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On the effect of bed elevation discordance in confluences with unequal channel widths

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2018
ACE2018-DejanaDjordjevic.pdf (12.07Mb)
Authors
Đorđević, Dejana
Contributors
Ramyar, Kambiz
Conference object (Published version)
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Dejana Đorđević
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Abstract
The paper studies the effect of bed elevation discordance on the hydrodynamics in fixed-bed open channel confluences where the tributary channel is narrower than the main channel and where the flow is subcritical. The study is inspired by two facts: 1) that the main river is wider than the tributary in majority of cases and 2) that the bed elevation discordance is a usual morphological feature in alluvial river confluences. To this aim nine confluence layouts with three channel width ratios BT / BMR = {1.00, 0.75, 0.50} and three extents of bed elevation discordance ΔzT / hd = {0.10, 0.25, 0.50} are analysed under the three possible hydrological scenarios defined by the discharge ratio values DR = QMR / Qtot ={0.250, 0.583, 0.750}. It is found that: 1) the tributary flow acts as a jet when DR = 0.250 regardless of the BT / BMR and ΔzT / hd values, 2) the recirculation zone with several vortices exists throughout the flow depth when DR = 0.250 and BT < BMR, 3) the primar...y vortex is shifted farther downstream and the secondary one is inclined and attached to the boundary streamline, 4) the strong shear exists both in the horizontal and vertical planes and 5) the shear layer is developed on each side of the inclined recirculation zone.

Keywords:
river confluence / bed elevation discordance / channel width ratio / 3D numerical model
Source:
Proceedings of 13th International Congress on Advances in Civil Engineering, 2018, 1/84693-8
Publisher:
  • EGE University, Izmir, Turkey
Projects:
  • Monitoring and Modeling of Rivers and Reservoirs (MORE) - Physical, Chemical, Biological and Morphodynamic Parameters (RS-37009)
  • Urban Drainage Systems as Key Infrastructure in Cities and Towns (RS-37010)
Note:
  • Zbornik radova je izdat na USB memoriji i nema ISBN broj
[ Google Scholar ]
URI
https://grafar.grf.bg.ac.rs/handle/123456789/2294
Collections
  • Radovi istraživača / Researcher's publications
Institution
GraFar
TY  - CONF
AU  - Đorđević, Dejana
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2294
AB  - The paper studies the effect of bed elevation discordance on the hydrodynamics in fixed-bed open channel 
confluences where the tributary channel is narrower than the main channel and where the flow is subcritical. The
study is inspired by two facts: 1) that the main river is wider than the tributary in majority of cases and 2) that the 
bed elevation discordance is a usual morphological feature in alluvial river confluences. To this aim nine
confluence layouts with three channel width ratios BT / BMR = {1.00, 0.75, 0.50} and three extents of bed 
elevation discordance ΔzT / hd  = {0.10, 0.25, 0.50} are analysed under the three possible hydrological scenarios
defined by the discharge ratio values DR = QMR / Qtot ={0.250, 0.583, 0.750}. It is found that: 1) the tributary flow 
acts as a jet when DR = 0.250 regardless of the BT / BMR and ΔzT / hd  values, 2) the recirculation zone with several 
vortices exists throughout the flow depth when DR = 0.250 and BT  < BMR, 3) the primary vortex is shifted farther 
downstream and the secondary one is inclined and attached to the boundary streamline, 4) the strong shear exists
both in the horizontal and vertical planes and 5) the shear layer is developed on each side of the inclined 
recirculation zone.
PB  - EGE University, Izmir, Turkey
C3  - Proceedings of 13th International Congress on Advances in Civil Engineering
T1  - On the effect of bed elevation discordance in confluences with unequal channel widths
EP  - 8
SP  - 1/84693
ER  - 
@conference{
author = "Đorđević, Dejana",
year = "2018",
url = "https://grafar.grf.bg.ac.rs/handle/123456789/2294",
abstract = "The paper studies the effect of bed elevation discordance on the hydrodynamics in fixed-bed open channel 
confluences where the tributary channel is narrower than the main channel and where the flow is subcritical. The
study is inspired by two facts: 1) that the main river is wider than the tributary in majority of cases and 2) that the 
bed elevation discordance is a usual morphological feature in alluvial river confluences. To this aim nine
confluence layouts with three channel width ratios BT / BMR = {1.00, 0.75, 0.50} and three extents of bed 
elevation discordance ΔzT / hd  = {0.10, 0.25, 0.50} are analysed under the three possible hydrological scenarios
defined by the discharge ratio values DR = QMR / Qtot ={0.250, 0.583, 0.750}. It is found that: 1) the tributary flow 
acts as a jet when DR = 0.250 regardless of the BT / BMR and ΔzT / hd  values, 2) the recirculation zone with several 
vortices exists throughout the flow depth when DR = 0.250 and BT  < BMR, 3) the primary vortex is shifted farther 
downstream and the secondary one is inclined and attached to the boundary streamline, 4) the strong shear exists
both in the horizontal and vertical planes and 5) the shear layer is developed on each side of the inclined 
recirculation zone.",
publisher = "EGE University, Izmir, Turkey",
journal = "Proceedings of 13th International Congress on Advances in Civil Engineering",
title = "On the effect of bed elevation discordance in confluences with unequal channel widths",
pages = "8-1/84693"
}
Đorđević D. On the effect of bed elevation discordance in confluences with unequal channel widths. Proceedings of 13th International Congress on Advances in Civil Engineering. 2018;:1/84693-8
Đorđević, D. (2018). On the effect of bed elevation discordance in confluences with unequal channel widths.
Proceedings of 13th International Congress on Advances in Civil EngineeringEGE University, Izmir, Turkey., 1/84693-8.
Đorđević Dejana, "On the effect of bed elevation discordance in confluences with unequal channel widths" (2018):1/84693-8

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