Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR028534 |
Secondary flow and flow redistribution in two sharp bends on the Middle Yangtze River | |
Shanshan Deng; Junqiang Xia; Meirong Zhou; Zhiwei Li; Guanglei Duan; Jian Shen; Koen Blanckaert | |
2021-09-22 | |
发表期刊 | Water Resources Research
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出版年 | 2021 |
英文摘要 | It remains an open question whether the state of knowledge on bend hydrodynamics applies to sharp bends in the largest river systems on Earth. This paper reports a field investigation into the hydrodynamics in two consecutive sharp bends of the Middle Yangtze River (MYR), and demonstrates that the reduced-order model of Blanckaert and de Vriend is able to resolve the secondary flow strength and continuous flow redistribution in rivers of this size to high accuracy. Consequently, the model has been validated over the entire range of scales. These two bends show similarities to those of smaller size in terms of bathymetry, flow redistribution and secondary flow evolution. The transverse location of the core of maximum velocity along the bends lags behind the thalweg by approximately half a width. A centre-region cell of secondary flow develops over the outer bank near the apex, and gradually decays downstream until it completely vanishes at the bend exit. Both bends are mildly curved from the perspective of hydrodynamic modelling, with a weak interaction between the secondary flow and primary flow, although they are sharply curved from the perspective of geomorphology (width/radius >0.5). A term-by-term analysis of the model indicates that the flow redistribution is primarily controlled by the planimetric changes in curvature and by topographic steering, and is slightly influenced by the secondary flow. However, the secondary flow may indirectly affect the flow redistribution through conditioning the bed topography. Important knowledge gaps remain with respect to the coupling between the hydrodynamic and morphological processes. This article is protected by copyright. All rights reserved. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/338759 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Shanshan Deng,Junqiang Xia,Meirong Zhou,et al. Secondary flow and flow redistribution in two sharp bends on the Middle Yangtze River[J]. Water Resources Research,2021. |
APA | Shanshan Deng.,Junqiang Xia.,Meirong Zhou.,Zhiwei Li.,Guanglei Duan.,...&Koen Blanckaert.(2021).Secondary flow and flow redistribution in two sharp bends on the Middle Yangtze River.Water Resources Research. |
MLA | Shanshan Deng,et al."Secondary flow and flow redistribution in two sharp bends on the Middle Yangtze River".Water Resources Research (2021). |
条目包含的文件 | 条目无相关文件。 |
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