Rouzbahani, F.,& Đorđević, D.. (2021). Numerical simulation of Submarine non-rigid landslide by an explicit three-step incompressible smoothed particle hydrodynamics. in Engineering Analysis with Boundary Elements
Elsevier., 130, 196-208.
https://doi.org/10.1016/j.enganabound.2021.05.025

Hosseini Mobara SE, Ghobadian R, Rouzbahani F, Đorđević D. Numerical simulation of Submarine non-rigid landslide by an explicit three-step incompressible smoothed particle hydrodynamics. in Engineering Analysis with Boundary Elements. 2021;130:196-208.
doi:10.1016/j.enganabound.2021.05.025 .

Hosseini Mobara, Seyed Erfan, Ghobadian, Rasool, Rouzbahani, Fardin, Đorđević, Dejana, "Numerical simulation of Submarine non-rigid landslide by an explicit three-step incompressible smoothed particle hydrodynamics" in Engineering Analysis with Boundary Elements, 130 (2021):196-208,
https://doi.org/10.1016/j.enganabound.2021.05.025 . .

TY  - JOUR
AU  - Hosseini Mobara, Seyed Erfan
AU  - Ghobadian, Rasool
AU  - Rouzbahani, Fardin
AU  - Đorđević, Dejana
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2450
AB  - Many landslides in nature may be classified as deformable landslides. The landslide volume is usually modeled as a rheological material when SPH methods are used for landslide simulation, since these methods allow for the use of particles with different fluid properties. To increase the accuracy, the Carreau-Yasuda model is chosen in this study to predict the behavior of the rheological material. This rheological model overcomes the weakness of the power-law model in predicting the viscosity at zero and infinite shear strain rates. Also, a fully explicit three-step algorithm is proposed to solve the governing equations. In the first step, the momentum equation is solved in the presence of the body forces while neglecting all other forces. In this step intermediate velocity values are computed. In the second step, the calculated intermediate velocities are employed to compute divergence of the stress tensor, and velocity components of each particle are updated to find their intermediate positions. These two steps are called predictor steps. In the third, corrector step, the pressure gradient in the momentum equation is merged with the continuity equation, and lastly the final particle velocity is calculated at the end of the time step. The fully explicit three-step algorithm is used in combination with Carreau-Yasuda model to simulate the submarine non-rigid landslide from the physical model. The comparison with the experimental data indicates good agreement between the calculated and observed water surface elevations with very low L2 relative error norm (L2) and RMSE values that are up to 70% lower than those from previous studies when Cross and Bingham rheological models were used with ISPH and WCSPH models, respectively. Moreover, the shape and the advancement of the non-rigid body made of sand are captured equally good.
PB  - Elsevier
T2  - Engineering Analysis with Boundary Elements
T1  - Numerical simulation  of Submarine non-rigid landslide by an explicit three-step incompressible smoothed  particle hydrodynamics
EP  - 208
SP  - 196
VL  - 130
DO  - 10.1016/j.enganabound.2021.05.025
ER  - 

@article{
author = "Hosseini Mobara, Seyed Erfan and Ghobadian, Rasool and Rouzbahani, Fardin and Đorđević, Dejana",
year = "2021",
abstract = "Many landslides in nature may be classified as deformable landslides. The landslide volume is usually modeled as a rheological material when SPH methods are used for landslide simulation, since these methods allow for the use of particles with different fluid properties. To increase the accuracy, the Carreau-Yasuda model is chosen in this study to predict the behavior of the rheological material. This rheological model overcomes the weakness of the power-law model in predicting the viscosity at zero and infinite shear strain rates. Also, a fully explicit three-step algorithm is proposed to solve the governing equations. In the first step, the momentum equation is solved in the presence of the body forces while neglecting all other forces. In this step intermediate velocity values are computed. In the second step, the calculated intermediate velocities are employed to compute divergence of the stress tensor, and velocity components of each particle are updated to find their intermediate positions. These two steps are called predictor steps. In the third, corrector step, the pressure gradient in the momentum equation is merged with the continuity equation, and lastly the final particle velocity is calculated at the end of the time step. The fully explicit three-step algorithm is used in combination with Carreau-Yasuda model to simulate the submarine non-rigid landslide from the physical model. The comparison with the experimental data indicates good agreement between the calculated and observed water surface elevations with very low L2 relative error norm (L2) and RMSE values that are up to 70% lower than those from previous studies when Cross and Bingham rheological models were used with ISPH and WCSPH models, respectively. Moreover, the shape and the advancement of the non-rigid body made of sand are captured equally good.",
publisher = "Elsevier",
journal = "Engineering Analysis with Boundary Elements",
title = "Numerical simulation  of Submarine non-rigid landslide by an explicit three-step incompressible smoothed  particle hydrodynamics",
pages = "208-196",
volume = "130",
doi = "10.1016/j.enganabound.2021.05.025"
}

Hosseini Mobara, S. E., Ghobadian, R., Rouzbahani, F.,& Đorđević, D.. (2021). Numerical simulation  of Submarine non-rigid landslide by an explicit three-step incompressible smoothed  particle hydrodynamics. in Engineering Analysis with Boundary Elements
Elsevier., 130, 196-208.
https://doi.org/10.1016/j.enganabound.2021.05.025

Hosseini Mobara SE, Ghobadian R, Rouzbahani F, Đorđević D. Numerical simulation  of Submarine non-rigid landslide by an explicit three-step incompressible smoothed  particle hydrodynamics. in Engineering Analysis with Boundary Elements. 2021;130:196-208.
doi:10.1016/j.enganabound.2021.05.025 .

Hosseini Mobara, Seyed Erfan, Ghobadian, Rasool, Rouzbahani, Fardin, Đorđević, Dejana, "Numerical simulation  of Submarine non-rigid landslide by an explicit three-step incompressible smoothed  particle hydrodynamics" in Engineering Analysis with Boundary Elements, 130 (2021):196-208,
https://doi.org/10.1016/j.enganabound.2021.05.025 . .

TY  - CONF
AU  - Tamás, Enikö Ana
AU  - Đorđević, Dejana
AU  - Kalocsa, Béla
AU  - Vujanović, Aleksandar
PY  - 2021
UR  - https://edoc.ku.de/id/eprint/28094/
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2446
AB  - Hydrological regime plays a primary role in the sustainable management of floodplains, as floodplain ecosystem dynamics and balance are largely dependent on the dynamics of the flow regime of rivers. In the 1980’s a drying process of floodplains on the lower Danube reach in Hungary became evident while in the 2000s continuous unimpeded water supply of the main canal network in the Danube-Tisza-Danube water supply and drainage canal system became an alarming problem. In view of these problems, the present analysis aims at: 1) recognising hydrological indicators of the incision and/or aggradation of the riverbed, 2) estimating the extent of these processes and the rate of change of the riverbed in time based on these indicators, as well as 3) estimating possible consequent changes in the frequency of extremities. The study has shown that the lateral connectivity is at risk along the whole reach as the deepening of the riverbed still continues and according to some parameters (e.g. the gradient of decrease of mean water levels) is even increasing.
PB  - Catholic University of Eichstätt-Ingolstadt
C3  - Proceedings of 43rd IAD Conference  Rivers and Floodplains in the  Anthropocene – Upcoming Challenges  in the Danube River Basin
T1  - Hydrological indicators of the riverbed incision along  the free-flowing Danube River reach from Budapest to  Slankamen relevant for the lateral connectivity  between the river channel and floodplains
EP  - 69
SP  - 62
VL  - 43
DO  - https://doi.org/10.17904/ku.edoc.28094
ER  - 

@conference{
author = "Tamás, Enikö Ana and Đorđević, Dejana and Kalocsa, Béla and Vujanović, Aleksandar",
year = "2021",
abstract = "Hydrological regime plays a primary role in the sustainable management of floodplains, as floodplain ecosystem dynamics and balance are largely dependent on the dynamics of the flow regime of rivers. In the 1980’s a drying process of floodplains on the lower Danube reach in Hungary became evident while in the 2000s continuous unimpeded water supply of the main canal network in the Danube-Tisza-Danube water supply and drainage canal system became an alarming problem. In view of these problems, the present analysis aims at: 1) recognising hydrological indicators of the incision and/or aggradation of the riverbed, 2) estimating the extent of these processes and the rate of change of the riverbed in time based on these indicators, as well as 3) estimating possible consequent changes in the frequency of extremities. The study has shown that the lateral connectivity is at risk along the whole reach as the deepening of the riverbed still continues and according to some parameters (e.g. the gradient of decrease of mean water levels) is even increasing.",
publisher = "Catholic University of Eichstätt-Ingolstadt",
journal = "Proceedings of 43rd IAD Conference  Rivers and Floodplains in the  Anthropocene – Upcoming Challenges  in the Danube River Basin",
title = "Hydrological indicators of the riverbed incision along  the free-flowing Danube River reach from Budapest to  Slankamen relevant for the lateral connectivity  between the river channel and floodplains",
pages = "69-62",
volume = "43",
doi = "https://doi.org/10.17904/ku.edoc.28094"
}

Tamás, E. A., Đorđević, D., Kalocsa, B.,& Vujanović, A.. (2021). Hydrological indicators of the riverbed incision along  the free-flowing Danube River reach from Budapest to  Slankamen relevant for the lateral connectivity  between the river channel and floodplains. in Proceedings of 43rd IAD Conference  Rivers and Floodplains in the  Anthropocene – Upcoming Challenges  in the Danube River Basin
Catholic University of Eichstätt-Ingolstadt., 43, 62-69.
https://doi.org/https://doi.org/10.17904/ku.edoc.28094

Tamás EA, Đorđević D, Kalocsa B, Vujanović A. Hydrological indicators of the riverbed incision along  the free-flowing Danube River reach from Budapest to  Slankamen relevant for the lateral connectivity  between the river channel and floodplains. in Proceedings of 43rd IAD Conference  Rivers and Floodplains in the  Anthropocene – Upcoming Challenges  in the Danube River Basin. 2021;43:62-69.
doi:https://doi.org/10.17904/ku.edoc.28094 .

Tamás, Enikö Ana, Đorđević, Dejana, Kalocsa, Béla, Vujanović, Aleksandar, "Hydrological indicators of the riverbed incision along  the free-flowing Danube River reach from Budapest to  Slankamen relevant for the lateral connectivity  between the river channel and floodplains" in Proceedings of 43rd IAD Conference  Rivers and Floodplains in the  Anthropocene – Upcoming Challenges  in the Danube River Basin, 43 (2021):62-69,
https://doi.org/https://doi.org/10.17904/ku.edoc.28094 . .

TY  - CONF
AU  - Jaćimović, David
AU  - Erić, Ranka
AU  - Đorđević, Dejana
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2611
AB  - У овом раду се на основу забележеног нивограма велике воде током поплавног таласа 2014. године најпре конструише крива протока у кориту за велику воду, а потом се реконструише хидрограм тог поплавног таласа. За конструисање криве протока на основу забележених нивоа у кориту за велику воду користи се метода размене количине кретања између главног корита и плавних површина, која је до сада више пута успешно примењивана за одређивање кривих протока у домену великих вода и у лаборато-ријским каналима и у профилима хидролошких станица. Израчунат хидрограм поплавног таласа пореди се са званичним хидрограмом РХМЗа Србије. У раду се користe подаци са хидролошке станице Уб забележени током поплавног таласа 2014. године. Резултати показују да је у условима уских плавних површина утицај размене количине кретања између плавних површина и главног корита на расподелу протока и укупан проток у кориту за велику воду занемарљив, јер попречни пресек врло брзо након почетка изливања почиње да се понаша као хидраулички хомоген.
AB  - A stage-discharge curve for the compound channel is constructed at the Ub gauging station based on the recorded stage hydrograph during the 2014th-year flood event using the exchange discharge model. Consequently, the curve is used with the same model to reconstruct the corresponding flow hydrograph of the event. The exchange discharge model has been successfully used for the construction of stage-discharge curves in compound laboratory channels and in two river gauging stations. The calculated flow hydrograph is compared to the official one of the Republic Hydrometeorological Service of Serbia. Results clearly indicate that the momentum transfer between the main channel and the floodplain becomes negligible shortly after the initiation of the overbank flow, i.e. that the compound channel starts to behave as a single unit or a simple channel.
PB  - Univerzitet u Beogradu – Građevinski fakultet, Beograd, 2021.
C3  - Zbornik radova 19. savetovanja SDHI i SDH
T1  - Реконструкција поплавног таласа из 2014. године на  хидролошкој станици Уб
T1  - A reconstruction of flow hydrograph of the  2014th-year flood event at the Ub gauging station
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2611
ER  - 

@conference{
author = "Jaćimović, David and Erić, Ranka and Đorđević, Dejana",
year = "2021",
abstract = "У овом раду се на основу забележеног нивограма велике воде током поплавног таласа 2014. године најпре конструише крива протока у кориту за велику воду, а потом се реконструише хидрограм тог поплавног таласа. За конструисање криве протока на основу забележених нивоа у кориту за велику воду користи се метода размене количине кретања између главног корита и плавних површина, која је до сада више пута успешно примењивана за одређивање кривих протока у домену великих вода и у лаборато-ријским каналима и у профилима хидролошких станица. Израчунат хидрограм поплавног таласа пореди се са званичним хидрограмом РХМЗа Србије. У раду се користe подаци са хидролошке станице Уб забележени током поплавног таласа 2014. године. Резултати показују да је у условима уских плавних површина утицај размене количине кретања између плавних површина и главног корита на расподелу протока и укупан проток у кориту за велику воду занемарљив, јер попречни пресек врло брзо након почетка изливања почиње да се понаша као хидраулички хомоген., A stage-discharge curve for the compound channel is constructed at the Ub gauging station based on the recorded stage hydrograph during the 2014th-year flood event using the exchange discharge model. Consequently, the curve is used with the same model to reconstruct the corresponding flow hydrograph of the event. The exchange discharge model has been successfully used for the construction of stage-discharge curves in compound laboratory channels and in two river gauging stations. The calculated flow hydrograph is compared to the official one of the Republic Hydrometeorological Service of Serbia. Results clearly indicate that the momentum transfer between the main channel and the floodplain becomes negligible shortly after the initiation of the overbank flow, i.e. that the compound channel starts to behave as a single unit or a simple channel.",
publisher = "Univerzitet u Beogradu – Građevinski fakultet, Beograd, 2021.",
journal = "Zbornik radova 19. savetovanja SDHI i SDH",
title = "Реконструкција поплавног таласа из 2014. године на  хидролошкој станици Уб, A reconstruction of flow hydrograph of the  2014th-year flood event at the Ub gauging station",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2611"
}

Jaćimović, D., Erić, R.,& Đorđević, D.. (2021). Реконструкција поплавног таласа из 2014. године на  хидролошкој станици Уб. in Zbornik radova 19. savetovanja SDHI i SDH
Univerzitet u Beogradu – Građevinski fakultet, Beograd, 2021...
https://hdl.handle.net/21.15107/rcub_grafar_2611

Jaćimović D, Erić R, Đorđević D. Реконструкција поплавног таласа из 2014. године на  хидролошкој станици Уб. in Zbornik radova 19. savetovanja SDHI i SDH. 2021;.
https://hdl.handle.net/21.15107/rcub_grafar_2611 .

Jaćimović, David, Erić, Ranka, Đorđević, Dejana, "Реконструкција поплавног таласа из 2014. године на  хидролошкој станици Уб" in Zbornik radova 19. savetovanja SDHI i SDH (2021),
https://hdl.handle.net/21.15107/rcub_grafar_2611 .

TY  - CONF
AU  - Tamás, Enikö Anna
AU  - Đorđević, Dejana
AU  - Kalocsa, Béla
AU  - Vujanović, Aleksandar
PY  - 2021
UR  - https://www.ku.de/fileadmin/150307/43rd_IAD_Conference_Proceedings.pdf
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2447
AB  - Hydrological regime plays a primary role in the sustainable management of floodplains, as floodplain ecosystem dynamics and balance are largely based on the dynamics of the flow regime of rivers. In the 1980’s a drying process of the floodplains on the lower Danube reach in Hungary became evident. The first statistical analyses were made for the Hungarian reach in 1992, because foresters noticed an alarming drying process of the floodplain forests. Analyses indicated the lowering of the riverbed of the Danube River. It is considered that the river training works were the main reason for the incision of the riverbed. 

To the authors’ knowledge, no comprehensive analysis of the changes in the water regime for the whole alluvial reach of the middle Danube has been made to date. To fill this gap, authors analyse available time series of the water level and discharge data for the free-flowing alluvial reach of the Danube River, downstream of Budapest, Hungary to the confluence of the Tisa River, in Slankamen, Serbia. This analysis aims at: 1) recognising hydrological indicators of the incision and/or aggradation of the riverbed, 2) estimating the extent of the two processes and the rate 
of change of the riverbed in time based on these indicators, as well as 3) estimating possible 
consequent changes in the frequency of extremities (low flows and high flows).
According to the Water Framework Directive (WFD) the „good status” of the Danube River reach must be achieved. As the river and its floodplains constitute a complex ecological system, this can only be done through the harmonisation of the nature protection aspect reconstruction projects, WFD programmes of measures, flood management measures and navigation development.
If traditional river training activities continue, riverbed erosion will persist or increase in the future, 
resulting in slow, but continuous drying of floodplains, that are very important nature conservation 
areas. Consequently, the majority of floodplain reconstruction works’ effects might become negligible, while navigation problems will remain unsolved.
In the EU Floods Directive, natural flood management is an important issue, with a focus on increasing water retention capacities by e.g. the re-connection of rivers with their floodplains and restoration of wetlands which can store flood water and help “slow the flow” of flood waters. In this respect, lateral connectivity is one of the most essential issues, as it is for the species inhabiting floodplains and rivers. However, floodplain lateral connectivity is already severed by the decreasing frequency and extent of inundation. The studied hydrological regime is the most important determinant of floodplain habitats.
PB  - Catholic University of Eichstätt-Ingolstadt
C3  - Proceedings of 43rd IAD Conference  Rivers and Floodplains in the  Anthropocene – Upcoming Challenges  in the Danube River Basin
T1  - Hydrological indicators of the riverbed incision along the free-flowing Danube  River reach from Budapest to Slankamen relevant for the lateral connectivity  between the river channel and floodplains
SP  - 6
VL  - 43
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2447
ER  - 

@conference{
author = "Tamás, Enikö Anna and Đorđević, Dejana and Kalocsa, Béla and Vujanović, Aleksandar",
year = "2021",
abstract = "Hydrological regime plays a primary role in the sustainable management of floodplains, as floodplain ecosystem dynamics and balance are largely based on the dynamics of the flow regime of rivers. In the 1980’s a drying process of the floodplains on the lower Danube reach in Hungary became evident. The first statistical analyses were made for the Hungarian reach in 1992, because foresters noticed an alarming drying process of the floodplain forests. Analyses indicated the lowering of the riverbed of the Danube River. It is considered that the river training works were the main reason for the incision of the riverbed. 

To the authors’ knowledge, no comprehensive analysis of the changes in the water regime for the whole alluvial reach of the middle Danube has been made to date. To fill this gap, authors analyse available time series of the water level and discharge data for the free-flowing alluvial reach of the Danube River, downstream of Budapest, Hungary to the confluence of the Tisa River, in Slankamen, Serbia. This analysis aims at: 1) recognising hydrological indicators of the incision and/or aggradation of the riverbed, 2) estimating the extent of the two processes and the rate 
of change of the riverbed in time based on these indicators, as well as 3) estimating possible 
consequent changes in the frequency of extremities (low flows and high flows).
According to the Water Framework Directive (WFD) the „good status” of the Danube River reach must be achieved. As the river and its floodplains constitute a complex ecological system, this can only be done through the harmonisation of the nature protection aspect reconstruction projects, WFD programmes of measures, flood management measures and navigation development.
If traditional river training activities continue, riverbed erosion will persist or increase in the future, 
resulting in slow, but continuous drying of floodplains, that are very important nature conservation 
areas. Consequently, the majority of floodplain reconstruction works’ effects might become negligible, while navigation problems will remain unsolved.
In the EU Floods Directive, natural flood management is an important issue, with a focus on increasing water retention capacities by e.g. the re-connection of rivers with their floodplains and restoration of wetlands which can store flood water and help “slow the flow” of flood waters. In this respect, lateral connectivity is one of the most essential issues, as it is for the species inhabiting floodplains and rivers. However, floodplain lateral connectivity is already severed by the decreasing frequency and extent of inundation. The studied hydrological regime is the most important determinant of floodplain habitats.",
publisher = "Catholic University of Eichstätt-Ingolstadt",
journal = "Proceedings of 43rd IAD Conference  Rivers and Floodplains in the  Anthropocene – Upcoming Challenges  in the Danube River Basin",
title = "Hydrological indicators of the riverbed incision along the free-flowing Danube  River reach from Budapest to Slankamen relevant for the lateral connectivity  between the river channel and floodplains",
pages = "6",
volume = "43",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2447"
}

Tamás, E. A., Đorđević, D., Kalocsa, B.,& Vujanović, A.. (2021). Hydrological indicators of the riverbed incision along the free-flowing Danube  River reach from Budapest to Slankamen relevant for the lateral connectivity  between the river channel and floodplains. in Proceedings of 43rd IAD Conference  Rivers and Floodplains in the  Anthropocene – Upcoming Challenges  in the Danube River Basin
Catholic University of Eichstätt-Ingolstadt., 43, 6.
https://hdl.handle.net/21.15107/rcub_grafar_2447

Tamás EA, Đorđević D, Kalocsa B, Vujanović A. Hydrological indicators of the riverbed incision along the free-flowing Danube  River reach from Budapest to Slankamen relevant for the lateral connectivity  between the river channel and floodplains. in Proceedings of 43rd IAD Conference  Rivers and Floodplains in the  Anthropocene – Upcoming Challenges  in the Danube River Basin. 2021;43:6.
https://hdl.handle.net/21.15107/rcub_grafar_2447 .

Tamás, Enikö Anna, Đorđević, Dejana, Kalocsa, Béla, Vujanović, Aleksandar, "Hydrological indicators of the riverbed incision along the free-flowing Danube  River reach from Budapest to Slankamen relevant for the lateral connectivity  between the river channel and floodplains" in Proceedings of 43rd IAD Conference  Rivers and Floodplains in the  Anthropocene – Upcoming Challenges  in the Danube River Basin, 43 (2021):6,
https://hdl.handle.net/21.15107/rcub_grafar_2447 .

TY  - JOUR
AU  - Vukićević Biševac, Ivana
AU  - Nikolić, Miloš
AU  - Đorđević, Dejana
AU  - Vukadinović, Katarina
PY  - 2021
UR  - https://www.vodoprivreda.net/
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2443
AB  - U radu je razmatran proces transporta i pretovara kontejnera dopremljenih drumskim teretnim vozilima u lučki kontejnerski terminal. Ulazno - izlazna kapija, inspekcijsko mesto i skladišna dizalica mogu se posmatrati kao kanali sistema masovnog opsluživanja (SMO) koji redom opslužuju kontejnere. U analizi se primenjuje redna veza SMO. Cilj primene ovakve veze 
je određivanje intenziteta opsluživanja u pojedinačnim sistemima da bi se smanjilo vreme čekanja kontejnera unutar lučkog terminala i posledično vreme obrta drumskih teretnih vozila koja dopremaju izvozne kontejnere. 
Opisan je simulacioni model redne veze SMO pod određenim pretpostavkama o raspodelama verovatnoća vremena opsluživanja. Rezultati pokazuju da se ovakva veza SMO može uspešno koristiti za modeliranje opsluživanja kontejnera.
AB  - A serial system for handling export containers at a port terminal is considered in this paper. The steps that a container must follow in passing through the various port control points are: an entry gate where some paperwork is done, another control point such as weighting/inspection station, and a bridge-type yard crane that lifts containers onto a storage area. An entry gate, weighting/inspection station and a yard crane can be considered as service channels of queuing systems that operate in series.
The goal of implementation of serial queuing systems is to determine the intensity of service in an individual queuing system to reduce the waiting time of containers inside the port terminal, as well as the turnaround time of road freight vehicles that deliver export containers.
Under the specified assumptions related to probability distributions for service time, the simulation model of a serial system of queuing systems is developed. It has been shown that modeling of container service at port terminals can be carried out successfully by applying serial queuing systems.
PB  - Srpsko društvo za odvodnjavanje i navodnjavanje
T2  - Vodoprivreda
T1  - Modeliranje opsluživanja kontejnera u lučkim terminalima
T1  - Modelling of container service at port terminals
EP  - 84
IS  - 309-310
SP  - 75
VL  - 53
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2443
ER  - 

@article{
author = "Vukićević Biševac, Ivana and Nikolić, Miloš and Đorđević, Dejana and Vukadinović, Katarina",
year = "2021",
abstract = "U radu je razmatran proces transporta i pretovara kontejnera dopremljenih drumskim teretnim vozilima u lučki kontejnerski terminal. Ulazno - izlazna kapija, inspekcijsko mesto i skladišna dizalica mogu se posmatrati kao kanali sistema masovnog opsluživanja (SMO) koji redom opslužuju kontejnere. U analizi se primenjuje redna veza SMO. Cilj primene ovakve veze 
je određivanje intenziteta opsluživanja u pojedinačnim sistemima da bi se smanjilo vreme čekanja kontejnera unutar lučkog terminala i posledično vreme obrta drumskih teretnih vozila koja dopremaju izvozne kontejnere. 
Opisan je simulacioni model redne veze SMO pod određenim pretpostavkama o raspodelama verovatnoća vremena opsluživanja. Rezultati pokazuju da se ovakva veza SMO može uspešno koristiti za modeliranje opsluživanja kontejnera., A serial system for handling export containers at a port terminal is considered in this paper. The steps that a container must follow in passing through the various port control points are: an entry gate where some paperwork is done, another control point such as weighting/inspection station, and a bridge-type yard crane that lifts containers onto a storage area. An entry gate, weighting/inspection station and a yard crane can be considered as service channels of queuing systems that operate in series.
The goal of implementation of serial queuing systems is to determine the intensity of service in an individual queuing system to reduce the waiting time of containers inside the port terminal, as well as the turnaround time of road freight vehicles that deliver export containers.
Under the specified assumptions related to probability distributions for service time, the simulation model of a serial system of queuing systems is developed. It has been shown that modeling of container service at port terminals can be carried out successfully by applying serial queuing systems.",
publisher = "Srpsko društvo za odvodnjavanje i navodnjavanje",
journal = "Vodoprivreda",
title = "Modeliranje opsluživanja kontejnera u lučkim terminalima, Modelling of container service at port terminals",
pages = "84-75",
number = "309-310",
volume = "53",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2443"
}

Vukićević Biševac, I., Nikolić, M., Đorđević, D.,& Vukadinović, K.. (2021). Modeliranje opsluživanja kontejnera u lučkim terminalima. in Vodoprivreda
Srpsko društvo za odvodnjavanje i navodnjavanje., 53(309-310), 75-84.
https://hdl.handle.net/21.15107/rcub_grafar_2443

Vukićević Biševac I, Nikolić M, Đorđević D, Vukadinović K. Modeliranje opsluživanja kontejnera u lučkim terminalima. in Vodoprivreda. 2021;53(309-310):75-84.
https://hdl.handle.net/21.15107/rcub_grafar_2443 .

Vukićević Biševac, Ivana, Nikolić, Miloš, Đorđević, Dejana, Vukadinović, Katarina, "Modeliranje opsluživanja kontejnera u lučkim terminalima" in Vodoprivreda, 53, no. 309-310 (2021):75-84,
https://hdl.handle.net/21.15107/rcub_grafar_2443 .

TY  - JOUR
AU  - Đorđević, Dejana
AU  - Pokrajac, Dubravka
PY  - 2020
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2246
AB  - U radu se prikazuje metodologija koja je nastala kao rezultat potrebe da se matematički rigorozno opišu poja-ve i procesi kod prostorno heterogenog strujanja, tj. strujanja u sredinama koje ispunjavaju i tečna i čvrsta faza ili strujanja neposredno iznad elemanata rapavosti bilo da je reč o krupnom nanosu, životinjskim orga-nizmima na dnu ili vodenoj vegetaciji. Reč je o meto-dologiji dvostrukog osrednjavanja u kojoj se Navije-Stoksove jednačine sukcesivno osrednjavaju po vremenu i prostoru. Kroz istorijski pregled pokazuje se kako se došlo do ideje kombinovanja vremenskog osrednjavanja karakterističnog za turbulentne tokove i prostornog osrednjavanja, karakterističnog za tečenje kroz poroznu sredinu, a potom i do ideje da se metodologija primeni u hidraulici otvorenih tokova za modeliranje tečenja u koritima sa krupnim nanosom (šljunkom, oblucima i gromadama), koritima i kanalima sa potopljenom i nepotopljenom vegetacijom ili preko plavnih površina. Daju se definicije fiktivne i sopstvene prostorno (zapreminski) osrednjene veličine, prikazuju pravila dvostrukog osrednjavanja i pokazuje kako se ona primenjuju da bi se dobile jednačine koje opisuju tečenje preko nepokretnog rapavog dna. Na primeru dvostrukog osrednjavanja količine kretanja iz [23] pokazuje se da redosled osrednjavanja – vremensko pa prostorno, ili prostorno pa vremensko ne utiče na ko-načni oblik dvostruko osrednjenih Navije-Stoksovih jednačina. Takođe se pokazuje da se matematički rigo-roznim postupkom dvostrukog osrednjavanja dobijaju jednačine u kojima figurišu sve relevantne sile / naponi koji se u samo vremenski osrednjene, Rejnoldsove je-dnačine dodaju ad hoc u zavisnosti od problema koji se rešava. Primeri su sila otpora oblika koju stvaraju ele-menti rapavosti i sila trenja po površini tih elemenata, kao i napon koji je posledica prostorne nerav-nomernosti rasporeda brzina izazvane prisustvom elemenata rapavosti – tzv. napon usled prisustva elemenata rapavosti. Primena metodologije dvostrukog osrednjavanja prikazuje se na primeru tečenja preko rapavog, poroznog dna sastavljenog od pet slojeva pravino poređanih kuglica. Prikazuju se rasporedi brzine u pravcu glavnog toka između kuglica po dubini poroznog dna i u slobodnom toku iznad rapavog dna, u vertikalnoj ravni paralelnoj sa glavnim tokom i rasporedi po dubini toka ove komponente dvostruko osrednjene brzine, dvostruko osrednjenog Rejnoldsovog napona iz vertikalne ravni i dvostruko osrednjene kinetičke energije turbulencije, koji na prelazu iz poroznog dna u slobodan tok imaju velike gradijente.
AB  - A methodology that was developed to provide rigorous mathematical description of spatially heterogeneous flows (multiphase flows, ground water flows or flows over rough beds) and related processes is presented in this paper. This is the double averaging methodology (DAM) in which Navier-Stokes equations are successively averaged in time and space. The DAM emergence and the development are traced back through the historical review. The review reveals the origins of the idea to combine time-averaging of turbulent flows and space-averaging of ground water or multiphase flows and to apply it to rough-bed open channel flows (gravel- bed rivers, vegetated and environmental flows). The review is followed by the DAM basics – definitions of superficial and intrinsic averages, spatial-averaging rules and averaging theorems and procedures, all necessary for the derivation of double-averaged Navier-Stokes (DANS) equations. The fact that the final form of DANS is independent of the averaging sequence (time-space or space-time) is illustrated on the example of nonviscous components of the total fluid stress as discussed in [23]. It is also accentuated that rigorously derived DANS contain all relevant forces that are added to the Reynolds-averaged Navier-Stokes equations on the ad hoc basis, depending on the problem under consideration. Typical examples are drag and shear forces caused by roughness elements and form-induced stress. The application of DAM to rough-bed flows is presented on the example of flow over permeable bed composed of five layers of spheres packed in the cubic arrangemet. Streamwise velocity distributions in the streamwise oriented vertical plane is given to show velocity gradients near the top of spheres at the transition to the free flow layer. Results are presented for the profiles of double-averaged streamwise velocity, spatially-averaged shear Reynolds stress and spatially-averaged TKE, that both exhibit large gradients near the bed.
PB  - Srpsko društvo za odvodnjavanje i navodnjavanje
T2  - Vodoprivreda
T1  - O metodologiji dvostrukog osrednjavanja - pregled istorijskog razvoja i teorijske osnove
T1  - On the double averaging methodology – hystorical review and theoretical background
EP  - 200
IS  - 306-308
SP  - 185
VL  - 52
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2246
ER  - 

@article{
author = "Đorđević, Dejana and Pokrajac, Dubravka",
year = "2020",
abstract = "U radu se prikazuje metodologija koja je nastala kao rezultat potrebe da se matematički rigorozno opišu poja-ve i procesi kod prostorno heterogenog strujanja, tj. strujanja u sredinama koje ispunjavaju i tečna i čvrsta faza ili strujanja neposredno iznad elemanata rapavosti bilo da je reč o krupnom nanosu, životinjskim orga-nizmima na dnu ili vodenoj vegetaciji. Reč je o meto-dologiji dvostrukog osrednjavanja u kojoj se Navije-Stoksove jednačine sukcesivno osrednjavaju po vremenu i prostoru. Kroz istorijski pregled pokazuje se kako se došlo do ideje kombinovanja vremenskog osrednjavanja karakterističnog za turbulentne tokove i prostornog osrednjavanja, karakterističnog za tečenje kroz poroznu sredinu, a potom i do ideje da se metodologija primeni u hidraulici otvorenih tokova za modeliranje tečenja u koritima sa krupnim nanosom (šljunkom, oblucima i gromadama), koritima i kanalima sa potopljenom i nepotopljenom vegetacijom ili preko plavnih površina. Daju se definicije fiktivne i sopstvene prostorno (zapreminski) osrednjene veličine, prikazuju pravila dvostrukog osrednjavanja i pokazuje kako se ona primenjuju da bi se dobile jednačine koje opisuju tečenje preko nepokretnog rapavog dna. Na primeru dvostrukog osrednjavanja količine kretanja iz [23] pokazuje se da redosled osrednjavanja – vremensko pa prostorno, ili prostorno pa vremensko ne utiče na ko-načni oblik dvostruko osrednjenih Navije-Stoksovih jednačina. Takođe se pokazuje da se matematički rigo-roznim postupkom dvostrukog osrednjavanja dobijaju jednačine u kojima figurišu sve relevantne sile / naponi koji se u samo vremenski osrednjene, Rejnoldsove je-dnačine dodaju ad hoc u zavisnosti od problema koji se rešava. Primeri su sila otpora oblika koju stvaraju ele-menti rapavosti i sila trenja po površini tih elemenata, kao i napon koji je posledica prostorne nerav-nomernosti rasporeda brzina izazvane prisustvom elemenata rapavosti – tzv. napon usled prisustva elemenata rapavosti. Primena metodologije dvostrukog osrednjavanja prikazuje se na primeru tečenja preko rapavog, poroznog dna sastavljenog od pet slojeva pravino poređanih kuglica. Prikazuju se rasporedi brzine u pravcu glavnog toka između kuglica po dubini poroznog dna i u slobodnom toku iznad rapavog dna, u vertikalnoj ravni paralelnoj sa glavnim tokom i rasporedi po dubini toka ove komponente dvostruko osrednjene brzine, dvostruko osrednjenog Rejnoldsovog napona iz vertikalne ravni i dvostruko osrednjene kinetičke energije turbulencije, koji na prelazu iz poroznog dna u slobodan tok imaju velike gradijente., A methodology that was developed to provide rigorous mathematical description of spatially heterogeneous flows (multiphase flows, ground water flows or flows over rough beds) and related processes is presented in this paper. This is the double averaging methodology (DAM) in which Navier-Stokes equations are successively averaged in time and space. The DAM emergence and the development are traced back through the historical review. The review reveals the origins of the idea to combine time-averaging of turbulent flows and space-averaging of ground water or multiphase flows and to apply it to rough-bed open channel flows (gravel- bed rivers, vegetated and environmental flows). The review is followed by the DAM basics – definitions of superficial and intrinsic averages, spatial-averaging rules and averaging theorems and procedures, all necessary for the derivation of double-averaged Navier-Stokes (DANS) equations. The fact that the final form of DANS is independent of the averaging sequence (time-space or space-time) is illustrated on the example of nonviscous components of the total fluid stress as discussed in [23]. It is also accentuated that rigorously derived DANS contain all relevant forces that are added to the Reynolds-averaged Navier-Stokes equations on the ad hoc basis, depending on the problem under consideration. Typical examples are drag and shear forces caused by roughness elements and form-induced stress. The application of DAM to rough-bed flows is presented on the example of flow over permeable bed composed of five layers of spheres packed in the cubic arrangemet. Streamwise velocity distributions in the streamwise oriented vertical plane is given to show velocity gradients near the top of spheres at the transition to the free flow layer. Results are presented for the profiles of double-averaged streamwise velocity, spatially-averaged shear Reynolds stress and spatially-averaged TKE, that both exhibit large gradients near the bed.",
publisher = "Srpsko društvo za odvodnjavanje i navodnjavanje",
journal = "Vodoprivreda",
title = "O metodologiji dvostrukog osrednjavanja - pregled istorijskog razvoja i teorijske osnove, On the double averaging methodology – hystorical review and theoretical background",
pages = "200-185",
number = "306-308",
volume = "52",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2246"
}

Đorđević, D.,& Pokrajac, D.. (2020). O metodologiji dvostrukog osrednjavanja - pregled istorijskog razvoja i teorijske osnove. in Vodoprivreda
Srpsko društvo za odvodnjavanje i navodnjavanje., 52(306-308), 185-200.
https://hdl.handle.net/21.15107/rcub_grafar_2246

Đorđević D, Pokrajac D. O metodologiji dvostrukog osrednjavanja - pregled istorijskog razvoja i teorijske osnove. in Vodoprivreda. 2020;52(306-308):185-200.
https://hdl.handle.net/21.15107/rcub_grafar_2246 .

Đorđević, Dejana, Pokrajac, Dubravka, "O metodologiji dvostrukog osrednjavanja - pregled istorijskog razvoja i teorijske osnove" in Vodoprivreda, 52, no. 306-308 (2020):185-200,
https://hdl.handle.net/21.15107/rcub_grafar_2246 .

TY  - CONF
AU  - Đorđević, Dejana
AU  - Đurović, Nemanja
AU  - Đurić, Petar
AU  - Stanić, Filip
AU  - Milinković, Nikola
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1853
AB  - The independent subsections model (ISM) was developed for the steady uniform and non-uniform flow computations in compound channels with constant and variable channel widths. It was thoroughly tested against experimental data in different compound channel layouts. Since the existing set of equations is derived for the simple compound channel geometry, this paper aims at: 1) extending the model to arbitrary geometries, 2) adding the term that accounts for the influence of emergent rigid floodplain vegetation into momentum equations and 3) at validating the method against available floods data from one river gauging station. Comparison with the recorded data has shown that the optimal value for the model parameter ψt = 0.10 is greater than that obtained for the canal with smooth floodplains. Partial head losses due to vegetation are two orders of magnitude greater than the friction loss for H* > 0.25 when they are calculated with the formula for the volume drag force caused by an array of emergent rigid vegetation, proposed by Nepf,. The head loss due to a drag grows faster with the increase in floodplain submergence ratio on the floodplain with the constrained width. In the presence of vegetation on the floodplains, the head loss caused by mass exchange due to non-prismaticity of the compound channel does not depend on the floodplain width. This component of the head loss is balanced with the sum of head losses due to turbulence diffusion and vegetation drag.
PB  - Pª Bajo Virgen del Puerto, 3 28005 Madrid, Spain: International Association for Hydro-Environment Engineering and Research -IAHR-
C3  - E-proceedings of the 38th IAHR World Congress September 1-6, 2019, Panama City, Panama
T1  - Application of the independent subsections method for the estimation of the rating curve in the compound channel – a case study
DO  - 10.3850/38WC092019-1234
ER  - 

@conference{
author = "Đorđević, Dejana and Đurović, Nemanja and Đurić, Petar and Stanić, Filip and Milinković, Nikola",
year = "2019",
abstract = "The independent subsections model (ISM) was developed for the steady uniform and non-uniform flow computations in compound channels with constant and variable channel widths. It was thoroughly tested against experimental data in different compound channel layouts. Since the existing set of equations is derived for the simple compound channel geometry, this paper aims at: 1) extending the model to arbitrary geometries, 2) adding the term that accounts for the influence of emergent rigid floodplain vegetation into momentum equations and 3) at validating the method against available floods data from one river gauging station. Comparison with the recorded data has shown that the optimal value for the model parameter ψt = 0.10 is greater than that obtained for the canal with smooth floodplains. Partial head losses due to vegetation are two orders of magnitude greater than the friction loss for H* > 0.25 when they are calculated with the formula for the volume drag force caused by an array of emergent rigid vegetation, proposed by Nepf,. The head loss due to a drag grows faster with the increase in floodplain submergence ratio on the floodplain with the constrained width. In the presence of vegetation on the floodplains, the head loss caused by mass exchange due to non-prismaticity of the compound channel does not depend on the floodplain width. This component of the head loss is balanced with the sum of head losses due to turbulence diffusion and vegetation drag.",
publisher = "Pª Bajo Virgen del Puerto, 3 28005 Madrid, Spain: International Association for Hydro-Environment Engineering and Research -IAHR-",
journal = "E-proceedings of the 38th IAHR World Congress September 1-6, 2019, Panama City, Panama",
title = "Application of the independent subsections method for the estimation of the rating curve in the compound channel – a case study",
doi = "10.3850/38WC092019-1234"
}

Đorđević, D., Đurović, N., Đurić, P., Stanić, F.,& Milinković, N.. (2019). Application of the independent subsections method for the estimation of the rating curve in the compound channel – a case study. in E-proceedings of the 38th IAHR World Congress September 1-6, 2019, Panama City, Panama
Pª Bajo Virgen del Puerto, 3 28005 Madrid, Spain: International Association for Hydro-Environment Engineering and Research -IAHR-..
https://doi.org/10.3850/38WC092019-1234

Đorđević D, Đurović N, Đurić P, Stanić F, Milinković N. Application of the independent subsections method for the estimation of the rating curve in the compound channel – a case study. in E-proceedings of the 38th IAHR World Congress September 1-6, 2019, Panama City, Panama. 2019;.
doi:10.3850/38WC092019-1234 .

Đorđević, Dejana, Đurović, Nemanja, Đurić, Petar, Stanić, Filip, Milinković, Nikola, "Application of the independent subsections method for the estimation of the rating curve in the compound channel – a case study" in E-proceedings of the 38th IAHR World Congress September 1-6, 2019, Panama City, Panama (2019),
https://doi.org/10.3850/38WC092019-1234 . .

TY  - JOUR
AU  - Đorđević, Dejana
AU  - Stanić, Filip
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1846
AB  - Cilj ovog rada je da našu stručnu javnost upozna sa još jednim modelom za proračun linijskog tečenja u koritu za veliku vodu koji, u proračunu gubitaka energije osim trenja, uzima u obzir i razmenu količine kretanja između glavnog korita i plavnih površina, i razmenu mase usled neprizmatičnosti korita. Reč je o modelu nezavisnih segmenata koji omogućava proračun linija nivoa duž svakog od tri segmenta korita za veliku vodu ali i procenu krive protoka u složenom preseku u domenu vodostaja koji premašuju kote obala na granicama glavnog korita. Za proveru modela iskorišćeni su rezultati merenja u pravolinijskom prizmatičnom laboratorijskom kanalu Hidrauličke laboratorije u Volingfordu
koji je namenski napravljen za ispitivanje tečenja u koritu za veliku vodu. Za utvrđivanje uticaja širine plavnih površina na krivu protoka korišćeni su ogledi sa širim i užim glatkim plavnim površinama i ogled u kojem je isključena jedna plavna površina, dok su za utvrđivanje uticaja rapavosti plavnih površina korišćeni ogledi sa glatkim i orapavljenim plavnim površinama. Rezultati ovog modela upoređeni su sa već prikazanim modelom razmene količine kretanja, a da bi se sagledale prednosti ova dva nedavno predložena modela u odnosu
na modele koji se standardno koriste u inženjerskoj praksi, dobijeni rezultati upoređeni su sa rezultatima tradicionalnih modela. Poređenje ukazuje na to da se najbolja slaganja sa merenjima postižu upravo primenom modela koji uzimaju u obzir sve izvore gubtaka energije, dok se tradicionalnim modelom
zasnovanim na podeli preseka na hidraulički homogene segmente vrednosti protoka značajno precenjuju.
PB  - Srpsko društvo za odvodnjavanje i navodnjavanje
T2  - Vodoprivreda
T1  - Prikaz modela nezavisnih segmenata za proračun linijskog tečenja u koritu za veliku vodu
EP  - 136
IS  - 297-299
SP  - 123
VL  - 51
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1846
ER  - 

@article{
author = "Đorđević, Dejana and Stanić, Filip",
year = "2019",
abstract = "Cilj ovog rada je da našu stručnu javnost upozna sa još jednim modelom za proračun linijskog tečenja u koritu za veliku vodu koji, u proračunu gubitaka energije osim trenja, uzima u obzir i razmenu količine kretanja između glavnog korita i plavnih površina, i razmenu mase usled neprizmatičnosti korita. Reč je o modelu nezavisnih segmenata koji omogućava proračun linija nivoa duž svakog od tri segmenta korita za veliku vodu ali i procenu krive protoka u složenom preseku u domenu vodostaja koji premašuju kote obala na granicama glavnog korita. Za proveru modela iskorišćeni su rezultati merenja u pravolinijskom prizmatičnom laboratorijskom kanalu Hidrauličke laboratorije u Volingfordu
koji je namenski napravljen za ispitivanje tečenja u koritu za veliku vodu. Za utvrđivanje uticaja širine plavnih površina na krivu protoka korišćeni su ogledi sa širim i užim glatkim plavnim površinama i ogled u kojem je isključena jedna plavna površina, dok su za utvrđivanje uticaja rapavosti plavnih površina korišćeni ogledi sa glatkim i orapavljenim plavnim površinama. Rezultati ovog modela upoređeni su sa već prikazanim modelom razmene količine kretanja, a da bi se sagledale prednosti ova dva nedavno predložena modela u odnosu
na modele koji se standardno koriste u inženjerskoj praksi, dobijeni rezultati upoređeni su sa rezultatima tradicionalnih modela. Poređenje ukazuje na to da se najbolja slaganja sa merenjima postižu upravo primenom modela koji uzimaju u obzir sve izvore gubtaka energije, dok se tradicionalnim modelom
zasnovanim na podeli preseka na hidraulički homogene segmente vrednosti protoka značajno precenjuju.",
publisher = "Srpsko društvo za odvodnjavanje i navodnjavanje",
journal = "Vodoprivreda",
title = "Prikaz modela nezavisnih segmenata za proračun linijskog tečenja u koritu za veliku vodu",
pages = "136-123",
number = "297-299",
volume = "51",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1846"
}

Đorđević, D.,& Stanić, F.. (2019). Prikaz modela nezavisnih segmenata za proračun linijskog tečenja u koritu za veliku vodu. in Vodoprivreda
Srpsko društvo za odvodnjavanje i navodnjavanje., 51(297-299), 123-136.
https://hdl.handle.net/21.15107/rcub_grafar_1846

Đorđević D, Stanić F. Prikaz modela nezavisnih segmenata za proračun linijskog tečenja u koritu za veliku vodu. in Vodoprivreda. 2019;51(297-299):123-136.
https://hdl.handle.net/21.15107/rcub_grafar_1846 .

Đorđević, Dejana, Stanić, Filip, "Prikaz modela nezavisnih segmenata za proračun linijskog tečenja u koritu za veliku vodu" in Vodoprivreda, 51, no. 297-299 (2019):123-136,
https://hdl.handle.net/21.15107/rcub_grafar_1846 .

TY  - JOUR
AU  - Sudar, Nedeljko
AU  - Blagojević, Vujadin
AU  - Dašić, Tina
AU  - Đorđević, Dejana
AU  - Stanić, Miloš
AU  - Jaćimović, Nenad
AU  - Đorđević, Branislav
AU  - Topalović, Žana
AU  - Marilović, Slobodan
AU  - Cupać, Raduška
AU  - Bosankić, Goran
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1855
AB  - Na području Republike Srpske i Bosne i Hercegovine integralni vodoprivredni sistemi su djelimično ili veoma slabo razvijeni. Procenat realizovanih sistema je značajno manji od iskazanih vodoprivrednih potreba i očekivanih ciljeva. Uvažavajući obaveze ispunjavanja uslova iz Direktiva o vodama, bitno je uočiti značajnu činjenicu da je u većini razvijenih zemalja EU proces razvoja integralnih sistema uglavnom završen.

U BiH djelimično su realizovani sistemi na Drini, Neretvi, Trebišnjici i Vrbasu, a ostali slivovi nemaju
izgrađene ili dokumentacijom planirane ključne integralne vodoprivredne sisteme. Kao poseban primjer
nerazvijenosti i deficita iskazanih potreba za rezervama vode izdvaja se rijeka Bosna.

U polazištima za ispunjavanje zahtjeva Direktiva za BiH i Republiku Srpsku postoje suštinska tehnička
ograničenja koja treba uvažiti. Na slivu rijeke Vrbas koji je suočen sa nepotpuno razvijenim integralnim
vodoprivrednim sistemima, na bazi sprovedenih analiza iz ’pilot’ Plana upravljanja rizikom od poplava za sliv rijeke Vrbas Republike Srpske, daju se strateške preporuke koje su bitne za zaštitu od voda, uređenje prostora i razvoj društvene zajednice na tom slivnom području uvažavajući zatečeno stanje, višenamjenske potrebe korišćenja voda i preuzete zahtjeve ekološkog statusa voda iz Direktiva o vodama.

U strateškom opredjeljenju, sektor voda u Republici Srpskoj mora neodložno, planski i ozbiljno pristupiti planiranju i razvoju integralnih vodoprivrednih sistema. Ovaj proces je poželjno koordinisano i sinhronizovano započeti u saradnji sa sektorom voda u Federaciji BiH, imajući u vidu uticaje sa uzvodnih područja na vodne režime malih i velikih voda.

Period tranzicije, do pristupanja pregovorima i članstvu u EU mora se racionalno iskoristiti, na način da se u svim dokumentima sektora voda zahtjevi Direktiva prilagode razvojnim prioritetima. To znači da se u Planovima upravljanja rizicima od poplava potencira planiranje i izgradnja ključnih akumulacija i ostalih objekata integralnih vodoprivrednih sistema. Takav pristup će omogućiti da se obezbijedi dobar ekološki i hemijski status voda, odgovarajuće potrebe za vodom i preduslovi za efikasniju aktivnu zaštitu od poplava.

Zbog toga treba decidno iskazati potrebe i iste ostvariti razvojnim ciklusom uz pomoć EU. Po tom osnovu bi bilo korisno navesti primjere iz EU (Španija) i nastojati da se integralni vodoprivredni sistemi u Republici Srpskoj i BiH izgrade do potrebnog nivoa koji garantuje funkcionalnost, održivost i odgovarajuće upravljanje.

Zakon o vodama i strateški dokumenti Republike Srpske iz oblasti voda (’Strategija upravljanja vodama
Republike Srpske’), daju mogućnost da se integralni vodoprivredni sistemi razvijaju do potrebnog kapaciteta.
PB  - Srpsko društvo za odvodnjavanje i navodnjavanje
T2  - Vodoprivreda
T1  - Planiranje i razvoj integralnih vodoprivredenih sistema prema načelima ključnih direktiva o vodama EU - na primeru reke Vrbas u Republici Spskoj
EP  - 242
IS  - 300-302
SP  - 225
VL  - 51
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1855
ER  - 

@article{
author = "Sudar, Nedeljko and Blagojević, Vujadin and Dašić, Tina and Đorđević, Dejana and Stanić, Miloš and Jaćimović, Nenad and Đorđević, Branislav and Topalović, Žana and Marilović, Slobodan and Cupać, Raduška and Bosankić, Goran",
year = "2019",
abstract = "Na području Republike Srpske i Bosne i Hercegovine integralni vodoprivredni sistemi su djelimično ili veoma slabo razvijeni. Procenat realizovanih sistema je značajno manji od iskazanih vodoprivrednih potreba i očekivanih ciljeva. Uvažavajući obaveze ispunjavanja uslova iz Direktiva o vodama, bitno je uočiti značajnu činjenicu da je u većini razvijenih zemalja EU proces razvoja integralnih sistema uglavnom završen.

U BiH djelimično su realizovani sistemi na Drini, Neretvi, Trebišnjici i Vrbasu, a ostali slivovi nemaju
izgrađene ili dokumentacijom planirane ključne integralne vodoprivredne sisteme. Kao poseban primjer
nerazvijenosti i deficita iskazanih potreba za rezervama vode izdvaja se rijeka Bosna.

U polazištima za ispunjavanje zahtjeva Direktiva za BiH i Republiku Srpsku postoje suštinska tehnička
ograničenja koja treba uvažiti. Na slivu rijeke Vrbas koji je suočen sa nepotpuno razvijenim integralnim
vodoprivrednim sistemima, na bazi sprovedenih analiza iz ’pilot’ Plana upravljanja rizikom od poplava za sliv rijeke Vrbas Republike Srpske, daju se strateške preporuke koje su bitne za zaštitu od voda, uređenje prostora i razvoj društvene zajednice na tom slivnom području uvažavajući zatečeno stanje, višenamjenske potrebe korišćenja voda i preuzete zahtjeve ekološkog statusa voda iz Direktiva o vodama.

U strateškom opredjeljenju, sektor voda u Republici Srpskoj mora neodložno, planski i ozbiljno pristupiti planiranju i razvoju integralnih vodoprivrednih sistema. Ovaj proces je poželjno koordinisano i sinhronizovano započeti u saradnji sa sektorom voda u Federaciji BiH, imajući u vidu uticaje sa uzvodnih područja na vodne režime malih i velikih voda.

Period tranzicije, do pristupanja pregovorima i članstvu u EU mora se racionalno iskoristiti, na način da se u svim dokumentima sektora voda zahtjevi Direktiva prilagode razvojnim prioritetima. To znači da se u Planovima upravljanja rizicima od poplava potencira planiranje i izgradnja ključnih akumulacija i ostalih objekata integralnih vodoprivrednih sistema. Takav pristup će omogućiti da se obezbijedi dobar ekološki i hemijski status voda, odgovarajuće potrebe za vodom i preduslovi za efikasniju aktivnu zaštitu od poplava.

Zbog toga treba decidno iskazati potrebe i iste ostvariti razvojnim ciklusom uz pomoć EU. Po tom osnovu bi bilo korisno navesti primjere iz EU (Španija) i nastojati da se integralni vodoprivredni sistemi u Republici Srpskoj i BiH izgrade do potrebnog nivoa koji garantuje funkcionalnost, održivost i odgovarajuće upravljanje.

Zakon o vodama i strateški dokumenti Republike Srpske iz oblasti voda (’Strategija upravljanja vodama
Republike Srpske’), daju mogućnost da se integralni vodoprivredni sistemi razvijaju do potrebnog kapaciteta.",
publisher = "Srpsko društvo za odvodnjavanje i navodnjavanje",
journal = "Vodoprivreda",
title = "Planiranje i razvoj integralnih vodoprivredenih sistema prema načelima ključnih direktiva o vodama EU - na primeru reke Vrbas u Republici Spskoj",
pages = "242-225",
number = "300-302",
volume = "51",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1855"
}

Sudar, N., Blagojević, V., Dašić, T., Đorđević, D., Stanić, M., Jaćimović, N., Đorđević, B., Topalović, Ž., Marilović, S., Cupać, R.,& Bosankić, G.. (2019). Planiranje i razvoj integralnih vodoprivredenih sistema prema načelima ključnih direktiva o vodama EU - na primeru reke Vrbas u Republici Spskoj. in Vodoprivreda
Srpsko društvo za odvodnjavanje i navodnjavanje., 51(300-302), 225-242.
https://hdl.handle.net/21.15107/rcub_grafar_1855

Sudar N, Blagojević V, Dašić T, Đorđević D, Stanić M, Jaćimović N, Đorđević B, Topalović Ž, Marilović S, Cupać R, Bosankić G. Planiranje i razvoj integralnih vodoprivredenih sistema prema načelima ključnih direktiva o vodama EU - na primeru reke Vrbas u Republici Spskoj. in Vodoprivreda. 2019;51(300-302):225-242.
https://hdl.handle.net/21.15107/rcub_grafar_1855 .

Sudar, Nedeljko, Blagojević, Vujadin, Dašić, Tina, Đorđević, Dejana, Stanić, Miloš, Jaćimović, Nenad, Đorđević, Branislav, Topalović, Žana, Marilović, Slobodan, Cupać, Raduška, Bosankić, Goran, "Planiranje i razvoj integralnih vodoprivredenih sistema prema načelima ključnih direktiva o vodama EU - na primeru reke Vrbas u Republici Spskoj" in Vodoprivreda, 51, no. 300-302 (2019):225-242,
https://hdl.handle.net/21.15107/rcub_grafar_1855 .

TY  - CONF
AU  - Đorđević, Dejana
AU  - Ivković, Marija
AU  - Stojnić, Ivan
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1851
AB  - The exchange discharge model (EDM) is the model that was developed for the estimation of a stage-discharge curve and flood routing in compound channels. It was thoroughly tested against experimental data in different compound channel layouts. However, there is a little evidence on its application in rivers. This paper studies EDM performance in estimating stage-discharge curve at two gauging stations on the same river with different hydraulic conditions and compares its results with the traditional, divided channel method (DCM). The contribution of momentum fluxes due to turbulence diffusion and mass exchange to the total energy loss are analysed. It is found that EDM parameter values (ψt and ψg) depend on the hydraulic conditions at a gauging station. In the case of M1-type water surface profile, the ψt-value increases and the
effect of mass transfer is negligible. In the case of M2-type profile, the ψt-value decreases and the momentum flux due to mass transfer becomes dominant. Nonetheless, the lower ψt-value does not result in smaller additional loss due to turbulence diffusion, since the velocity difference between the main channel and the floodplain increases. Although the EDM and DCM provide approximately the same total discharge, EDM gives more realistic discharge distribution (main channel discharge is reduced and that on the floodplain is increased by 30-40% due to mass transfer caused by non-prismaticity of the channel).
PB  - Pª Bajo Virgen del Puerto, 3 28005 Madrid, Spain: International Association for Hydro-Environment Engineering and Research -IAHR-
C3  - E-proceedings of the 38th IAHR World Congress
T1  - On the possibilities of application of exchange discharge model in estimation of a rating curve at a river gauging station
EP  - 2790
SP  - 2783
DO  - 10.3850/38WC092019-0815
ER  - 

@conference{
author = "Đorđević, Dejana and Ivković, Marija and Stojnić, Ivan",
year = "2019",
abstract = "The exchange discharge model (EDM) is the model that was developed for the estimation of a stage-discharge curve and flood routing in compound channels. It was thoroughly tested against experimental data in different compound channel layouts. However, there is a little evidence on its application in rivers. This paper studies EDM performance in estimating stage-discharge curve at two gauging stations on the same river with different hydraulic conditions and compares its results with the traditional, divided channel method (DCM). The contribution of momentum fluxes due to turbulence diffusion and mass exchange to the total energy loss are analysed. It is found that EDM parameter values (ψt and ψg) depend on the hydraulic conditions at a gauging station. In the case of M1-type water surface profile, the ψt-value increases and the
effect of mass transfer is negligible. In the case of M2-type profile, the ψt-value decreases and the momentum flux due to mass transfer becomes dominant. Nonetheless, the lower ψt-value does not result in smaller additional loss due to turbulence diffusion, since the velocity difference between the main channel and the floodplain increases. Although the EDM and DCM provide approximately the same total discharge, EDM gives more realistic discharge distribution (main channel discharge is reduced and that on the floodplain is increased by 30-40% due to mass transfer caused by non-prismaticity of the channel).",
publisher = "Pª Bajo Virgen del Puerto, 3 28005 Madrid, Spain: International Association for Hydro-Environment Engineering and Research -IAHR-",
journal = "E-proceedings of the 38th IAHR World Congress",
title = "On the possibilities of application of exchange discharge model in estimation of a rating curve at a river gauging station",
pages = "2790-2783",
doi = "10.3850/38WC092019-0815"
}

Đorđević, D., Ivković, M.,& Stojnić, I.. (2019). On the possibilities of application of exchange discharge model in estimation of a rating curve at a river gauging station. in E-proceedings of the 38th IAHR World Congress
Pª Bajo Virgen del Puerto, 3 28005 Madrid, Spain: International Association for Hydro-Environment Engineering and Research -IAHR-., 2783-2790.
https://doi.org/10.3850/38WC092019-0815

Đorđević D, Ivković M, Stojnić I. On the possibilities of application of exchange discharge model in estimation of a rating curve at a river gauging station. in E-proceedings of the 38th IAHR World Congress. 2019;:2783-2790.
doi:10.3850/38WC092019-0815 .

Đorđević, Dejana, Ivković, Marija, Stojnić, Ivan, "On the possibilities of application of exchange discharge model in estimation of a rating curve at a river gauging station" in E-proceedings of the 38th IAHR World Congress (2019):2783-2790,
https://doi.org/10.3850/38WC092019-0815 . .

TY  - CONF
AU  - Đorđević, Dejana
AU  - Ivković, Marija
AU  - Stojnić, Ivan
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2293
AB  - U svetu se već dvadeset pet godina razmatraju mogućnosti za poboljšanje procene krive protoka u slučajevima kada se voda izlije iz glavnog korita na plavne površine. Razlog za to je činjenica da su ispitivanja u laboratorijskim uslovima pokazala da se pri visokom stepenu potopljenosti plavnih površina primenom klasičnog pristupa, zasnovanog na podeli korita za veliku vodu na hidraulički homogene segmente i primeni Maningove jednačine, vrednosti protoka precenjuju za više od 60%. Matematički modeli koji su tokom ovog perioda razvijani i/ili unapređivani prvenstveno su proveravani na osnovu merenja u laboratorijskim kanalima u uslovima ustaljenog jednolikog i nejednolikog tečenja. Cilj ovog rada je da se razmotri mogućnost primene jednog od tih modela za procenu krive protoka u koritu za veliku vodu prirodnog vodotoka. Reč je o modelu linijskog tečenja zasnovanom na razmeni količine kretanja između glavnog korita i plavnih površina. Osim razmene količine kretanja turbulentnom difuzijom, ovaj model uzima u obzir i razmenu količine kretanja usled neprizmatičnosti korita, što je jedna od bitnih odlika korita prirodnih vodotoka. Kao primer će poslužiti poprečni presek hidrološke stanice Slovac na reci Kolubari, za koju postoje dostupni podaci osmatranja u domenu velikih voda. Vrednosti protoka koje se dobijaju za najviše zabeležene vodostaje primenom klasičnog pristupa (metode hidraulički homogenih segmenata) i metode razmene količine kretanja uporediće se sa zvaničnim vrednostima RHMZ Srbije.
AB  - The hydraulic engineering community has been making continuous efforts to improve the 
procedure for estimation of a stage discharge curve in a compound channel over the last twenty five years. The reason for this is the fact that tests in laboratory conditions have shown that the classical approach based on the divided channel method, which uses Manning’s equation, overestimates the discharge by more than 60% for high floodplain submergence ratios (> 0.3). Mathematical models that were developed and/or improved during this period were primarily tested using uniform or non-uniform flow data from laboratory flumes. This paper aims at applying one of these models in estimating the stage discharge curve under the flood conditions at one gauging station. More precisely, this will be the exchange discharge model, which is a 1D flow model. Apart from the momentum exchange due to turbulent diffusion, this model also considers the momentum exchange due to mass transfer between the main channel and floodplains, as rivers and streams have non-prismatic channels. The Slovac gauging station on the Kolubara River will be used for the case study, since there are floods observation data for this station available. The discharge values obtained for the highest recorded water levels
using the classical approach (divided channel method) and the exchange discharge method will be compared with the official records of the Republic hydrometeorological service of Serbia.
PB  - Univerzitet u Beogradu – Građevinski fakultet
C3  - Zbornik radova, 18. naučnog savetovanja SDHI i SDH
T1  - Primena modela razmene količine kretanja za procenu krive protoka u koritu za veliku vodu prirodnog vodotoka
T1  - Application of the exchange discharge model for the estimation of the rating curve in the compound channel – a case study
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2293
ER  - 

@conference{
author = "Đorđević, Dejana and Ivković, Marija and Stojnić, Ivan",
year = "2018",
abstract = "U svetu se već dvadeset pet godina razmatraju mogućnosti za poboljšanje procene krive protoka u slučajevima kada se voda izlije iz glavnog korita na plavne površine. Razlog za to je činjenica da su ispitivanja u laboratorijskim uslovima pokazala da se pri visokom stepenu potopljenosti plavnih površina primenom klasičnog pristupa, zasnovanog na podeli korita za veliku vodu na hidraulički homogene segmente i primeni Maningove jednačine, vrednosti protoka precenjuju za više od 60%. Matematički modeli koji su tokom ovog perioda razvijani i/ili unapređivani prvenstveno su proveravani na osnovu merenja u laboratorijskim kanalima u uslovima ustaljenog jednolikog i nejednolikog tečenja. Cilj ovog rada je da se razmotri mogućnost primene jednog od tih modela za procenu krive protoka u koritu za veliku vodu prirodnog vodotoka. Reč je o modelu linijskog tečenja zasnovanom na razmeni količine kretanja između glavnog korita i plavnih površina. Osim razmene količine kretanja turbulentnom difuzijom, ovaj model uzima u obzir i razmenu količine kretanja usled neprizmatičnosti korita, što je jedna od bitnih odlika korita prirodnih vodotoka. Kao primer će poslužiti poprečni presek hidrološke stanice Slovac na reci Kolubari, za koju postoje dostupni podaci osmatranja u domenu velikih voda. Vrednosti protoka koje se dobijaju za najviše zabeležene vodostaje primenom klasičnog pristupa (metode hidraulički homogenih segmenata) i metode razmene količine kretanja uporediće se sa zvaničnim vrednostima RHMZ Srbije., The hydraulic engineering community has been making continuous efforts to improve the 
procedure for estimation of a stage discharge curve in a compound channel over the last twenty five years. The reason for this is the fact that tests in laboratory conditions have shown that the classical approach based on the divided channel method, which uses Manning’s equation, overestimates the discharge by more than 60% for high floodplain submergence ratios (> 0.3). Mathematical models that were developed and/or improved during this period were primarily tested using uniform or non-uniform flow data from laboratory flumes. This paper aims at applying one of these models in estimating the stage discharge curve under the flood conditions at one gauging station. More precisely, this will be the exchange discharge model, which is a 1D flow model. Apart from the momentum exchange due to turbulent diffusion, this model also considers the momentum exchange due to mass transfer between the main channel and floodplains, as rivers and streams have non-prismatic channels. The Slovac gauging station on the Kolubara River will be used for the case study, since there are floods observation data for this station available. The discharge values obtained for the highest recorded water levels
using the classical approach (divided channel method) and the exchange discharge method will be compared with the official records of the Republic hydrometeorological service of Serbia.",
publisher = "Univerzitet u Beogradu – Građevinski fakultet",
journal = "Zbornik radova, 18. naučnog savetovanja SDHI i SDH",
title = "Primena modela razmene količine kretanja za procenu krive protoka u koritu za veliku vodu prirodnog vodotoka, Application of the exchange discharge model for the estimation of the rating curve in the compound channel – a case study",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2293"
}

Đorđević, D., Ivković, M.,& Stojnić, I.. (2018). Primena modela razmene količine kretanja za procenu krive protoka u koritu za veliku vodu prirodnog vodotoka. in Zbornik radova, 18. naučnog savetovanja SDHI i SDH
Univerzitet u Beogradu – Građevinski fakultet..
https://hdl.handle.net/21.15107/rcub_grafar_2293

Đorđević D, Ivković M, Stojnić I. Primena modela razmene količine kretanja za procenu krive protoka u koritu za veliku vodu prirodnog vodotoka. in Zbornik radova, 18. naučnog savetovanja SDHI i SDH. 2018;.
https://hdl.handle.net/21.15107/rcub_grafar_2293 .

Đorđević, Dejana, Ivković, Marija, Stojnić, Ivan, "Primena modela razmene količine kretanja za procenu krive protoka u koritu za veliku vodu prirodnog vodotoka" in Zbornik radova, 18. naučnog savetovanja SDHI i SDH (2018),
https://hdl.handle.net/21.15107/rcub_grafar_2293 .

TY  - CONF
AU  - Đorđević, Dejana
AU  - Stojnić, Ivan
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1856
AB  - Parameters of 1D confluence models are originally defined for concordant beds’ (CB’s) confluences. This paper aims at estimating these parameters for discordant beds’ confluences using numerical simulation results of 3D flow. A 3D finite-volume based model SSIIM2 that was successfully  validated in CB’s confluences is applied in this study, too. Confluences with the low,moderate and maximal observed bed elevation discordance ratio values are analysed for three characteristic hydrological scenarios: dominance of the tributary flow, equal contributions of the combining flows and dominance of the main-river flow. It is shown that: 1) the mean flow angle δ approaches junction angle α with the increase in bed elevation discordance, especially when tributary flow dominates, 2) the value of Hager’s correction coefficient σ is not constant and 3) the contribution of the tributary flow to the 1D momentum equation is under predicted when either parameter δ or σ is used for its estimation.
PB  - CRC Press, Taylor & Francis Group
C3  - Sustainable hydraulics in the era of global change, Proceedings of the 4th IAHR Europe Congress (Liege, Belgium, 27-29 July 2016) , Advances in water engineering and research
T1  - Estimation of 1D-confluence model parameters in right-angled discordant beds’ confluences using 3D numerical model
EP  - 690
SP  - 684
DO  - 10.1201/b21902
ER  - 

@conference{
author = "Đorđević, Dejana and Stojnić, Ivan",
year = "2018",
abstract = "Parameters of 1D confluence models are originally defined for concordant beds’ (CB’s) confluences. This paper aims at estimating these parameters for discordant beds’ confluences using numerical simulation results of 3D flow. A 3D finite-volume based model SSIIM2 that was successfully  validated in CB’s confluences is applied in this study, too. Confluences with the low,moderate and maximal observed bed elevation discordance ratio values are analysed for three characteristic hydrological scenarios: dominance of the tributary flow, equal contributions of the combining flows and dominance of the main-river flow. It is shown that: 1) the mean flow angle δ approaches junction angle α with the increase in bed elevation discordance, especially when tributary flow dominates, 2) the value of Hager’s correction coefficient σ is not constant and 3) the contribution of the tributary flow to the 1D momentum equation is under predicted when either parameter δ or σ is used for its estimation.",
publisher = "CRC Press, Taylor & Francis Group",
journal = "Sustainable hydraulics in the era of global change, Proceedings of the 4th IAHR Europe Congress (Liege, Belgium, 27-29 July 2016) , Advances in water engineering and research",
title = "Estimation of 1D-confluence model parameters in right-angled discordant beds’ confluences using 3D numerical model",
pages = "690-684",
doi = "10.1201/b21902"
}

Đorđević, D.,& Stojnić, I.. (2018). Estimation of 1D-confluence model parameters in right-angled discordant beds’ confluences using 3D numerical model. in Sustainable hydraulics in the era of global change, Proceedings of the 4th IAHR Europe Congress (Liege, Belgium, 27-29 July 2016) , Advances in water engineering and research
CRC Press, Taylor & Francis Group., 684-690.
https://doi.org/10.1201/b21902

Đorđević D, Stojnić I. Estimation of 1D-confluence model parameters in right-angled discordant beds’ confluences using 3D numerical model. in Sustainable hydraulics in the era of global change, Proceedings of the 4th IAHR Europe Congress (Liege, Belgium, 27-29 July 2016) , Advances in water engineering and research. 2018;:684-690.
doi:10.1201/b21902 .

Đorđević, Dejana, Stojnić, Ivan, "Estimation of 1D-confluence model parameters in right-angled discordant beds’ confluences using 3D numerical model" in Sustainable hydraulics in the era of global change, Proceedings of the 4th IAHR Europe Congress (Liege, Belgium, 27-29 July 2016) , Advances in water engineering and research (2018):684-690,
https://doi.org/10.1201/b21902 . .

TY  - CONF
AU  - Đorđević, Dejana
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2294
AB  - The paper studies the effect of bed elevation discordance on the hydrodynamics in fixed-bed open channel 
confluences where the tributary channel is narrower than the main channel and where the flow is subcritical. The
study is inspired by two facts: 1) that the main river is wider than the tributary in majority of cases and 2) that the 
bed elevation discordance is a usual morphological feature in alluvial river confluences. To this aim nine
confluence layouts with three channel width ratios BT / BMR = {1.00, 0.75, 0.50} and three extents of bed 
elevation discordance ΔzT / hd  = {0.10, 0.25, 0.50} are analysed under the three possible hydrological scenarios
defined by the discharge ratio values DR = QMR / Qtot ={0.250, 0.583, 0.750}. It is found that: 1) the tributary flow 
acts as a jet when DR = 0.250 regardless of the BT / BMR and ΔzT / hd  values, 2) the recirculation zone with several 
vortices exists throughout the flow depth when DR = 0.250 and BT  < BMR, 3) the primary vortex is shifted farther 
downstream and the secondary one is inclined and attached to the boundary streamline, 4) the strong shear exists
both in the horizontal and vertical planes and 5) the shear layer is developed on each side of the inclined 
recirculation zone.
PB  - EGE University, Izmir, Turkey
C3  - Proceedings of 13th International Congress on Advances in Civil Engineering
T1  - On the effect of bed elevation discordance in confluences with unequal channel widths
EP  - 8
SP  - 1/84693
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2294
ER  - 

@conference{
author = "Đorđević, Dejana",
year = "2018",
abstract = "The paper studies the effect of bed elevation discordance on the hydrodynamics in fixed-bed open channel 
confluences where the tributary channel is narrower than the main channel and where the flow is subcritical. The
study is inspired by two facts: 1) that the main river is wider than the tributary in majority of cases and 2) that the 
bed elevation discordance is a usual morphological feature in alluvial river confluences. To this aim nine
confluence layouts with three channel width ratios BT / BMR = {1.00, 0.75, 0.50} and three extents of bed 
elevation discordance ΔzT / hd  = {0.10, 0.25, 0.50} are analysed under the three possible hydrological scenarios
defined by the discharge ratio values DR = QMR / Qtot ={0.250, 0.583, 0.750}. It is found that: 1) the tributary flow 
acts as a jet when DR = 0.250 regardless of the BT / BMR and ΔzT / hd  values, 2) the recirculation zone with several 
vortices exists throughout the flow depth when DR = 0.250 and BT  < BMR, 3) the primary vortex is shifted farther 
downstream and the secondary one is inclined and attached to the boundary streamline, 4) the strong shear exists
both in the horizontal and vertical planes and 5) the shear layer is developed on each side of the inclined 
recirculation zone.",
publisher = "EGE University, Izmir, Turkey",
journal = "Proceedings of 13th International Congress on Advances in Civil Engineering",
title = "On the effect of bed elevation discordance in confluences with unequal channel widths",
pages = "8-1/84693",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2294"
}

Đorđević, D.. (2018). On the effect of bed elevation discordance in confluences with unequal channel widths. in Proceedings of 13th International Congress on Advances in Civil Engineering
EGE University, Izmir, Turkey., 1/84693-8.
https://hdl.handle.net/21.15107/rcub_grafar_2294

Đorđević D. On the effect of bed elevation discordance in confluences with unequal channel widths. in Proceedings of 13th International Congress on Advances in Civil Engineering. 2018;:1/84693-8.
https://hdl.handle.net/21.15107/rcub_grafar_2294 .

Đorđević, Dejana, "On the effect of bed elevation discordance in confluences with unequal channel widths" in Proceedings of 13th International Congress on Advances in Civil Engineering (2018):1/84693-8,
https://hdl.handle.net/21.15107/rcub_grafar_2294 .