A role of the difference in bed elevations in the main-river (Delta z(MR)) at its entrance to a 90 degrees straight-channels' confluence is studied numerically using a 3D finite-volume model. Three characteristic hydrological scenarios with D-R = {0.250, 0.583, 0.750} are analysed in four confluence layouts having Delta z(MR)/hd is an element of[ 0.0, 0.50] (where h(d) stands for the flow depth in the deeper canal at the confluence). It is found that: 1) a portion of the tributary flow in the bottom layers is entrained by the bed-step, 2) the w-velocity has the same order of magnitude as V-xy for Delta z(MR) >= 0.25 h(d) and D-R gt 0.5, 3) the opposite bank is endangered by erosion due to strong upward motion along this bank, 4) additional shear layer develops on the outer side of the distorted u(max)-core and 5) the presence of bed-step favours bed-load transport both in and far downstream of the confluence.
Source:
Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2014, 2014, 997-1005
TY - CONF
AU - Đorđević, Dejana
PY - 2014
UR - https://grafar.grf.bg.ac.rs/handle/123456789/602
AB - A role of the difference in bed elevations in the main-river (Delta z(MR)) at its entrance to a 90 degrees straight-channels' confluence is studied numerically using a 3D finite-volume model. Three characteristic hydrological scenarios with D-R = {0.250, 0.583, 0.750} are analysed in four confluence layouts having Delta z(MR)/hd is an element of[ 0.0, 0.50] (where h(d) stands for the flow depth in the deeper canal at the confluence). It is found that: 1) a portion of the tributary flow in the bottom layers is entrained by the bed-step, 2) the w-velocity has the same order of magnitude as V-xy for Delta z(MR) >= 0.25 h(d) and D-R gt 0.5, 3) the opposite bank is endangered by erosion due to strong upward motion along this bank, 4) additional shear layer develops on the outer side of the distorted u(max)-core and 5) the presence of bed-step favours bed-load transport both in and far downstream of the confluence.
PB - CRC Press/Balkema
C3 - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2014
T1 - Effect of bed elevation discordance in the main river on the confluence hydrodynamics in 90 degrees straight-channels' confluences
EP - 1005
SP - 997
UR - https://hdl.handle.net/21.15107/rcub_grafar_602
ER -
@conference{
author = "Đorđević, Dejana",
year = "2014",
abstract = "A role of the difference in bed elevations in the main-river (Delta z(MR)) at its entrance to a 90 degrees straight-channels' confluence is studied numerically using a 3D finite-volume model. Three characteristic hydrological scenarios with D-R = {0.250, 0.583, 0.750} are analysed in four confluence layouts having Delta z(MR)/hd is an element of[ 0.0, 0.50] (where h(d) stands for the flow depth in the deeper canal at the confluence). It is found that: 1) a portion of the tributary flow in the bottom layers is entrained by the bed-step, 2) the w-velocity has the same order of magnitude as V-xy for Delta z(MR) >= 0.25 h(d) and D-R gt 0.5, 3) the opposite bank is endangered by erosion due to strong upward motion along this bank, 4) additional shear layer develops on the outer side of the distorted u(max)-core and 5) the presence of bed-step favours bed-load transport both in and far downstream of the confluence.",
publisher = "CRC Press/Balkema",
journal = "Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2014",
title = "Effect of bed elevation discordance in the main river on the confluence hydrodynamics in 90 degrees straight-channels' confluences",
pages = "1005-997",
url = "https://hdl.handle.net/21.15107/rcub_grafar_602"
}
Đorđević, D.. (2014). Effect of bed elevation discordance in the main river on the confluence hydrodynamics in 90 degrees straight-channels' confluences. in Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2014
CRC Press/Balkema., 997-1005.
https://hdl.handle.net/21.15107/rcub_grafar_602
Đorđević D. Effect of bed elevation discordance in the main river on the confluence hydrodynamics in 90 degrees straight-channels' confluences. in Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2014. 2014;:997-1005.
https://hdl.handle.net/21.15107/rcub_grafar_602 .
Đorđević, Dejana, "Effect of bed elevation discordance in the main river on the confluence hydrodynamics in 90 degrees straight-channels' confluences" in Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2014 (2014):997-1005,
https://hdl.handle.net/21.15107/rcub_grafar_602 .
