On the effect of bed elevation discordance in confluences with unequal channel widths
Конференцијски прилог (Објављена верзија)
,
Dejana Đorđević
Метаподаци
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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.
Кључне речи:
river confluence / bed elevation discordance / channel width ratio / 3D numerical modelИзвор:
Proceedings of 13th International Congress on Advances in Civil Engineering, 2018, 1/84693-8Издавач:
- EGE University, Izmir, Turkey
Финансирање / пројекти:
- Мерење и моделирање физичких, хемијских, биолошких и морфодинамичких параметара река и водних акумулација (RS-MESTD-Technological Development (TD or TR)-37009)
- Системи за одвођење кишних вода као део урбане и саобраћајне инфраструктуре (RS-MESTD-Technological Development (TD or TR)-37010)
Напомена:
- Zbornik radova je izdat na USB memoriji i nema ISBN broj
Институција/група
GraFarTY - CONF AU - Đorđević, Dejana PY - 2018 UR - https://grafar.grf.bg.ac.rs/handle/123456789/2294 AB - The paper studies the effect of bed elevation discordance on the hydrodynamics in fixed-bed open channel confluences where the tributary channel is narrower than the main channel and where the flow is subcritical. The study is inspired by two facts: 1) that the main river is wider than the tributary in majority of cases and 2) that the bed elevation discordance is a usual morphological feature in alluvial river confluences. To this aim nine confluence layouts with three channel width ratios BT / BMR = {1.00, 0.75, 0.50} and three extents of bed elevation discordance ΔzT / hd = {0.10, 0.25, 0.50} are analysed under the three possible hydrological scenarios defined by the discharge ratio values DR = QMR / Qtot ={0.250, 0.583, 0.750}. It is found that: 1) the tributary flow acts as a jet when DR = 0.250 regardless of the BT / BMR and ΔzT / hd values, 2) the recirculation zone with several vortices exists throughout the flow depth when DR = 0.250 and BT < BMR, 3) the primary vortex is shifted farther downstream and the secondary one is inclined and attached to the boundary streamline, 4) the strong shear exists both in the horizontal and vertical planes and 5) the shear layer is developed on each side of the inclined recirculation zone. PB - EGE University, Izmir, Turkey C3 - Proceedings of 13th International Congress on Advances in Civil Engineering T1 - On the effect of bed elevation discordance in confluences with unequal channel widths EP - 8 SP - 1/84693 UR - https://hdl.handle.net/21.15107/rcub_grafar_2294 ER -
@conference{ author = "Đorđević, Dejana", year = "2018", abstract = "The paper studies the effect of bed elevation discordance on the hydrodynamics in fixed-bed open channel confluences where the tributary channel is narrower than the main channel and where the flow is subcritical. The study is inspired by two facts: 1) that the main river is wider than the tributary in majority of cases and 2) that the bed elevation discordance is a usual morphological feature in alluvial river confluences. To this aim nine confluence layouts with three channel width ratios BT / BMR = {1.00, 0.75, 0.50} and three extents of bed elevation discordance ΔzT / hd = {0.10, 0.25, 0.50} are analysed under the three possible hydrological scenarios defined by the discharge ratio values DR = QMR / Qtot ={0.250, 0.583, 0.750}. It is found that: 1) the tributary flow acts as a jet when DR = 0.250 regardless of the BT / BMR and ΔzT / hd values, 2) the recirculation zone with several vortices exists throughout the flow depth when DR = 0.250 and BT < BMR, 3) the primary vortex is shifted farther downstream and the secondary one is inclined and attached to the boundary streamline, 4) the strong shear exists both in the horizontal and vertical planes and 5) the shear layer is developed on each side of the inclined recirculation zone.", publisher = "EGE University, Izmir, Turkey", journal = "Proceedings of 13th International Congress on Advances in Civil Engineering", title = "On the effect of bed elevation discordance in confluences with unequal channel widths", pages = "8-1/84693", url = "https://hdl.handle.net/21.15107/rcub_grafar_2294" }
Đorđević, D.. (2018). On the effect of bed elevation discordance in confluences with unequal channel widths. in Proceedings of 13th International Congress on Advances in Civil Engineering EGE University, Izmir, Turkey., 1/84693-8. https://hdl.handle.net/21.15107/rcub_grafar_2294
Đorđević D. On the effect of bed elevation discordance in confluences with unequal channel widths. in Proceedings of 13th International Congress on Advances in Civil Engineering. 2018;:1/84693-8. https://hdl.handle.net/21.15107/rcub_grafar_2294 .
Đorđević, Dejana, "On the effect of bed elevation discordance in confluences with unequal channel widths" in Proceedings of 13th International Congress on Advances in Civil Engineering (2018):1/84693-8, https://hdl.handle.net/21.15107/rcub_grafar_2294 .