TY  - JOUR
AU  - Ljubičić, Robert
AU  - Dal Sasso, Silvano Fortunato
AU  - Zindović, Budo
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3374
AB  - Image-based hydrological measurement techniques have surged in popularity over the last decade, with the most common type of data obtained being the open-channel surface velocity field and flow rate. The lack of a feature-rich image velocimetry software often forces practitioners to use multiple tools as part of a cumbersome workflow, which restricts the uptake of such methods and reduces the reproducibility of results. We present the free and open-source software SSIMS-Flow, which handles extraction of video frames, removal of geometric distortions, video stabilization, orthorectification, image enhancement, and velocity and flow rate estimation using the Farnebäck optical flow method improved with specific pooling techniques developed in this study. SSIMS-Flow performance is tested in two case studies and compared with direct reference values and those obtained using industry-standard PIVlab software. In low seeding and tracerless conditions, SSIMS-Flow demonstrates higher velocity estimation accuracy, while delivering several times faster computational runtime.
PB  - Elsevier
T2  - Environmental Modelling and Software
T1  - SSIMS-Flow: Image velocimetry workbench for open-channel flow rate estimation
DO  - 10.1016/j.envsoft.2023.105938
ER  - 

@article{
author = "Ljubičić, Robert and Dal Sasso, Silvano Fortunato and Zindović, Budo",
year = "2023",
abstract = "Image-based hydrological measurement techniques have surged in popularity over the last decade, with the most common type of data obtained being the open-channel surface velocity field and flow rate. The lack of a feature-rich image velocimetry software often forces practitioners to use multiple tools as part of a cumbersome workflow, which restricts the uptake of such methods and reduces the reproducibility of results. We present the free and open-source software SSIMS-Flow, which handles extraction of video frames, removal of geometric distortions, video stabilization, orthorectification, image enhancement, and velocity and flow rate estimation using the Farnebäck optical flow method improved with specific pooling techniques developed in this study. SSIMS-Flow performance is tested in two case studies and compared with direct reference values and those obtained using industry-standard PIVlab software. In low seeding and tracerless conditions, SSIMS-Flow demonstrates higher velocity estimation accuracy, while delivering several times faster computational runtime.",
publisher = "Elsevier",
journal = "Environmental Modelling and Software",
title = "SSIMS-Flow: Image velocimetry workbench for open-channel flow rate estimation",
doi = "10.1016/j.envsoft.2023.105938"
}

Ljubičić, R., Dal Sasso, S. F.,& Zindović, B.. (2023). SSIMS-Flow: Image velocimetry workbench for open-channel flow rate estimation. in Environmental Modelling and Software
Elsevier..
https://doi.org/10.1016/j.envsoft.2023.105938

Ljubičić R, Dal Sasso SF, Zindović B. SSIMS-Flow: Image velocimetry workbench for open-channel flow rate estimation. in Environmental Modelling and Software. 2023;.
doi:10.1016/j.envsoft.2023.105938 .

Ljubičić, Robert, Dal Sasso, Silvano Fortunato, Zindović, Budo, "SSIMS-Flow: Image velocimetry workbench for open-channel flow rate estimation" in Environmental Modelling and Software (2023),
https://doi.org/10.1016/j.envsoft.2023.105938 . .

TY  - CONF
AU  - Ivetić, Damjan
AU  - Ljubičić, Robert
AU  - Milašinović, Miloš
AU  - Prodanović, Dušan
AU  - Pavlović, Dragutin
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3222
AB  - Jedan od preduslova za efikasno upravljanje i strateško planiranje razvoja kanalizacionih sistema je dobro poznavanje dinamike rada mreže. Ključnu ulogu imaju mereni podaci, prvenstveno o promenama protoka i nivoa, kako u sušnom tako i u kišnom period. Nažalost, kanalizacione mreže su u većini slučajeva slabo pokrivene adekvatnim mernim mestima. Tako prilikom planiranja kapitalnih investicija, npr. postrojenja za prečišćavanje otpadnih voda, nedostajući podaci se obezbeđuju kroz merne kampanje. Ključni izazovi pri sprovođenju mernih kampanja su povezani sa lokacijski i hidraulički nepovoljnim mernim lokacijama, koje negativno utiču na kvalitet izmerenih podataka. U ovom radu je prikazan primer kombinovanja inovativnih sa konvencionalnim metodama za merenja protoka u kanalizacionim sistemima sa ciljem dobijanja reprezentativnih podataka u složenim mernim uslovima.
AB  - One of the prerequisites for efficient management and development planning of the sewer systems is the adequate knowledge of network dynamics. Measured data play a key role, mainly the flow rate and level variations in dry and wet periods. Unfortunately, sewer networks are commonly scarcely covered with measurement systems. Thus, when capital investments are planned, e.g. wastewater treatment plants (WWTP), missing data is acquired through measurement campaigns. Challenges in the execution of the measurement campaigns are mostly correlated to hydraulically and organizationally unfavorable measurement locations, reflecting negatively on the quality of the measured data. In this paper, an example of the combination of the innovative and conventional flow measurement methods in sewer networks is shown, to allow for the acquisition of the representative data in complex measurement conditions.
PB  - Savez inženjera i tehničara Srbije
C3  - 44. međunarodna konferencija "Vodovod i kanalizacija '23", Zlatibor, 10-13. oktobar 2023.
T1  - Merenje protoka otpadnih voda u kanalizacionim mrežama: Kombinovanje inovativnih sa konvencionalnim mernim metodama
T1  - Wastewater flow measurements in sewer networks: Combining innovative and conventional measurement methods
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3222
ER  - 

@conference{
author = "Ivetić, Damjan and Ljubičić, Robert and Milašinović, Miloš and Prodanović, Dušan and Pavlović, Dragutin",
year = "2023",
abstract = "Jedan od preduslova za efikasno upravljanje i strateško planiranje razvoja kanalizacionih sistema je dobro poznavanje dinamike rada mreže. Ključnu ulogu imaju mereni podaci, prvenstveno o promenama protoka i nivoa, kako u sušnom tako i u kišnom period. Nažalost, kanalizacione mreže su u većini slučajeva slabo pokrivene adekvatnim mernim mestima. Tako prilikom planiranja kapitalnih investicija, npr. postrojenja za prečišćavanje otpadnih voda, nedostajući podaci se obezbeđuju kroz merne kampanje. Ključni izazovi pri sprovođenju mernih kampanja su povezani sa lokacijski i hidraulički nepovoljnim mernim lokacijama, koje negativno utiču na kvalitet izmerenih podataka. U ovom radu je prikazan primer kombinovanja inovativnih sa konvencionalnim metodama za merenja protoka u kanalizacionim sistemima sa ciljem dobijanja reprezentativnih podataka u složenim mernim uslovima., One of the prerequisites for efficient management and development planning of the sewer systems is the adequate knowledge of network dynamics. Measured data play a key role, mainly the flow rate and level variations in dry and wet periods. Unfortunately, sewer networks are commonly scarcely covered with measurement systems. Thus, when capital investments are planned, e.g. wastewater treatment plants (WWTP), missing data is acquired through measurement campaigns. Challenges in the execution of the measurement campaigns are mostly correlated to hydraulically and organizationally unfavorable measurement locations, reflecting negatively on the quality of the measured data. In this paper, an example of the combination of the innovative and conventional flow measurement methods in sewer networks is shown, to allow for the acquisition of the representative data in complex measurement conditions.",
publisher = "Savez inženjera i tehničara Srbije",
journal = "44. međunarodna konferencija "Vodovod i kanalizacija '23", Zlatibor, 10-13. oktobar 2023.",
title = "Merenje protoka otpadnih voda u kanalizacionim mrežama: Kombinovanje inovativnih sa konvencionalnim mernim metodama, Wastewater flow measurements in sewer networks: Combining innovative and conventional measurement methods",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3222"
}

Ivetić, D., Ljubičić, R., Milašinović, M., Prodanović, D.,& Pavlović, D.. (2023). Merenje protoka otpadnih voda u kanalizacionim mrežama: Kombinovanje inovativnih sa konvencionalnim mernim metodama. in 44. međunarodna konferencija "Vodovod i kanalizacija '23", Zlatibor, 10-13. oktobar 2023.
Savez inženjera i tehničara Srbije..
https://hdl.handle.net/21.15107/rcub_grafar_3222

Ivetić D, Ljubičić R, Milašinović M, Prodanović D, Pavlović D. Merenje protoka otpadnih voda u kanalizacionim mrežama: Kombinovanje inovativnih sa konvencionalnim mernim metodama. in 44. međunarodna konferencija "Vodovod i kanalizacija '23", Zlatibor, 10-13. oktobar 2023.. 2023;.
https://hdl.handle.net/21.15107/rcub_grafar_3222 .

Ivetić, Damjan, Ljubičić, Robert, Milašinović, Miloš, Prodanović, Dušan, Pavlović, Dragutin, "Merenje protoka otpadnih voda u kanalizacionim mrežama: Kombinovanje inovativnih sa konvencionalnim mernim metodama" in 44. međunarodna konferencija "Vodovod i kanalizacija '23", Zlatibor, 10-13. oktobar 2023. (2023),
https://hdl.handle.net/21.15107/rcub_grafar_3222 .

TY  - CHAP
AU  - Peña-Haro, Salvador
AU  - Ljubičić, Robert
AU  - Strelnikova, Dariia
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3184
PB  - Elsevier
T2  - Unmanned Aerial Systems for Monitoring Soil, Vegetation, and Riverine Environments
T1  - Geometric correction and stabilization of images collected by UASs in river monitoring
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3184
ER  - 

@inbook{
author = "Peña-Haro, Salvador and Ljubičić, Robert and Strelnikova, Dariia",
year = "2023",
publisher = "Elsevier",
journal = "Unmanned Aerial Systems for Monitoring Soil, Vegetation, and Riverine Environments",
booktitle = "Geometric correction and stabilization of images collected by UASs in river monitoring",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3184"
}

Peña-Haro, S., Ljubičić, R.,& Strelnikova, D.. (2023). Geometric correction and stabilization of images collected by UASs in river monitoring. in Unmanned Aerial Systems for Monitoring Soil, Vegetation, and Riverine Environments
Elsevier..
https://hdl.handle.net/21.15107/rcub_grafar_3184

Peña-Haro S, Ljubičić R, Strelnikova D. Geometric correction and stabilization of images collected by UASs in river monitoring. in Unmanned Aerial Systems for Monitoring Soil, Vegetation, and Riverine Environments. 2023;.
https://hdl.handle.net/21.15107/rcub_grafar_3184 .

Peña-Haro, Salvador, Ljubičić, Robert, Strelnikova, Dariia, "Geometric correction and stabilization of images collected by UASs in river monitoring" in Unmanned Aerial Systems for Monitoring Soil, Vegetation, and Riverine Environments (2023),
https://hdl.handle.net/21.15107/rcub_grafar_3184 .

TY  - CONF
AU  - Ivetić, Damjan
AU  - Ljubičić, Robert
AU  - Milašinović, Miloš
AU  - Pavlović, Dragutin
AU  - Prodanović, Dušan
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3112
AB  - Upravljanje kanalizacionim sistemima se zasniva na poznavanju rada mreže. Podaci o radu mreže uglavnom su skromnog obima. Usled ograničenih budžeta, komunalna preduzeća retko investiraju u formiranju stalnih mernih mesta. Prilikom planiranja kapitalnih investicija, npr. postrojenja za prečišćavanje otpadnih voda, nedostajući podaci se obezbeđuju kratkoročnim mernim kampanjama na privremenim mernim mestima. Problemi su povezani lokacijski i hidraulički nepovoljnim mernim mestima  Izvođači merenja kombinuju merne metode i tehnologije, ili primenjuju inovativna rešenja obezbeđujući zadovoljavajući kvalitet ipodataka. U radu su prikazana inovativna rešenja osmišljena na Institutu za hidrotehniku i vodno ekološko inženjerstvo Građevinskog fakulteta Univerziteta u Beogradu na kampanji merenja u kanalizacionim sistemima Inđije, Stare Pazove i Novih Banovaca.
PB  - Udruženje za tehnologijiu vode i sanitarno inženjerstvo
C3  - Konferencija "Vodovodni i kanalizacioni sistemi 2023"
T1  - Primena inovativnih rešenja za merenja protoka u kanalizacionim mrežama: Iskustva stečena u Inđiji, Staroj Pazovi i Novim Banovcima
EP  - 106
SP  - 95
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3112
ER  - 

@conference{
author = "Ivetić, Damjan and Ljubičić, Robert and Milašinović, Miloš and Pavlović, Dragutin and Prodanović, Dušan",
year = "2023",
abstract = "Upravljanje kanalizacionim sistemima se zasniva na poznavanju rada mreže. Podaci o radu mreže uglavnom su skromnog obima. Usled ograničenih budžeta, komunalna preduzeća retko investiraju u formiranju stalnih mernih mesta. Prilikom planiranja kapitalnih investicija, npr. postrojenja za prečišćavanje otpadnih voda, nedostajući podaci se obezbeđuju kratkoročnim mernim kampanjama na privremenim mernim mestima. Problemi su povezani lokacijski i hidraulički nepovoljnim mernim mestima  Izvođači merenja kombinuju merne metode i tehnologije, ili primenjuju inovativna rešenja obezbeđujući zadovoljavajući kvalitet ipodataka. U radu su prikazana inovativna rešenja osmišljena na Institutu za hidrotehniku i vodno ekološko inženjerstvo Građevinskog fakulteta Univerziteta u Beogradu na kampanji merenja u kanalizacionim sistemima Inđije, Stare Pazove i Novih Banovaca.",
publisher = "Udruženje za tehnologijiu vode i sanitarno inženjerstvo",
journal = "Konferencija "Vodovodni i kanalizacioni sistemi 2023"",
title = "Primena inovativnih rešenja za merenja protoka u kanalizacionim mrežama: Iskustva stečena u Inđiji, Staroj Pazovi i Novim Banovcima",
pages = "106-95",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3112"
}

Ivetić, D., Ljubičić, R., Milašinović, M., Pavlović, D.,& Prodanović, D.. (2023). Primena inovativnih rešenja za merenja protoka u kanalizacionim mrežama: Iskustva stečena u Inđiji, Staroj Pazovi i Novim Banovcima. in Konferencija "Vodovodni i kanalizacioni sistemi 2023"
Udruženje za tehnologijiu vode i sanitarno inženjerstvo., 95-106.
https://hdl.handle.net/21.15107/rcub_grafar_3112

Ivetić D, Ljubičić R, Milašinović M, Pavlović D, Prodanović D. Primena inovativnih rešenja za merenja protoka u kanalizacionim mrežama: Iskustva stečena u Inđiji, Staroj Pazovi i Novim Banovcima. in Konferencija "Vodovodni i kanalizacioni sistemi 2023". 2023;:95-106.
https://hdl.handle.net/21.15107/rcub_grafar_3112 .

Ivetić, Damjan, Ljubičić, Robert, Milašinović, Miloš, Pavlović, Dragutin, Prodanović, Dušan, "Primena inovativnih rešenja za merenja protoka u kanalizacionim mrežama: Iskustva stečena u Inđiji, Staroj Pazovi i Novim Banovcima" in Konferencija "Vodovodni i kanalizacioni sistemi 2023" (2023):95-106,
https://hdl.handle.net/21.15107/rcub_grafar_3112 .

TY  - CONF
AU  - Ljubičić, Robert
AU  - Ivetić, Damjan
AU  - Milašinović, Miloš
AU  - Pavlović, Dragutin
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3111
AB  - Tehnike merenja u hidrotehnici zasnovane na upotrebi kamera i naknadnoj obradi video zapisa u trendu su poslednje dve decenije. Odlikuju ih tehnička jednostavnost, niska cena i prilagodljivost hardvera i softvera. Međutim, primena za merenje protoka u kanalizacionim sistemima nije analizirana u literaturi. Tim Građevinskog fakulteta Univerziteta u Beogradu osmislio je, konstruisao i postavio merni uređaj, baterijski napajan mikroračunar sa IC kamerom u kanalizacioni šaht u naselju Novi Banovci radi kontinualnog merenja dotoka upotrebljene vode. Rad prikazuje specifičnosti upotrebe mernog uređaja i tehnike obrade video zapisa. Preliminarni rezultati pokazuju potencijal razvijene metodologije, posebno tamo gde konvencionalna oprema nije primenjiva.
PB  - Udruženje za tehnologijiu vode i sanitarno inženjerstvo
C3  - Konferencija "Vodovodni i kanalizacioni sistemi 2023"
T1  - Primena kamera i tehnika obrade video zapisa za procenu protoka u kanalizacionim sistemima - iskustva merne kampanje Novi Banovci
EP  - 129
SP  - 117
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3111
ER  - 

@conference{
author = "Ljubičić, Robert and Ivetić, Damjan and Milašinović, Miloš and Pavlović, Dragutin",
year = "2023",
abstract = "Tehnike merenja u hidrotehnici zasnovane na upotrebi kamera i naknadnoj obradi video zapisa u trendu su poslednje dve decenije. Odlikuju ih tehnička jednostavnost, niska cena i prilagodljivost hardvera i softvera. Međutim, primena za merenje protoka u kanalizacionim sistemima nije analizirana u literaturi. Tim Građevinskog fakulteta Univerziteta u Beogradu osmislio je, konstruisao i postavio merni uređaj, baterijski napajan mikroračunar sa IC kamerom u kanalizacioni šaht u naselju Novi Banovci radi kontinualnog merenja dotoka upotrebljene vode. Rad prikazuje specifičnosti upotrebe mernog uređaja i tehnike obrade video zapisa. Preliminarni rezultati pokazuju potencijal razvijene metodologije, posebno tamo gde konvencionalna oprema nije primenjiva.",
publisher = "Udruženje za tehnologijiu vode i sanitarno inženjerstvo",
journal = "Konferencija "Vodovodni i kanalizacioni sistemi 2023"",
title = "Primena kamera i tehnika obrade video zapisa za procenu protoka u kanalizacionim sistemima - iskustva merne kampanje Novi Banovci",
pages = "129-117",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3111"
}

Ljubičić, R., Ivetić, D., Milašinović, M.,& Pavlović, D.. (2023). Primena kamera i tehnika obrade video zapisa za procenu protoka u kanalizacionim sistemima - iskustva merne kampanje Novi Banovci. in Konferencija "Vodovodni i kanalizacioni sistemi 2023"
Udruženje za tehnologijiu vode i sanitarno inženjerstvo., 117-129.
https://hdl.handle.net/21.15107/rcub_grafar_3111

Ljubičić R, Ivetić D, Milašinović M, Pavlović D. Primena kamera i tehnika obrade video zapisa za procenu protoka u kanalizacionim sistemima - iskustva merne kampanje Novi Banovci. in Konferencija "Vodovodni i kanalizacioni sistemi 2023". 2023;:117-129.
https://hdl.handle.net/21.15107/rcub_grafar_3111 .

Ljubičić, Robert, Ivetić, Damjan, Milašinović, Miloš, Pavlović, Dragutin, "Primena kamera i tehnika obrade video zapisa za procenu protoka u kanalizacionim sistemima - iskustva merne kampanje Novi Banovci" in Konferencija "Vodovodni i kanalizacioni sistemi 2023" (2023):117-129,
https://hdl.handle.net/21.15107/rcub_grafar_3111 .

TY  - JOUR
AU  - Ljubičić, Robert
AU  - Zindović, Budo
AU  - Rosić, Nikola
AU  - Pavlović, Dragutin
PY  - 2022
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2818
AB  - Merenje protoka u otvorenim kanalima često je dugotrajan, invazivan, složen i skup poduhvat, koji neretko uključuje veći broj naročito obučenih rukovaoca opremom, i različite naknadne obrade podataka sa terena. Razvoj tehnologije lakih bespilotnih letelica opremljenih kamerama omogućio je alternativan pristup posrednog merenja protoka putem analize polja površinskih brzina u otvorenom toku. Iako merenja ovom metodom pružaju podatke više merne neizvesnosti od konvencionalnih mernih metoda, opisana procedura beskontaktnog merenja protoka je (1) vremenski efikasnija, (2) zahteva manji broj rukovaoca opremom, (3) primenjiva čak i u određenim uslovima u kojima konvencionalne metode nisu i (4) otvara mogućnost automatizovanog i autonomnog monitoringa vodotoka. Procedura hidrometrijske analize video zapisa još uvek nije standardizovana, i na tržištu se teško pronalazi alat koji uspešno obavlja sve korake neophodne za dobijanje podataka o brzinama i protoku. Alat SSIMS-Flow razvijen je sa ciljem da omogući lak pristup različitim koracima pripreme i procesiranja podataka iz video zapisa u sveobuhvatnom procesu – od pripreme „sirovog“ video zapisa do procene vrednosti protoka – čime se drastično pojednostavljuje primena opisane metoda merenja.
AB  - Open-channel flow rate measurement is often a time consuming, invasive, complex, and expensive procedure, which frequently requires involvement of multiple equipment operators and various postprocessing techniques. The development of camera-equipped lightweight unmanned aerial vehicles has enabled an alternative approach of indirect flow rate measurement by analyzing the surface flow velocities. Although the data acquired by this approach experiences somewhat higher measurement uncertainty than that of conventional measurement techniques, such non-contact measurement method is (1) more time efficient, (2) requires fewer operators, (3) can be applied in certain conditions when conventional methods are unfeasible, and (4) allows for automated and autonomous flow monitoring. Hydrometric analyses of video footage are still unstandardized, and finding a suitable tool which successfully deals with all the necessary actions for velocity and flow estimation has proven to be difficult. SSIMS-Flow tool is developed with the aim of providing easy access to different actions of video footage data preparation and processing to enable a holistic process – from preparing a “raw” video footage to the estimation of flow rate – which drastically simplifies the described approach.
PB  - Jugoslovensko društvo za odvodnjavanje i navodnjavanje, Beograd
T2  - Vodoprivreda
T1  - SSIMS-FLOW: Alat za procenu protoka u otvorenim tokovima na osnovu polja površinskih brzina iz video zapisa sa lakih bespilotnih letilica
T1  - SSIMS-FLOW: Flow Rate Estimation Tool Using Surface Velocity Imagery From Unmanned Aerial Vehicles
EP  - 139
IS  - 317-318
SP  - 123
VL  - 54
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2818
ER  - 

@article{
author = "Ljubičić, Robert and Zindović, Budo and Rosić, Nikola and Pavlović, Dragutin",
year = "2022",
abstract = "Merenje protoka u otvorenim kanalima često je dugotrajan, invazivan, složen i skup poduhvat, koji neretko uključuje veći broj naročito obučenih rukovaoca opremom, i različite naknadne obrade podataka sa terena. Razvoj tehnologije lakih bespilotnih letelica opremljenih kamerama omogućio je alternativan pristup posrednog merenja protoka putem analize polja površinskih brzina u otvorenom toku. Iako merenja ovom metodom pružaju podatke više merne neizvesnosti od konvencionalnih mernih metoda, opisana procedura beskontaktnog merenja protoka je (1) vremenski efikasnija, (2) zahteva manji broj rukovaoca opremom, (3) primenjiva čak i u određenim uslovima u kojima konvencionalne metode nisu i (4) otvara mogućnost automatizovanog i autonomnog monitoringa vodotoka. Procedura hidrometrijske analize video zapisa još uvek nije standardizovana, i na tržištu se teško pronalazi alat koji uspešno obavlja sve korake neophodne za dobijanje podataka o brzinama i protoku. Alat SSIMS-Flow razvijen je sa ciljem da omogući lak pristup različitim koracima pripreme i procesiranja podataka iz video zapisa u sveobuhvatnom procesu – od pripreme „sirovog“ video zapisa do procene vrednosti protoka – čime se drastično pojednostavljuje primena opisane metoda merenja., Open-channel flow rate measurement is often a time consuming, invasive, complex, and expensive procedure, which frequently requires involvement of multiple equipment operators and various postprocessing techniques. The development of camera-equipped lightweight unmanned aerial vehicles has enabled an alternative approach of indirect flow rate measurement by analyzing the surface flow velocities. Although the data acquired by this approach experiences somewhat higher measurement uncertainty than that of conventional measurement techniques, such non-contact measurement method is (1) more time efficient, (2) requires fewer operators, (3) can be applied in certain conditions when conventional methods are unfeasible, and (4) allows for automated and autonomous flow monitoring. Hydrometric analyses of video footage are still unstandardized, and finding a suitable tool which successfully deals with all the necessary actions for velocity and flow estimation has proven to be difficult. SSIMS-Flow tool is developed with the aim of providing easy access to different actions of video footage data preparation and processing to enable a holistic process – from preparing a “raw” video footage to the estimation of flow rate – which drastically simplifies the described approach.",
publisher = "Jugoslovensko društvo za odvodnjavanje i navodnjavanje, Beograd",
journal = "Vodoprivreda",
title = "SSIMS-FLOW: Alat za procenu protoka u otvorenim tokovima na osnovu polja površinskih brzina iz video zapisa sa lakih bespilotnih letilica, SSIMS-FLOW: Flow Rate Estimation Tool Using Surface Velocity Imagery From Unmanned Aerial Vehicles",
pages = "139-123",
number = "317-318",
volume = "54",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2818"
}

Ljubičić, R., Zindović, B., Rosić, N.,& Pavlović, D.. (2022). SSIMS-FLOW: Alat za procenu protoka u otvorenim tokovima na osnovu polja površinskih brzina iz video zapisa sa lakih bespilotnih letilica. in Vodoprivreda
Jugoslovensko društvo za odvodnjavanje i navodnjavanje, Beograd., 54(317-318), 123-139.
https://hdl.handle.net/21.15107/rcub_grafar_2818

Ljubičić R, Zindović B, Rosić N, Pavlović D. SSIMS-FLOW: Alat za procenu protoka u otvorenim tokovima na osnovu polja površinskih brzina iz video zapisa sa lakih bespilotnih letilica. in Vodoprivreda. 2022;54(317-318):123-139.
https://hdl.handle.net/21.15107/rcub_grafar_2818 .

Ljubičić, Robert, Zindović, Budo, Rosić, Nikola, Pavlović, Dragutin, "SSIMS-FLOW: Alat za procenu protoka u otvorenim tokovima na osnovu polja površinskih brzina iz video zapisa sa lakih bespilotnih letilica" in Vodoprivreda, 54, no. 317-318 (2022):123-139,
https://hdl.handle.net/21.15107/rcub_grafar_2818 .

TY  - GEN
AU  - Ljubičić, Robert
AU  - Vićanović, Ivana
AU  - Zindović, Budo
AU  - Kapor, Radomir
AU  - Savić, Ljubodrag
PY  - 2022
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3035
T1  - Hydraulic jump free-surface detection using image processing - детекција слободне површине хидрауличког скока путем метода обраде слика [техничко решење]
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3035
ER  - 

@misc{
author = "Ljubičić, Robert and Vićanović, Ivana and Zindović, Budo and Kapor, Radomir and Savić, Ljubodrag",
year = "2022",
title = "Hydraulic jump free-surface detection using image processing - детекција слободне површине хидрауличког скока путем метода обраде слика [техничко решење]",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3035"
}

Ljubičić, R., Vićanović, I., Zindović, B., Kapor, R.,& Savić, L.. (2022). Hydraulic jump free-surface detection using image processing - детекција слободне површине хидрауличког скока путем метода обраде слика [техничко решење]. .
https://hdl.handle.net/21.15107/rcub_grafar_3035

Ljubičić R, Vićanović I, Zindović B, Kapor R, Savić L. Hydraulic jump free-surface detection using image processing - детекција слободне површине хидрауличког скока путем метода обраде слика [техничко решење]. 2022;.
https://hdl.handle.net/21.15107/rcub_grafar_3035 .

Ljubičić, Robert, Vićanović, Ivana, Zindović, Budo, Kapor, Radomir, Savić, Ljubodrag, "Hydraulic jump free-surface detection using image processing - детекција слободне површине хидрауличког скока путем метода обраде слика [техничко решење]" (2022),
https://hdl.handle.net/21.15107/rcub_grafar_3035 .

TY  - CONF
AU  - Ljubičić, Robert
AU  - Đorđević, Filip
AU  - Zindović, Budo
AU  - Kapor, Radomir
AU  - Savić, Ljubodrag
AU  - Glišić, Radmilo
AU  - Dmitrović, Ivana
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2613
AB  - U radu se prikazuju rezultati hidrauličkih modelskih ispitivanja glavnog evakuatora brane Sidi Naser. Na parcijalnom modelu proveren je kapacitet preliva za računski protok od 3708 m3/s. Na modelu je proverena efikasnost disipacije stepenastog brzotoka i visina razdelnih zidova. Takođe, ispitana je i efikasnost rada slapišta pri računskom protoku i osetljivost njegovog rada na promenu nivoa donje vode. Merenjm brzine strujanja niizvodno od slapišta pokazano je da regulisano korito nije ugroženo. Fizičkim modelom je potvrđeno da se projektovano rešenje dobro ponaša za opseg ispitanih protok
PB  - Srpsko društvo za hidraulička istraživanja i Srpsko društvo za hidrologiju
C3  - Zbornik radova 19. savetovanja SDHI/SDH
T1  - Hidrauličko modeliranje brane sa stepenastim brzotokom - primer brane Sidi Naceur
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2613
ER  - 

@conference{
author = "Ljubičić, Robert and Đorđević, Filip and Zindović, Budo and Kapor, Radomir and Savić, Ljubodrag and Glišić, Radmilo and Dmitrović, Ivana",
year = "2021",
abstract = "U radu se prikazuju rezultati hidrauličkih modelskih ispitivanja glavnog evakuatora brane Sidi Naser. Na parcijalnom modelu proveren je kapacitet preliva za računski protok od 3708 m3/s. Na modelu je proverena efikasnost disipacije stepenastog brzotoka i visina razdelnih zidova. Takođe, ispitana je i efikasnost rada slapišta pri računskom protoku i osetljivost njegovog rada na promenu nivoa donje vode. Merenjm brzine strujanja niizvodno od slapišta pokazano je da regulisano korito nije ugroženo. Fizičkim modelom je potvrđeno da se projektovano rešenje dobro ponaša za opseg ispitanih protok",
publisher = "Srpsko društvo za hidraulička istraživanja i Srpsko društvo za hidrologiju",
journal = "Zbornik radova 19. savetovanja SDHI/SDH",
title = "Hidrauličko modeliranje brane sa stepenastim brzotokom - primer brane Sidi Naceur",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2613"
}

Ljubičić, R., Đorđević, F., Zindović, B., Kapor, R., Savić, L., Glišić, R.,& Dmitrović, I.. (2021). Hidrauličko modeliranje brane sa stepenastim brzotokom - primer brane Sidi Naceur. in Zbornik radova 19. savetovanja SDHI/SDH
Srpsko društvo za hidraulička istraživanja i Srpsko društvo za hidrologiju..
https://hdl.handle.net/21.15107/rcub_grafar_2613

Ljubičić R, Đorđević F, Zindović B, Kapor R, Savić L, Glišić R, Dmitrović I. Hidrauličko modeliranje brane sa stepenastim brzotokom - primer brane Sidi Naceur. in Zbornik radova 19. savetovanja SDHI/SDH. 2021;.
https://hdl.handle.net/21.15107/rcub_grafar_2613 .

Ljubičić, Robert, Đorđević, Filip, Zindović, Budo, Kapor, Radomir, Savić, Ljubodrag, Glišić, Radmilo, Dmitrović, Ivana, "Hidrauličko modeliranje brane sa stepenastim brzotokom - primer brane Sidi Naceur" in Zbornik radova 19. savetovanja SDHI/SDH (2021),
https://hdl.handle.net/21.15107/rcub_grafar_2613 .

TY  - CONF
AU  - Đorđević, Filip
AU  - Ljubičić, Robert
AU  - Zindović, Budo
AU  - Kapor, Radomir
AU  - Savić, Ljubodrag
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2614
AB  - Stepenasti brzotoci su dobri disipatori energije, posebno pri nižim vrednostima jediničnog protoka. Sa povećanjem jediničnog protoka, efikasnost disipacije se smanjuje što rezultuje većom preostalom energijom na ulazu u umirujući bazen. Da bi se smanjile dimenzije bazena a povećala pouzdanost i efikasnost njihovog rada, često se projektuju sa blokovima. Uticaj dimenzija, rasporeda i položaja blokova za umirenje za potrebe ovog rada, ispitan je na fizičkom modelu. Rezultati su pokazali da se efikasnost disipacije može poboljšati povećanjem broja blokova (npr. dva reda umesto jednog) i da je povoljnije ukoliko su najuzvodniji blokovi manji. Rezultati ukazuju i da veći broj zuba može značajno da poboljša i stabilnost toka nizvodno od hidrauličkog skoka i smanjiti prskanje. U narednim fazama, ispitivanja obuhvatili bi se i umirujući bazeni sa nagnutim dnom.
PB  - Srpsko društvo za hidraulička istraživanja i Srpsko društvo za hidrologiju
C3  - Zbornik radova 19. savetovanja SDHI/SDH
T1  - Uticaj veličine, rasporeda i položaja blokova umirujućeg bazena stepenastog brzotoka na preostalu energiju
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2614
ER  - 

@conference{
author = "Đorđević, Filip and Ljubičić, Robert and Zindović, Budo and Kapor, Radomir and Savić, Ljubodrag",
year = "2021",
abstract = "Stepenasti brzotoci su dobri disipatori energije, posebno pri nižim vrednostima jediničnog protoka. Sa povećanjem jediničnog protoka, efikasnost disipacije se smanjuje što rezultuje većom preostalom energijom na ulazu u umirujući bazen. Da bi se smanjile dimenzije bazena a povećala pouzdanost i efikasnost njihovog rada, često se projektuju sa blokovima. Uticaj dimenzija, rasporeda i položaja blokova za umirenje za potrebe ovog rada, ispitan je na fizičkom modelu. Rezultati su pokazali da se efikasnost disipacije može poboljšati povećanjem broja blokova (npr. dva reda umesto jednog) i da je povoljnije ukoliko su najuzvodniji blokovi manji. Rezultati ukazuju i da veći broj zuba može značajno da poboljša i stabilnost toka nizvodno od hidrauličkog skoka i smanjiti prskanje. U narednim fazama, ispitivanja obuhvatili bi se i umirujući bazeni sa nagnutim dnom.",
publisher = "Srpsko društvo za hidraulička istraživanja i Srpsko društvo za hidrologiju",
journal = "Zbornik radova 19. savetovanja SDHI/SDH",
title = "Uticaj veličine, rasporeda i položaja blokova umirujućeg bazena stepenastog brzotoka na preostalu energiju",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2614"
}

Đorđević, F., Ljubičić, R., Zindović, B., Kapor, R.,& Savić, L.. (2021). Uticaj veličine, rasporeda i položaja blokova umirujućeg bazena stepenastog brzotoka na preostalu energiju. in Zbornik radova 19. savetovanja SDHI/SDH
Srpsko društvo za hidraulička istraživanja i Srpsko društvo za hidrologiju..
https://hdl.handle.net/21.15107/rcub_grafar_2614

Đorđević F, Ljubičić R, Zindović B, Kapor R, Savić L. Uticaj veličine, rasporeda i položaja blokova umirujućeg bazena stepenastog brzotoka na preostalu energiju. in Zbornik radova 19. savetovanja SDHI/SDH. 2021;.
https://hdl.handle.net/21.15107/rcub_grafar_2614 .

Đorđević, Filip, Ljubičić, Robert, Zindović, Budo, Kapor, Radomir, Savić, Ljubodrag, "Uticaj veličine, rasporeda i položaja blokova umirujućeg bazena stepenastog brzotoka na preostalu energiju" in Zbornik radova 19. savetovanja SDHI/SDH (2021),
https://hdl.handle.net/21.15107/rcub_grafar_2614 .

TY  - JOUR
AU  - Ljubičić, Robert
AU  - Strelnikova, Dariia
AU  - Perks, Matthew
AU  - Eltner, Anette
AU  - Peña-Haro, Salvador
AU  - Pizarro, Alonso
AU  - Dal Sasso, Silvano Fortunato
AU  - Scherling, Ulf
AU  - Vuono, Pietro
AU  - Manfreda, Salvatore
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2413
AB  - While the availability and affordability of unmanned aerial systems (UASs) has led to the rapid development of remote sensing applications in hydrology and hydrometry, uncertainties related to such measurements must be quantified and mitigated. The physical instability of the UAS platform inevitably induces motion in the acquired videos and can have a significant impact on the accuracy of camera-based measurements, such as velocimetry. A common practice in data preprocessing is compensation of platform-induced motion by means of digital image stabilisation (DIS) methods, which use the visual information from the captured videos – in the form of static features – to first estimate and then compensate for such motion. Most existing stabilisation approaches rely either on customised tools developed in-house, based on different algorithms, or on general purpose commercial software. Intercomparison of different stabilisation tools for UAS remote sensing purposes that could serve as a basis for selecting a particular tool in given conditions has not been found in the literature. In this paper, we have attempted to summarise and describe several freely available DIS tools applicable to UAS velocimetry. A total of seven tools – six aimed specifically at velocimetry and one general purpose software – were investigated in terms of their (1) stabilisation accuracy in various conditions, (2) robustness, (3) computational complexity, and (4) user experience, using three case study videos with different flight and ground conditions. In an attempt to adequately quantify the accuracy of the stabilisation using different tools, we have also presented a comparison metric based on root mean squared differences (RMSDs) of inter-frame pixel intensities for selected static features. The most apparent differences between the investigated tools have been found with regards to the method for identifying static features in videos, i.e. manual selection of features or automatic. State-of-the-art methods which rely on automatic selection of features require fewer user-provided parameters and are able to select a significantly higher number of potentially static features (by several orders of magnitude) when compared to the methods which require manual identification of such features. This allows the former to achieve a higher stabilisation accuracy, but manual feature selection methods have demonstrated lower computational complexity and better robustness in complex field conditions. While this paper does not intend to identify the optimal stabilisation tool for UAS-based velocimetry purposes, it does aim to shed light on details of implementation, which can help engineers and researchers choose the tool suitable for their needs and specific field conditions. Additionally, the RMSD comparison metric presented in this paper can be used in order to measure the velocity estimation uncertainty induced by UAS motion.
PB  - Copernicus, EGU
T2  - Hydrology and Earth System Sciences
T1  - A comparison of tools and techniques for stabilising unmanned aerial system (UAS) imagery for surface flow observations
VL  - 25
DO  - 10.5194/hess-25-5105-2021
ER  - 

@article{
author = "Ljubičić, Robert and Strelnikova, Dariia and Perks, Matthew and Eltner, Anette and Peña-Haro, Salvador and Pizarro, Alonso and Dal Sasso, Silvano Fortunato and Scherling, Ulf and Vuono, Pietro and Manfreda, Salvatore",
year = "2021",
abstract = "While the availability and affordability of unmanned aerial systems (UASs) has led to the rapid development of remote sensing applications in hydrology and hydrometry, uncertainties related to such measurements must be quantified and mitigated. The physical instability of the UAS platform inevitably induces motion in the acquired videos and can have a significant impact on the accuracy of camera-based measurements, such as velocimetry. A common practice in data preprocessing is compensation of platform-induced motion by means of digital image stabilisation (DIS) methods, which use the visual information from the captured videos – in the form of static features – to first estimate and then compensate for such motion. Most existing stabilisation approaches rely either on customised tools developed in-house, based on different algorithms, or on general purpose commercial software. Intercomparison of different stabilisation tools for UAS remote sensing purposes that could serve as a basis for selecting a particular tool in given conditions has not been found in the literature. In this paper, we have attempted to summarise and describe several freely available DIS tools applicable to UAS velocimetry. A total of seven tools – six aimed specifically at velocimetry and one general purpose software – were investigated in terms of their (1) stabilisation accuracy in various conditions, (2) robustness, (3) computational complexity, and (4) user experience, using three case study videos with different flight and ground conditions. In an attempt to adequately quantify the accuracy of the stabilisation using different tools, we have also presented a comparison metric based on root mean squared differences (RMSDs) of inter-frame pixel intensities for selected static features. The most apparent differences between the investigated tools have been found with regards to the method for identifying static features in videos, i.e. manual selection of features or automatic. State-of-the-art methods which rely on automatic selection of features require fewer user-provided parameters and are able to select a significantly higher number of potentially static features (by several orders of magnitude) when compared to the methods which require manual identification of such features. This allows the former to achieve a higher stabilisation accuracy, but manual feature selection methods have demonstrated lower computational complexity and better robustness in complex field conditions. While this paper does not intend to identify the optimal stabilisation tool for UAS-based velocimetry purposes, it does aim to shed light on details of implementation, which can help engineers and researchers choose the tool suitable for their needs and specific field conditions. Additionally, the RMSD comparison metric presented in this paper can be used in order to measure the velocity estimation uncertainty induced by UAS motion.",
publisher = "Copernicus, EGU",
journal = "Hydrology and Earth System Sciences",
title = "A comparison of tools and techniques for stabilising unmanned aerial system (UAS) imagery for surface flow observations",
volume = "25",
doi = "10.5194/hess-25-5105-2021"
}

Ljubičić, R., Strelnikova, D., Perks, M., Eltner, A., Peña-Haro, S., Pizarro, A., Dal Sasso, S. F., Scherling, U., Vuono, P.,& Manfreda, S.. (2021). A comparison of tools and techniques for stabilising unmanned aerial system (UAS) imagery for surface flow observations. in Hydrology and Earth System Sciences
Copernicus, EGU., 25.
https://doi.org/10.5194/hess-25-5105-2021

Ljubičić R, Strelnikova D, Perks M, Eltner A, Peña-Haro S, Pizarro A, Dal Sasso SF, Scherling U, Vuono P, Manfreda S. A comparison of tools and techniques for stabilising unmanned aerial system (UAS) imagery for surface flow observations. in Hydrology and Earth System Sciences. 2021;25.
doi:10.5194/hess-25-5105-2021 .

Ljubičić, Robert, Strelnikova, Dariia, Perks, Matthew, Eltner, Anette, Peña-Haro, Salvador, Pizarro, Alonso, Dal Sasso, Silvano Fortunato, Scherling, Ulf, Vuono, Pietro, Manfreda, Salvatore, "A comparison of tools and techniques for stabilising unmanned aerial system (UAS) imagery for surface flow observations" in Hydrology and Earth System Sciences, 25 (2021),
https://doi.org/10.5194/hess-25-5105-2021 . .

TY  - JOUR
AU  - Perks, Matthew T.
AU  - Dal Sasso, Silvano Fortunato
AU  - Hauet, Alexandre
AU  - Jamieson, Elizabeth
AU  - Le Coz, Jérôme
AU  - Pearce, Sophie
AU  - Peña-Haro, Salvador
AU  - Pizarro, Alonso
AU  - Strelnikova, Dariia
AU  - Tauro, Flavia
AU  - Bomhof, James
AU  - Grimaldi, Salvatore
AU  - Goulet, Alain
AU  - Hortobágyi, Borbála
AU  - Jodeau, Magali
AU  - Käfer, Sabine
AU  - Ljubičić, Robert
AU  - Maddock, Ian
AU  - Mayr, Peter
AU  - Paulus, Gernot
AU  - Pénard, Lionel
AU  - Sinclair, Leigh
AU  - Manfreda, Salvatore
PY  - 2020
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2012
AB  - Since the turn of the 21st century, image-based velocimetry techniques have become an increasingly popular approach for determining open-channel flow in a range of hydrological settings across Europe and beyond. Simultaneously, a range of large-scale image velocimetry algorithms have been developed that are equipped with differing image pre-processing and analytical capabilities. Yet in operational hydrometry, these techniques are utilised by few competent authorities. Therefore, imagery collected for image velocimetry analysis (along with reference data) is required both to enable inter-comparisons between these differing approaches and to test their overall efficacy. Through benchmarking exercises, it will be possible to assess which approaches are best suited for a range of fluvial settings, and to focus future software developments. Here we collate and describe datasets acquired from seven countries across Europe and North America, consisting of videos that have been subjected to a range of pre-processing and image velocimetry analyses (Perks et al., 2020, https://doi.org/10.4121/uuid:014d56f7-06dd-49ad-a48c-2282ab10428e). Reference data are available for 12 of the 13 case studies presented, enabling these data to be used for reference and accuracy assessment.
PB  - Copernicus Publications
T2  - Earth System Science Data
T1  - Towards harmonisation of image velocimetry techniques for river surface velocity observations
IS  - 3
VL  - 12
DO  - 10.5194/essd-12-1545-2020
ER  - 

@article{
author = "Perks, Matthew T. and Dal Sasso, Silvano Fortunato and Hauet, Alexandre and Jamieson, Elizabeth and Le Coz, Jérôme and Pearce, Sophie and Peña-Haro, Salvador and Pizarro, Alonso and Strelnikova, Dariia and Tauro, Flavia and Bomhof, James and Grimaldi, Salvatore and Goulet, Alain and Hortobágyi, Borbála and Jodeau, Magali and Käfer, Sabine and Ljubičić, Robert and Maddock, Ian and Mayr, Peter and Paulus, Gernot and Pénard, Lionel and Sinclair, Leigh and Manfreda, Salvatore",
year = "2020",
abstract = "Since the turn of the 21st century, image-based velocimetry techniques have become an increasingly popular approach for determining open-channel flow in a range of hydrological settings across Europe and beyond. Simultaneously, a range of large-scale image velocimetry algorithms have been developed that are equipped with differing image pre-processing and analytical capabilities. Yet in operational hydrometry, these techniques are utilised by few competent authorities. Therefore, imagery collected for image velocimetry analysis (along with reference data) is required both to enable inter-comparisons between these differing approaches and to test their overall efficacy. Through benchmarking exercises, it will be possible to assess which approaches are best suited for a range of fluvial settings, and to focus future software developments. Here we collate and describe datasets acquired from seven countries across Europe and North America, consisting of videos that have been subjected to a range of pre-processing and image velocimetry analyses (Perks et al., 2020, https://doi.org/10.4121/uuid:014d56f7-06dd-49ad-a48c-2282ab10428e). Reference data are available for 12 of the 13 case studies presented, enabling these data to be used for reference and accuracy assessment.",
publisher = "Copernicus Publications",
journal = "Earth System Science Data",
title = "Towards harmonisation of image velocimetry techniques for river surface velocity observations",
number = "3",
volume = "12",
doi = "10.5194/essd-12-1545-2020"
}

Perks, M. T., Dal Sasso, S. F., Hauet, A., Jamieson, E., Le Coz, J., Pearce, S., Peña-Haro, S., Pizarro, A., Strelnikova, D., Tauro, F., Bomhof, J., Grimaldi, S., Goulet, A., Hortobágyi, B., Jodeau, M., Käfer, S., Ljubičić, R., Maddock, I., Mayr, P., Paulus, G., Pénard, L., Sinclair, L.,& Manfreda, S.. (2020). Towards harmonisation of image velocimetry techniques for river surface velocity observations. in Earth System Science Data
Copernicus Publications., 12(3).
https://doi.org/10.5194/essd-12-1545-2020

Perks MT, Dal Sasso SF, Hauet A, Jamieson E, Le Coz J, Pearce S, Peña-Haro S, Pizarro A, Strelnikova D, Tauro F, Bomhof J, Grimaldi S, Goulet A, Hortobágyi B, Jodeau M, Käfer S, Ljubičić R, Maddock I, Mayr P, Paulus G, Pénard L, Sinclair L, Manfreda S. Towards harmonisation of image velocimetry techniques for river surface velocity observations. in Earth System Science Data. 2020;12(3).
doi:10.5194/essd-12-1545-2020 .

Perks, Matthew T., Dal Sasso, Silvano Fortunato, Hauet, Alexandre, Jamieson, Elizabeth, Le Coz, Jérôme, Pearce, Sophie, Peña-Haro, Salvador, Pizarro, Alonso, Strelnikova, Dariia, Tauro, Flavia, Bomhof, James, Grimaldi, Salvatore, Goulet, Alain, Hortobágyi, Borbála, Jodeau, Magali, Käfer, Sabine, Ljubičić, Robert, Maddock, Ian, Mayr, Peter, Paulus, Gernot, Pénard, Lionel, Sinclair, Leigh, Manfreda, Salvatore, "Towards harmonisation of image velocimetry techniques for river surface velocity observations" in Earth System Science Data, 12, no. 3 (2020),
https://doi.org/10.5194/essd-12-1545-2020 . .

TY  - JOUR
AU  - Pearce, Sophie
AU  - Ljubičić, Robert
AU  - Peña-Haro, Salvador
AU  - Perks, Matthew
AU  - Tauro, Flavia
AU  - Pizarro, Alonso
AU  - Dal Sasso, Silvano
AU  - Strelnikova, Dariia
AU  - Grimaldi, Salvatore
AU  - Maddock, Ian
AU  - Paulus, Gernot
AU  - Plavšić, Jasna
AU  - Prodanović, Dušan
AU  - Manfreda, Salvatore
PY  - 2020
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1869
AB  - Image velocimetry has proven to be a promising technique for monitoring river flows using remotely operated platforms such as Unmanned Aerial Systems (UAS). However, the application of various image velocimetry algorithms has not been extensively assessed. Therefore, a sensitivity analysis has been conducted on five different image velocimetry algorithms including Large Scale Particle Image Velocimetry (LSPIV), Large-Scale Particle Tracking Velocimetry (LSPTV), Kanade–Lucas Tomasi Image Velocimetry (KLT-IV or KLT), Optical Tracking Velocimetry (OTV) and Surface Structure Image Velocimetry (SSIV), during low river flow conditions (average surface velocities of 0.12–0.14 m s−1, Q60) on the River Kolubara, Central Serbia. A DJI Phantom 4 Pro UAS was used to collect two 30-second videos of the surface flow. Artificial seeding material was distributed homogeneously across the rivers surface, to enhance the conditions for image velocimetry techniques. The sensitivity analysis was performed on comparable parameters between the different algorithms, including the particle identification area parameters (such as Interrogation Area (LSPIV, LSPTV and SSIV), Block Size (KLT-IV) and Trajectory Length (OTV)) and the feature extraction rate. Results highlighted that KLT and SSIV were sensitive to changing the feature extraction rate; however, changing the particle identification area did not affect the surface velocity results significantly. OTV and LSPTV, on the other hand, highlighted that changing the particle identification area presented higher variability in the results, while changing the feature extraction rate did not affect the surface velocity outputs. LSPIV proved to be sensitive to changing both the feature extraction rate and the particle identification area. This analysis has led to the conclusions that for surface velocities of approximately 0.12 m s−1 image velocimetry techniques can provide results comparable to traditional techniques such as ADCPs. However, LSPIV, LSPTV and OTV require additional effort for calibration and selecting the appropriate parameters when compared to KLT-IV and SSIV. Despite the varying levels of sensitivity of each algorithm to changing parameters, all configuration image velocimetry algorithms provided results that were within 0.05 m s−1 of the ADCP measurements, on average.
PB  - MDPI
T2  - Remote Sensing
T1  - An Evaluation of Image Velocimetry Techniques under Low Flow Conditions and High Seeding Densities Using Unmanned Aerial Systems
IS  - 2
VL  - 12
DO  - 10.3390/rs12020232
ER  - 

@article{
author = "Pearce, Sophie and Ljubičić, Robert and Peña-Haro, Salvador and Perks, Matthew and Tauro, Flavia and Pizarro, Alonso and Dal Sasso, Silvano and Strelnikova, Dariia and Grimaldi, Salvatore and Maddock, Ian and Paulus, Gernot and Plavšić, Jasna and Prodanović, Dušan and Manfreda, Salvatore",
year = "2020",
abstract = "Image velocimetry has proven to be a promising technique for monitoring river flows using remotely operated platforms such as Unmanned Aerial Systems (UAS). However, the application of various image velocimetry algorithms has not been extensively assessed. Therefore, a sensitivity analysis has been conducted on five different image velocimetry algorithms including Large Scale Particle Image Velocimetry (LSPIV), Large-Scale Particle Tracking Velocimetry (LSPTV), Kanade–Lucas Tomasi Image Velocimetry (KLT-IV or KLT), Optical Tracking Velocimetry (OTV) and Surface Structure Image Velocimetry (SSIV), during low river flow conditions (average surface velocities of 0.12–0.14 m s−1, Q60) on the River Kolubara, Central Serbia. A DJI Phantom 4 Pro UAS was used to collect two 30-second videos of the surface flow. Artificial seeding material was distributed homogeneously across the rivers surface, to enhance the conditions for image velocimetry techniques. The sensitivity analysis was performed on comparable parameters between the different algorithms, including the particle identification area parameters (such as Interrogation Area (LSPIV, LSPTV and SSIV), Block Size (KLT-IV) and Trajectory Length (OTV)) and the feature extraction rate. Results highlighted that KLT and SSIV were sensitive to changing the feature extraction rate; however, changing the particle identification area did not affect the surface velocity results significantly. OTV and LSPTV, on the other hand, highlighted that changing the particle identification area presented higher variability in the results, while changing the feature extraction rate did not affect the surface velocity outputs. LSPIV proved to be sensitive to changing both the feature extraction rate and the particle identification area. This analysis has led to the conclusions that for surface velocities of approximately 0.12 m s−1 image velocimetry techniques can provide results comparable to traditional techniques such as ADCPs. However, LSPIV, LSPTV and OTV require additional effort for calibration and selecting the appropriate parameters when compared to KLT-IV and SSIV. Despite the varying levels of sensitivity of each algorithm to changing parameters, all configuration image velocimetry algorithms provided results that were within 0.05 m s−1 of the ADCP measurements, on average.",
publisher = "MDPI",
journal = "Remote Sensing",
title = "An Evaluation of Image Velocimetry Techniques under Low Flow Conditions and High Seeding Densities Using Unmanned Aerial Systems",
number = "2",
volume = "12",
doi = "10.3390/rs12020232"
}

Pearce, S., Ljubičić, R., Peña-Haro, S., Perks, M., Tauro, F., Pizarro, A., Dal Sasso, S., Strelnikova, D., Grimaldi, S., Maddock, I., Paulus, G., Plavšić, J., Prodanović, D.,& Manfreda, S.. (2020). An Evaluation of Image Velocimetry Techniques under Low Flow Conditions and High Seeding Densities Using Unmanned Aerial Systems. in Remote Sensing
MDPI., 12(2).
https://doi.org/10.3390/rs12020232

Pearce S, Ljubičić R, Peña-Haro S, Perks M, Tauro F, Pizarro A, Dal Sasso S, Strelnikova D, Grimaldi S, Maddock I, Paulus G, Plavšić J, Prodanović D, Manfreda S. An Evaluation of Image Velocimetry Techniques under Low Flow Conditions and High Seeding Densities Using Unmanned Aerial Systems. in Remote Sensing. 2020;12(2).
doi:10.3390/rs12020232 .

Pearce, Sophie, Ljubičić, Robert, Peña-Haro, Salvador, Perks, Matthew, Tauro, Flavia, Pizarro, Alonso, Dal Sasso, Silvano, Strelnikova, Dariia, Grimaldi, Salvatore, Maddock, Ian, Paulus, Gernot, Plavšić, Jasna, Prodanović, Dušan, Manfreda, Salvatore, "An Evaluation of Image Velocimetry Techniques under Low Flow Conditions and High Seeding Densities Using Unmanned Aerial Systems" in Remote Sensing, 12, no. 2 (2020),
https://doi.org/10.3390/rs12020232 . .

TY  - JOUR
AU  - Ljubičić, Robert
AU  - Vićanović, Ivana
AU  - Zindović, Budo
AU  - Kapor, Radomir
AU  - Savić, Ljubodrag
PY  - 2020
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1976
AB  - High-frequency oscillations and high surface aeration, induced by the strong turbulence, make water depth measurement for hydraulic jumps a persistently challenging task. The investigation of the hydraulic jump behaviour persists as an important research theme, especially with regards to the stilling basin design. Reliable knowledge of time-averaged and extreme values along a depth profile can help develop an adequate design of a stilling basin, improve safety and aid the understanding of the jump phenomenon. This paper presents an attempt of mitigating certain limitations of existing depth measurement methods by adopting a non-intrusive computer vision-based approach to measuring water depth profile of a hydraulic jump. The proposed method analyses video data in order to detect the boundary between the air-water mixture and the laboratory flume wall. This is achieved by coupling two computer vision methods: (1) analysis of the vertical image gradients, and (2) general-purpose edge detection using a deep neural network model. While the gradient analysis technique alone can provide adequate results, its performance can be significantly improved in combination with a neural network model which incorporates a "human-like" vision in the algorithm. The model coupling reduces the likelihood of false detections and improves the overall detection accuracy. The proposed method is tested in two experiments with different degrees of jump aeration. Results show that the coupled model can reliably and accurately capture the instantaneous depth profile along the jump, with low sensitivity to image noise and flow aeration. The coupled model presented fewer false detections than the gradient-based model, and offered consistent performance in regions of high, as well as low aeration. The proposed approach allows for automated detection of the free-surface interface and expands the potential of computer vision-based measurement methods in hydraulics.
PB  - IOP
T2  - Measurement Science and Technology
T1  - Image processing for hydraulic jump free-surface detection: coupled gradient/machine learning model
DO  - 10.1088/1361-6501/ab8b22
ER  - 

@article{
author = "Ljubičić, Robert and Vićanović, Ivana and Zindović, Budo and Kapor, Radomir and Savić, Ljubodrag",
year = "2020",
abstract = "High-frequency oscillations and high surface aeration, induced by the strong turbulence, make water depth measurement for hydraulic jumps a persistently challenging task. The investigation of the hydraulic jump behaviour persists as an important research theme, especially with regards to the stilling basin design. Reliable knowledge of time-averaged and extreme values along a depth profile can help develop an adequate design of a stilling basin, improve safety and aid the understanding of the jump phenomenon. This paper presents an attempt of mitigating certain limitations of existing depth measurement methods by adopting a non-intrusive computer vision-based approach to measuring water depth profile of a hydraulic jump. The proposed method analyses video data in order to detect the boundary between the air-water mixture and the laboratory flume wall. This is achieved by coupling two computer vision methods: (1) analysis of the vertical image gradients, and (2) general-purpose edge detection using a deep neural network model. While the gradient analysis technique alone can provide adequate results, its performance can be significantly improved in combination with a neural network model which incorporates a "human-like" vision in the algorithm. The model coupling reduces the likelihood of false detections and improves the overall detection accuracy. The proposed method is tested in two experiments with different degrees of jump aeration. Results show that the coupled model can reliably and accurately capture the instantaneous depth profile along the jump, with low sensitivity to image noise and flow aeration. The coupled model presented fewer false detections than the gradient-based model, and offered consistent performance in regions of high, as well as low aeration. The proposed approach allows for automated detection of the free-surface interface and expands the potential of computer vision-based measurement methods in hydraulics.",
publisher = "IOP",
journal = "Measurement Science and Technology",
title = "Image processing for hydraulic jump free-surface detection: coupled gradient/machine learning model",
doi = "10.1088/1361-6501/ab8b22"
}

Ljubičić, R., Vićanović, I., Zindović, B., Kapor, R.,& Savić, L.. (2020). Image processing for hydraulic jump free-surface detection: coupled gradient/machine learning model. in Measurement Science and Technology
IOP..
https://doi.org/10.1088/1361-6501/ab8b22

Ljubičić R, Vićanović I, Zindović B, Kapor R, Savić L. Image processing for hydraulic jump free-surface detection: coupled gradient/machine learning model. in Measurement Science and Technology. 2020;.
doi:10.1088/1361-6501/ab8b22 .

Ljubičić, Robert, Vićanović, Ivana, Zindović, Budo, Kapor, Radomir, Savić, Ljubodrag, "Image processing for hydraulic jump free-surface detection: coupled gradient/machine learning model" in Measurement Science and Technology (2020),
https://doi.org/10.1088/1361-6501/ab8b22 . .

TY  - JOUR
AU  - Marjanović, Dušan
AU  - Vićanović, Ivana
AU  - Ljubičić, Robert
AU  - Zindović, Budo
AU  - Savić, Ljubodrag
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1867
AB  - Određivanje i praćenje promena nivoa vode u laboratorijskim uslovima primenom tradicionalnih mernih metoda opterećeno je raznim nedostacima: tačnost, frekvencija uzorkovanja, inertnost mernog uređaja i osetljivost na spoljne faktore. U cilju prevazilaženja navedenih nedostataka predlaže se alternativna metoda, zasnovana na tehnikama obrade slika iz video zapisa laboratorijskog eksperimenta. Pored opisa metodologije i njene primene na model vodostana pri brzim oscilacijama nivoa, ovaj rad prikazuje i poređenje dobijenih rezultata merenja sa dve tradicionalne metode: (1) ultražvučno merenje udaljenosti, i (2) merenje pritiska u tački. Pokazano je da je predložena metoda uporedive tačnosti, da ima niži nivo šuma i da je manje osetljiva na uticaj spoljnih faktora. Zbog svega navedenog, prikazana metoda može se koristiti kao adekvatna alternativa klasičnim mernim tehnikama u laboratorijskim uslovima.
PB  - Srpsko društo za odvodnjavanje i navodnjavanje
T2  - Vodoprivreda
T1  - Detekcija nivoa u laboratorijskim kanalima primenom tehnike obrade slika
IS  - 300-302
VL  - 51
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1867
ER  - 

@article{
author = "Marjanović, Dušan and Vićanović, Ivana and Ljubičić, Robert and Zindović, Budo and Savić, Ljubodrag",
year = "2019",
abstract = "Određivanje i praćenje promena nivoa vode u laboratorijskim uslovima primenom tradicionalnih mernih metoda opterećeno je raznim nedostacima: tačnost, frekvencija uzorkovanja, inertnost mernog uređaja i osetljivost na spoljne faktore. U cilju prevazilaženja navedenih nedostataka predlaže se alternativna metoda, zasnovana na tehnikama obrade slika iz video zapisa laboratorijskog eksperimenta. Pored opisa metodologije i njene primene na model vodostana pri brzim oscilacijama nivoa, ovaj rad prikazuje i poređenje dobijenih rezultata merenja sa dve tradicionalne metode: (1) ultražvučno merenje udaljenosti, i (2) merenje pritiska u tački. Pokazano je da je predložena metoda uporedive tačnosti, da ima niži nivo šuma i da je manje osetljiva na uticaj spoljnih faktora. Zbog svega navedenog, prikazana metoda može se koristiti kao adekvatna alternativa klasičnim mernim tehnikama u laboratorijskim uslovima.",
publisher = "Srpsko društo za odvodnjavanje i navodnjavanje",
journal = "Vodoprivreda",
title = "Detekcija nivoa u laboratorijskim kanalima primenom tehnike obrade slika",
number = "300-302",
volume = "51",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1867"
}

Marjanović, D., Vićanović, I., Ljubičić, R., Zindović, B.,& Savić, L.. (2019). Detekcija nivoa u laboratorijskim kanalima primenom tehnike obrade slika. in Vodoprivreda
Srpsko društo za odvodnjavanje i navodnjavanje., 51(300-302).
https://hdl.handle.net/21.15107/rcub_grafar_1867

Marjanović D, Vićanović I, Ljubičić R, Zindović B, Savić L. Detekcija nivoa u laboratorijskim kanalima primenom tehnike obrade slika. in Vodoprivreda. 2019;51(300-302).
https://hdl.handle.net/21.15107/rcub_grafar_1867 .

Marjanović, Dušan, Vićanović, Ivana, Ljubičić, Robert, Zindović, Budo, Savić, Ljubodrag, "Detekcija nivoa u laboratorijskim kanalima primenom tehnike obrade slika" in Vodoprivreda, 51, no. 300-302 (2019),
https://hdl.handle.net/21.15107/rcub_grafar_1867 .

TY  - CONF
AU  - Ljubičić, Robert
AU  - Vićanović, Ivana
AU  - Zindović, Budo
AU  - Kapor, Radomir
AU  - Savić, Ljubodrag
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1868
AB  - Hydraulic jumps exhibit a high degree of free-surface oscillations, triggered by intense turbulence and aeration.
These processes are difficult to model numerically and are frequently investigated on a scale model. However,
measuring the oscillatory characteristics of the hydraulic jump is not without issues, as the majority of available
methods are not intended for tracking instantaneous depth profile or free-surface interface (FSI). Some methods
are limited to a selected set of few predetermined points, and are sensitive to variations of secondary
characteristics of the hydraulic jump: point gauges are sensitive to aeration rate and rate of the free-surface
changes, electroconductive and optical probes require direct contact with the air-water mixture (disrupting the
free surface), while the ultrasonic distance measurement accuracy is severely impacted by the shape of the
free surface and aeration rate. To alleviate these issues, we propose the application of the non-intrusive method
based on image processing techniques to detect the instantaneous FSI. The first step is to record the freesurface region in a series of images, with a predefined constant time shift. Subsequently, the FSI along the
hydraulic jump is detected in every image. Presented method was used to reconstruct temporal evolution of the
depth profile from the FSI position in the recorded images. The obtained dominant FSI oscillation frequencies
along the hydraulic jump show good agreement with previous research. Results also show that the proposed
approach is more robust than previously available methods – minor sensitivity to camera shooting angle, rate
of the free-surface change, surface aeration variability, etc. Method is also very simple, with only a few tunable
parameters, and affordable, as the only required equipment is a camera. The preprocessing and calibration
steps needed to obtain reliable data for further processing are also described. Using method presented in this
paper, one can gain a better understanding of the characteristics of the hydraulic jump: instantaneous and timeaveraged FSI profile, as well as the frequency spectrum of FSI variations along the hydraulic jump. This can be
useful for the design of hydraulic structures, in particular – the hydraulic jump stilling basins.
PB  - IAHR
C3  - E-proceedings of the 38th IAHR World Congress
T1  - Image Processing for Hydraulic Jump Free-Surface Detection
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1868
ER  - 

@conference{
author = "Ljubičić, Robert and Vićanović, Ivana and Zindović, Budo and Kapor, Radomir and Savić, Ljubodrag",
year = "2019",
abstract = "Hydraulic jumps exhibit a high degree of free-surface oscillations, triggered by intense turbulence and aeration.
These processes are difficult to model numerically and are frequently investigated on a scale model. However,
measuring the oscillatory characteristics of the hydraulic jump is not without issues, as the majority of available
methods are not intended for tracking instantaneous depth profile or free-surface interface (FSI). Some methods
are limited to a selected set of few predetermined points, and are sensitive to variations of secondary
characteristics of the hydraulic jump: point gauges are sensitive to aeration rate and rate of the free-surface
changes, electroconductive and optical probes require direct contact with the air-water mixture (disrupting the
free surface), while the ultrasonic distance measurement accuracy is severely impacted by the shape of the
free surface and aeration rate. To alleviate these issues, we propose the application of the non-intrusive method
based on image processing techniques to detect the instantaneous FSI. The first step is to record the freesurface region in a series of images, with a predefined constant time shift. Subsequently, the FSI along the
hydraulic jump is detected in every image. Presented method was used to reconstruct temporal evolution of the
depth profile from the FSI position in the recorded images. The obtained dominant FSI oscillation frequencies
along the hydraulic jump show good agreement with previous research. Results also show that the proposed
approach is more robust than previously available methods – minor sensitivity to camera shooting angle, rate
of the free-surface change, surface aeration variability, etc. Method is also very simple, with only a few tunable
parameters, and affordable, as the only required equipment is a camera. The preprocessing and calibration
steps needed to obtain reliable data for further processing are also described. Using method presented in this
paper, one can gain a better understanding of the characteristics of the hydraulic jump: instantaneous and timeaveraged FSI profile, as well as the frequency spectrum of FSI variations along the hydraulic jump. This can be
useful for the design of hydraulic structures, in particular – the hydraulic jump stilling basins.",
publisher = "IAHR",
journal = "E-proceedings of the 38th IAHR World Congress",
title = "Image Processing for Hydraulic Jump Free-Surface Detection",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1868"
}

Ljubičić, R., Vićanović, I., Zindović, B., Kapor, R.,& Savić, L.. (2019). Image Processing for Hydraulic Jump Free-Surface Detection. in E-proceedings of the 38th IAHR World Congress
IAHR..
https://hdl.handle.net/21.15107/rcub_grafar_1868

Ljubičić R, Vićanović I, Zindović B, Kapor R, Savić L. Image Processing for Hydraulic Jump Free-Surface Detection. in E-proceedings of the 38th IAHR World Congress. 2019;.
https://hdl.handle.net/21.15107/rcub_grafar_1868 .

Ljubičić, Robert, Vićanović, Ivana, Zindović, Budo, Kapor, Radomir, Savić, Ljubodrag, "Image Processing for Hydraulic Jump Free-Surface Detection" in E-proceedings of the 38th IAHR World Congress (2019),
https://hdl.handle.net/21.15107/rcub_grafar_1868 .

TY  - JOUR
AU  - Ljubičić, Robert
AU  - Zindović, Budo
AU  - Vojt, Predrag
AU  - Pavlović, Dragutin
AU  - Kapor, Radomir
AU  - Savić, Ljubodrag
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/940
AB  - The performance of flat stilling basins can be inadequate for conditions when the tailwater depth is insufficient for hydraulic jump stabilization. In such cases, adverse-slope stilling basins can be used because they reduce the necessary tailwater depth. Sloped basins combined with smooth chutes have been the subject of many studies. However, limited research has been done for basins with stepped chutes, which are characterized by intensive flow aeration and high energy dissipation. Based on our scale-model experimental measurements of depth, velocity, and air concentration, we present a momentum-based method to characterize such hydraulic jump: the sequent depth ratio, the length of hydraulic jump roller, and energy dissipation effectiveness. The proposed method provides better agreement with experimental data when compared to existing methods and can be used for preliminary design.
PB  - MDPI AG
T2  - Water
T1  - Hydraulic Jumps in Adverse-Slope Stilling Basins for Stepped Spillways
IS  - 4
VL  - 10
DO  - 10.3390/w10040460
ER  - 

@article{
author = "Ljubičić, Robert and Zindović, Budo and Vojt, Predrag and Pavlović, Dragutin and Kapor, Radomir and Savić, Ljubodrag",
year = "2018",
abstract = "The performance of flat stilling basins can be inadequate for conditions when the tailwater depth is insufficient for hydraulic jump stabilization. In such cases, adverse-slope stilling basins can be used because they reduce the necessary tailwater depth. Sloped basins combined with smooth chutes have been the subject of many studies. However, limited research has been done for basins with stepped chutes, which are characterized by intensive flow aeration and high energy dissipation. Based on our scale-model experimental measurements of depth, velocity, and air concentration, we present a momentum-based method to characterize such hydraulic jump: the sequent depth ratio, the length of hydraulic jump roller, and energy dissipation effectiveness. The proposed method provides better agreement with experimental data when compared to existing methods and can be used for preliminary design.",
publisher = "MDPI AG",
journal = "Water",
title = "Hydraulic Jumps in Adverse-Slope Stilling Basins for Stepped Spillways",
number = "4",
volume = "10",
doi = "10.3390/w10040460"
}

Ljubičić, R., Zindović, B., Vojt, P., Pavlović, D., Kapor, R.,& Savić, L.. (2018). Hydraulic Jumps in Adverse-Slope Stilling Basins for Stepped Spillways. in Water
MDPI AG., 10(4).
https://doi.org/10.3390/w10040460

Ljubičić R, Zindović B, Vojt P, Pavlović D, Kapor R, Savić L. Hydraulic Jumps in Adverse-Slope Stilling Basins for Stepped Spillways. in Water. 2018;10(4).
doi:10.3390/w10040460 .

Ljubičić, Robert, Zindović, Budo, Vojt, Predrag, Pavlović, Dragutin, Kapor, Radomir, Savić, Ljubodrag, "Hydraulic Jumps in Adverse-Slope Stilling Basins for Stepped Spillways" in Water, 10, no. 4 (2018),
https://doi.org/10.3390/w10040460 . .

TY  - CONF
AU  - Milovanović, Marija
AU  - Todorović, Andrijana
AU  - Ljubičić, Robert
AU  - Plavšić, Jasna
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1866
AB  - Cilj ovog rada je da se proveri da li brana Moharač i njen bočni preliv imaju kapacitet da prime poplavni talas koji je dobijen obradom ažuriranih podataka o računskim kišama i slivu. Treba imati u vidu da je došlo do povećanja merodavnih padavina, i samim tim do povećanja ulaznih protoka u akumulaciju. U radu je prikazana metodologija dobijanja ulaznih podataka za proračun transformacije poplavnog talasa, kao i rad programa HEC-HMS koji je korišćen za proračun. Na kraju, prikazani su rezultati dobijeni korišćenjem ovog softverskog paketa i formi računskih hidrograma. Maksimum ulaznog hidrograma dobijen je za kiše trajanja 1 h, dok je maksimum zapremine, nivoa vode u akumulaciji i izlaznog hidrograma dobijen za kiše trajanja 2 h. Zaključeno je da bočni preliv, sabirni kanal i prelazna deonica imaju kapacitet da propuste merodavne velike vode, pod uslovom da se formira normalna dubina na izlasku iz prelazne deonice. Preporuka je da se ovi rezultati provere detaljnijim hidrauličkim proračunima
PB  - SDHI/SDH
C3  - Zbornik radova 18. savetovanja SDHI/SDH
T1  - Analiza ublažavanja poplavnih talasa u akumulaciji Moharač
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1866
ER  - 

@conference{
author = "Milovanović, Marija and Todorović, Andrijana and Ljubičić, Robert and Plavšić, Jasna",
year = "2018",
abstract = "Cilj ovog rada je da se proveri da li brana Moharač i njen bočni preliv imaju kapacitet da prime poplavni talas koji je dobijen obradom ažuriranih podataka o računskim kišama i slivu. Treba imati u vidu da je došlo do povećanja merodavnih padavina, i samim tim do povećanja ulaznih protoka u akumulaciju. U radu je prikazana metodologija dobijanja ulaznih podataka za proračun transformacije poplavnog talasa, kao i rad programa HEC-HMS koji je korišćen za proračun. Na kraju, prikazani su rezultati dobijeni korišćenjem ovog softverskog paketa i formi računskih hidrograma. Maksimum ulaznog hidrograma dobijen je za kiše trajanja 1 h, dok je maksimum zapremine, nivoa vode u akumulaciji i izlaznog hidrograma dobijen za kiše trajanja 2 h. Zaključeno je da bočni preliv, sabirni kanal i prelazna deonica imaju kapacitet da propuste merodavne velike vode, pod uslovom da se formira normalna dubina na izlasku iz prelazne deonice. Preporuka je da se ovi rezultati provere detaljnijim hidrauličkim proračunima",
publisher = "SDHI/SDH",
journal = "Zbornik radova 18. savetovanja SDHI/SDH",
title = "Analiza ublažavanja poplavnih talasa u akumulaciji Moharač",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1866"
}

Milovanović, M., Todorović, A., Ljubičić, R.,& Plavšić, J.. (2018). Analiza ublažavanja poplavnih talasa u akumulaciji Moharač. in Zbornik radova 18. savetovanja SDHI/SDH
SDHI/SDH..
https://hdl.handle.net/21.15107/rcub_grafar_1866

Milovanović M, Todorović A, Ljubičić R, Plavšić J. Analiza ublažavanja poplavnih talasa u akumulaciji Moharač. in Zbornik radova 18. savetovanja SDHI/SDH. 2018;.
https://hdl.handle.net/21.15107/rcub_grafar_1866 .

Milovanović, Marija, Todorović, Andrijana, Ljubičić, Robert, Plavšić, Jasna, "Analiza ublažavanja poplavnih talasa u akumulaciji Moharač" in Zbornik radova 18. savetovanja SDHI/SDH (2018),
https://hdl.handle.net/21.15107/rcub_grafar_1866 .

TY  - CONF
AU  - Ljubičić, Robert
AU  - Zindović, Budo
AU  - Savić, Ljubodrag
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1865
AB  - Stilling basins are the most commonly used energy dissipating structure for large dams, due to their high operating reliability under a wide range of inflow conditions. However, unsatisfactory tailwater conditions, primarily low tailwater level, can necessitate the use of additional structural solutions for the stabilization of the occurring hydraulic jump. A possible solution to this issue is the use of the adverse-sloped basins, which use the weight of the water in the jump for jump stabilization. Adverse-slope basin design had attracted the interest of engineers and researchers in the last decade as a simple method for the reduction of the required tailwater depth and basin length. To this date, a number of analytical and empirical methods for the estimation of features of such jumps are developed. However, the applicability of these methods is hindered by their diverse accuracy and/or complexity. Based on the experimental measurements on a stepped spillway model, a multilayer perceptron model (MLP) was trained for the estimation of jump characteristics. An accuracy and sensitivity analyses were also performed for each used method. It was demonstrated that machine learning techniques can potentially provide significantly better results than certain analytical and empirical methods. This allows a simpler, faster, yet accurate analysis of the occurring hydraulic conditions in the early stages of design.
PB  - SDHI/SDH
C3  - Zbornik radova 18. savetovanja SDHI/SDH
T1  - Adverse-slope stilling basins: machine learning approach to estimation of hydraulic jump features
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1865
ER  - 

@conference{
author = "Ljubičić, Robert and Zindović, Budo and Savić, Ljubodrag",
year = "2018",
abstract = "Stilling basins are the most commonly used energy dissipating structure for large dams, due to their high operating reliability under a wide range of inflow conditions. However, unsatisfactory tailwater conditions, primarily low tailwater level, can necessitate the use of additional structural solutions for the stabilization of the occurring hydraulic jump. A possible solution to this issue is the use of the adverse-sloped basins, which use the weight of the water in the jump for jump stabilization. Adverse-slope basin design had attracted the interest of engineers and researchers in the last decade as a simple method for the reduction of the required tailwater depth and basin length. To this date, a number of analytical and empirical methods for the estimation of features of such jumps are developed. However, the applicability of these methods is hindered by their diverse accuracy and/or complexity. Based on the experimental measurements on a stepped spillway model, a multilayer perceptron model (MLP) was trained for the estimation of jump characteristics. An accuracy and sensitivity analyses were also performed for each used method. It was demonstrated that machine learning techniques can potentially provide significantly better results than certain analytical and empirical methods. This allows a simpler, faster, yet accurate analysis of the occurring hydraulic conditions in the early stages of design.",
publisher = "SDHI/SDH",
journal = "Zbornik radova 18. savetovanja SDHI/SDH",
title = "Adverse-slope stilling basins: machine learning approach to estimation of hydraulic jump features",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1865"
}

Ljubičić, R., Zindović, B.,& Savić, L.. (2018). Adverse-slope stilling basins: machine learning approach to estimation of hydraulic jump features. in Zbornik radova 18. savetovanja SDHI/SDH
SDHI/SDH..
https://hdl.handle.net/21.15107/rcub_grafar_1865

Ljubičić R, Zindović B, Savić L. Adverse-slope stilling basins: machine learning approach to estimation of hydraulic jump features. in Zbornik radova 18. savetovanja SDHI/SDH. 2018;.
https://hdl.handle.net/21.15107/rcub_grafar_1865 .

Ljubičić, Robert, Zindović, Budo, Savić, Ljubodrag, "Adverse-slope stilling basins: machine learning approach to estimation of hydraulic jump features" in Zbornik radova 18. savetovanja SDHI/SDH (2018),
https://hdl.handle.net/21.15107/rcub_grafar_1865 .

TY  - CONF
AU  - Ljubičić, Robert
AU  - Zindović, Budo
AU  - Stanić, Miloš
AU  - Savić, Ljubodrag
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1564
PB  - Budapest University of Technology and Economics, Department of Applied Biotechnology and Food Science, Budapest
C3  - Uniting Europe for clean water: cross-border cooperation of old, new and candidate countries of EU for identifying problems, finding causes and solutions : book of abstracts
T1  - Spillway Design Optimization for Embankment Dams Using Genetic Algorithms
EP  - 145
SP  - 138
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1564
ER  - 

@conference{
author = "Ljubičić, Robert and Zindović, Budo and Stanić, Miloš and Savić, Ljubodrag",
year = "2017",
publisher = "Budapest University of Technology and Economics, Department of Applied Biotechnology and Food Science, Budapest",
journal = "Uniting Europe for clean water: cross-border cooperation of old, new and candidate countries of EU for identifying problems, finding causes and solutions : book of abstracts",
title = "Spillway Design Optimization for Embankment Dams Using Genetic Algorithms",
pages = "145-138",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1564"
}

Ljubičić, R., Zindović, B., Stanić, M.,& Savić, L.. (2017). Spillway Design Optimization for Embankment Dams Using Genetic Algorithms. in Uniting Europe for clean water: cross-border cooperation of old, new and candidate countries of EU for identifying problems, finding causes and solutions : book of abstracts
Budapest University of Technology and Economics, Department of Applied Biotechnology and Food Science, Budapest., 138-145.
https://hdl.handle.net/21.15107/rcub_grafar_1564

Ljubičić R, Zindović B, Stanić M, Savić L. Spillway Design Optimization for Embankment Dams Using Genetic Algorithms. in Uniting Europe for clean water: cross-border cooperation of old, new and candidate countries of EU for identifying problems, finding causes and solutions : book of abstracts. 2017;:138-145.
https://hdl.handle.net/21.15107/rcub_grafar_1564 .

Ljubičić, Robert, Zindović, Budo, Stanić, Miloš, Savić, Ljubodrag, "Spillway Design Optimization for Embankment Dams Using Genetic Algorithms" in Uniting Europe for clean water: cross-border cooperation of old, new and candidate countries of EU for identifying problems, finding causes and solutions : book of abstracts (2017):138-145,
https://hdl.handle.net/21.15107/rcub_grafar_1564 .

TY  - CONF
AU  - Ljubičić, Robert
AU  - Babić, Filip
AU  - Zindović, Budo
AU  - Kapor, Radomir
AU  - Savić, Ljubodrag
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1523
PB  - Građevinski fakultet, Subotica
C3  - Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017
T1  - Estimation of downstream sequent depth in B-F hydraulic jumps for stilling basins of stepped spillways
T1  - Proračun spregnute dubine u hidrauličkom skoku B-F tipa kod umirujućih bazena stepenastih brzotoka
EP  - 644
SP  - 635
VL  - 33
DO  - 10.14415/konferencijagfs2017.068
ER  - 

@conference{
author = "Ljubičić, Robert and Babić, Filip and Zindović, Budo and Kapor, Radomir and Savić, Ljubodrag",
year = "2017",
publisher = "Građevinski fakultet, Subotica",
journal = "Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017",
title = "Estimation of downstream sequent depth in B-F hydraulic jumps for stilling basins of stepped spillways, Proračun spregnute dubine u hidrauličkom skoku B-F tipa kod umirujućih bazena stepenastih brzotoka",
pages = "644-635",
volume = "33",
doi = "10.14415/konferencijagfs2017.068"
}

Ljubičić, R., Babić, F., Zindović, B., Kapor, R.,& Savić, L.. (2017). Estimation of downstream sequent depth in B-F hydraulic jumps for stilling basins of stepped spillways. in Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017
Građevinski fakultet, Subotica., 33, 635-644.
https://doi.org/10.14415/konferencijagfs2017.068

Ljubičić R, Babić F, Zindović B, Kapor R, Savić L. Estimation of downstream sequent depth in B-F hydraulic jumps for stilling basins of stepped spillways. in Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017. 2017;33:635-644.
doi:10.14415/konferencijagfs2017.068 .

Ljubičić, Robert, Babić, Filip, Zindović, Budo, Kapor, Radomir, Savić, Ljubodrag, "Estimation of downstream sequent depth in B-F hydraulic jumps for stilling basins of stepped spillways" in Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017, 33 (2017):635-644,
https://doi.org/10.14415/konferencijagfs2017.068 . .

TY  - CONF
AU  - Ljubičić, Robert
AU  - Zindović, Budo
AU  - Milovanović, Bojan
AU  - Kapor, Radomir
AU  - Savić, Ljubodrag
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1468
AB  - The influence of converging stepped spillways on dimensions of the stilling basins for RCC dams was studied, based on the results of physical modeling, existing empirical expressions, and basic laws of fluid mechanics and hydraulics. The study includes analysis of parameters that affect the magnitude of a hydrodynamic force which is transferred into the stilling basin, and presents an original design methodology. A procedure for simplifying the optimization process for the entire spillway is proposed.
PB  - Građevinski fakultet, Subotica
C3  - Zbornik radova 4. Međunarodne konferencije Savremena dostignuća u građevinarstvu 2016
T1  - Hydraulic computation of converging stepped-chute stilling basin
T1  - Hidraulički proračun umirujućeg bazena neprizmatičnog stepenastog brzotoka
EP  - 688
SP  - 679
VL  - 32
DO  - 10.14415/konferencijaGFS2016.069
ER  - 

@conference{
author = "Ljubičić, Robert and Zindović, Budo and Milovanović, Bojan and Kapor, Radomir and Savić, Ljubodrag",
year = "2016",
abstract = "The influence of converging stepped spillways on dimensions of the stilling basins for RCC dams was studied, based on the results of physical modeling, existing empirical expressions, and basic laws of fluid mechanics and hydraulics. The study includes analysis of parameters that affect the magnitude of a hydrodynamic force which is transferred into the stilling basin, and presents an original design methodology. A procedure for simplifying the optimization process for the entire spillway is proposed.",
publisher = "Građevinski fakultet, Subotica",
journal = "Zbornik radova 4. Međunarodne konferencije Savremena dostignuća u građevinarstvu 2016",
title = "Hydraulic computation of converging stepped-chute stilling basin, Hidraulički proračun umirujućeg bazena neprizmatičnog stepenastog brzotoka",
pages = "688-679",
volume = "32",
doi = "10.14415/konferencijaGFS2016.069"
}

Ljubičić, R., Zindović, B., Milovanović, B., Kapor, R.,& Savić, L.. (2016). Hydraulic computation of converging stepped-chute stilling basin. in Zbornik radova 4. Međunarodne konferencije Savremena dostignuća u građevinarstvu 2016
Građevinski fakultet, Subotica., 32, 679-688.
https://doi.org/10.14415/konferencijaGFS2016.069

Ljubičić R, Zindović B, Milovanović B, Kapor R, Savić L. Hydraulic computation of converging stepped-chute stilling basin. in Zbornik radova 4. Međunarodne konferencije Savremena dostignuća u građevinarstvu 2016. 2016;32:679-688.
doi:10.14415/konferencijaGFS2016.069 .

Ljubičić, Robert, Zindović, Budo, Milovanović, Bojan, Kapor, Radomir, Savić, Ljubodrag, "Hydraulic computation of converging stepped-chute stilling basin" in Zbornik radova 4. Međunarodne konferencije Savremena dostignuća u građevinarstvu 2016, 32 (2016):679-688,
https://doi.org/10.14415/konferencijaGFS2016.069 . .

TY  - JOUR
AU  - Ljubičić, Robert
AU  - Zindović, Budo
AU  - Milovanović, Bojan
AU  - Kapor, Radomir
AU  - Savić, Ljubodrag
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/731
AB  - The influence of converging stepped spillways on the dimensions of the stilling basins for RCC dams was examined, based on the results of physical modeling, existing empirical expressions, and basic laws of fluid mechanics and hydraulics. The study includes analysis of parameters that affect the magnitude of the hydrodynamic force which is transferred into the stilling basin, and presents an original design methodology. Analysis of the measured data and the methods for estimation of the sequent depth in the stilling basin are presented, with recommendations for design purposes and future studies.
AB  - Cilj rada je da se na osnovu zakona mehanike fluida, postojećih rezultata modelskih ispitivanja i empirijskih izraza, analizira uticaj neprizmatičnosti stepenastog brzotoka na potrebne dimenzije umirujućih bazena kod gravitacionih betonskih brana. Analizirani su parametri koji utiču na sile od vode na ulasku u umirujući bazen, na osnovu kojih je predložena metodologija za dimenzionisanje umirujućih bazena. Na osnovu merenja na fizičkom hidrauličkom modelu, upoređeni su rezultati proračuna razmatranih metoda i na osnovu njih date preporuke, kako za projektovanje, tako i za buduća istraživanja.
PB  - Jugoslovensko društvo za odvodnjavanje i navodnjavanje, Beograd
T2  - Vodoprivreda
T1  - Methodology for sequent depth estimation for converging stepped-chute stilling basins
T1  - Metodologija proračuna spregnutih dubina kod umirujućih bazena neprizmatičnih stepenastih brzotoka
EP  - 94
IS  - 1-3
SP  - 87
VL  - 48
UR  - https://hdl.handle.net/21.15107/rcub_grafar_731
ER  - 

@article{
author = "Ljubičić, Robert and Zindović, Budo and Milovanović, Bojan and Kapor, Radomir and Savić, Ljubodrag",
year = "2016",
abstract = "The influence of converging stepped spillways on the dimensions of the stilling basins for RCC dams was examined, based on the results of physical modeling, existing empirical expressions, and basic laws of fluid mechanics and hydraulics. The study includes analysis of parameters that affect the magnitude of the hydrodynamic force which is transferred into the stilling basin, and presents an original design methodology. Analysis of the measured data and the methods for estimation of the sequent depth in the stilling basin are presented, with recommendations for design purposes and future studies., Cilj rada je da se na osnovu zakona mehanike fluida, postojećih rezultata modelskih ispitivanja i empirijskih izraza, analizira uticaj neprizmatičnosti stepenastog brzotoka na potrebne dimenzije umirujućih bazena kod gravitacionih betonskih brana. Analizirani su parametri koji utiču na sile od vode na ulasku u umirujući bazen, na osnovu kojih je predložena metodologija za dimenzionisanje umirujućih bazena. Na osnovu merenja na fizičkom hidrauličkom modelu, upoređeni su rezultati proračuna razmatranih metoda i na osnovu njih date preporuke, kako za projektovanje, tako i za buduća istraživanja.",
publisher = "Jugoslovensko društvo za odvodnjavanje i navodnjavanje, Beograd",
journal = "Vodoprivreda",
title = "Methodology for sequent depth estimation for converging stepped-chute stilling basins, Metodologija proračuna spregnutih dubina kod umirujućih bazena neprizmatičnih stepenastih brzotoka",
pages = "94-87",
number = "1-3",
volume = "48",
url = "https://hdl.handle.net/21.15107/rcub_grafar_731"
}

Ljubičić, R., Zindović, B., Milovanović, B., Kapor, R.,& Savić, L.. (2016). Methodology for sequent depth estimation for converging stepped-chute stilling basins. in Vodoprivreda
Jugoslovensko društvo za odvodnjavanje i navodnjavanje, Beograd., 48(1-3), 87-94.
https://hdl.handle.net/21.15107/rcub_grafar_731

Ljubičić R, Zindović B, Milovanović B, Kapor R, Savić L. Methodology for sequent depth estimation for converging stepped-chute stilling basins. in Vodoprivreda. 2016;48(1-3):87-94.
https://hdl.handle.net/21.15107/rcub_grafar_731 .

Ljubičić, Robert, Zindović, Budo, Milovanović, Bojan, Kapor, Radomir, Savić, Ljubodrag, "Methodology for sequent depth estimation for converging stepped-chute stilling basins" in Vodoprivreda, 48, no. 1-3 (2016):87-94,
https://hdl.handle.net/21.15107/rcub_grafar_731 .