Effects of tributary floodplain on confluence hydrodynamics

Confluences are common components of river networks and are characterized by a highly complex flow structure. Two confluence geometries, without and with the floodplain in the tributary, were comparatively investigated to highlight the effects of floodplain on confluence hydrodynamics. The three-dim...

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Bibliographic Details
Published in:Journal of hydraulic research Vol. 61; no. 4; pp. 552 - 572
Main Authors: Yuan, Saiyu, Yan, Guanghui, Tang, Hongwu, Xiao, Yang, Rahimi, Hamidreza, Aye, Moe Nandar, Gualtieri, Carlo
Format: Journal Article
Language:English
Published: Madrid Taylor & Francis 04.07.2023
Taylor & Francis Ltd
Subjects:
ADV
Energy distribution
floodplain
Floodplains
Flow separation
Flow structures
Fluid flow
Fluid mechanics
High flow
Hydrodynamics
Kinetic energy
Lakes
Ocean circulation
River confluence
River networks
Rivers
Separation
separation zone
Shear
shear layer
Shear layers
Shear stress
Spatial distribution
Streamlines
Tributaries
Upwelling
Velocity distribution
ISSN:0022-1686, 1814-2079
Online Access:Get full text
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Summary:Confluences are common components of river networks and are characterized by a highly complex flow structure. Two confluence geometries, without and with the floodplain in the tributary, were comparatively investigated to highlight the effects of floodplain on confluence hydrodynamics. The three-dimensional velocity field and the spatial distribution of turbulent kinetic energy and Reynolds shear stresses were analysed. In the second geometry, a tilted shear layer was observed, which was related to the flow expansion from the main channel into the tributary. Significant secondary motions are mainly related to the fluid upwelling in the lee of the floodplain step and streamline curvature. A wider flow separation zone was found, while the length of the separation zone was not affected by the floodplain flow. The results could be useful to understand the complex hydrodynamics of the large confluence between the Yangtze River and the Poyang Lake, characterized from a floodplain under high flow conditions.
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ISSN:0022-1686
1814-2079
DOI:10.1080/00221686.2023.2231413