Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR028284 |
Hydrodynamics, sediment transport and morphological features at the confluence between the Yangtze River and the Poyang Lake | |
Saiyu Yuan; Hongwu Tang; Kun Li; Lei Xu; Yang Xiao; Carlo Gualtieri; Colin Rennie; Bruce Melville | |
2021-02-20 | |
发表期刊 | Water Resources Research |
出版年 | 2021 |
英文摘要 | Confluences act as critical nodes in a river network as they affect flow, sediment transport, water quality and ecological patterns. A complete knowledge about hydro‐morpho‐sedimentary processes at river confluences is still incompleted and it has been usually accepted that secondary flows are weak because of the significant role of form roughness in large rivers. In this study, two field surveys were conducted on the flow structure, suspended sediment transport and morphology of the confluence between the Yangtze River (the largest river in China) and the Poyang Lake (the largest freshwater lake in China). Dual counter‐rotating cells were observed during high flow conditions and a single secondary cell appeared in low flow conditions. These helical cells restricted the core size of high sediment concentration and downwelling flows acted as a barrier hindering the exchange of sediment between the two rivers. Furthermore, the observed large scour hole was likely related to the downwelling and upwelling flows caused by helical motions. In low flow conditions the scour hole looked like a deep channel, which was likely related to a long‐surviving helical cell. The scour hole disappeared further downstream, when either the helical motion got weak during low flow conditions, or when a reverse helical cell occurred during high flow conditions. Hydrodynamics, suspended sediment transport and morphological features observed at such a large confluence demonstrated that river planform geometry and discharge ratio affected the flow structure, especially the helical motion. This in turn affected sediment transport as well as the local bed morphology. 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/315618 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Saiyu Yuan,Hongwu Tang,Kun Li,et al. Hydrodynamics, sediment transport and morphological features at the confluence between the Yangtze River and the Poyang Lake[J]. Water Resources Research,2021. |
APA | Saiyu Yuan.,Hongwu Tang.,Kun Li.,Lei Xu.,Yang Xiao.,...&Bruce Melville.(2021).Hydrodynamics, sediment transport and morphological features at the confluence between the Yangtze River and the Poyang Lake.Water Resources Research. |
MLA | Saiyu Yuan,et al."Hydrodynamics, sediment transport and morphological features at the confluence between the Yangtze River and the Poyang Lake".Water Resources Research (2021). |
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