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Secondary Flow Effects on Deposition of Cohesive Sediment in a Meandering Reach of Yangtze River

1
State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
2
National Inland Waterway Regulation Engineering Research Center, Chongqing Jiaotong University, Chongqing 400074, China
*
Author to whom correspondence should be addressed.
Water 2019, 11(7), 1444; https://doi.org/10.3390/w11071444
Received: 27 May 2019 / Revised: 28 June 2019 / Accepted: 9 July 2019 / Published: 12 July 2019
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Abstract

Few researches focus on secondary flow effects on bed deformation caused by cohesive sediment deposition in meandering channels of field mega scale. A 2D depth-averaged model is improved by incorporating three submodels to consider different effects of secondary flow and a module for cohesive sediment transport. These models are applied to a meandering reach of Yangtze River to investigate secondary flow effects on cohesive sediment deposition, and a preferable submodel is selected based on the flow simulation results. Sediment simulation results indicate that the improved model predictions are in better agreement with the measurements in planar distribution of deposition, as the increased sediment deposits caused by secondary current on the convex bank have been well predicted. Secondary flow effects on the predicted amount of deposition become more obvious during the period when the sediment load is low and velocity redistribution induced by the bed topography is evident. Such effects vary with the settling velocity and critical shear stress for deposition of cohesive sediment. The bed topography effects can be reflected by the secondary flow submodels and play an important role in velocity and sediment deposition predictions. View Full-Text
Keywords: secondary flow; cohesive; deposition; 2D depth-averaged model; meandering; Yangtze River secondary flow; cohesive; deposition; 2D depth-averaged model; meandering; Yangtze River
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Qin, C.; Shao, X.; Xiao, Y. Secondary Flow Effects on Deposition of Cohesive Sediment in a Meandering Reach of Yangtze River. Water 2019, 11, 1444.

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