Erosion-deposition patterns and depo-center movements in branching channels at the near-estuary reach of the Yangtze River

doi:10.1007/s11707-019-0808-2

Frontiers of Earth Science

2020, Vol. 14

Issue (3): 537-552 https://doi.org/10.1007/s11707-019-0808-2

本期目录

Erosion-deposition patterns and depo-center movements in branching channels at the near-estuary reach of the Yangtze River

Boyuan ZHU^1,²(

), Jinyun DENG³, Jinwu TANG⁴, Wenjun YU⁵, Alistair G.L. BORTHWICK⁶, Yuanfang CHAI⁷, Zhaohua SUN³, Yitian LI³

¹. School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China
². Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, China
³. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
⁴. Changjiang Institute of Survey, Planning, Design and Research, Wuhan 430010, China
⁵. Changjiang Waterway Institute of Planning, Design & Research, Wuhan 430040, China
⁶. School of Engineering, The University of Edinburgh, The King’s Buildings, Edinburgh EH9 3JL, UK
⁷. Department of Earth Sciences, Vrije Universiteit Amsterdam, Boelelaan 1085, 1081 HV Amsterdam, The Netherlands

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Abstract：

Channel evolution and depo-center migrations in braided reaches are significantly influenced by variations in runoff. This study examines the effect of runoff variations on the erosion-deposition patterns and depo-center movements within branching channels of the near-estuary reach of the Yangtze River. We assume that variations in annual mean duration days of runoff discharges, ebb partition ratios in branching channels, and the erosional/depositional rates of entire channels and sub-reaches are representative of variations in runoff intensity, flow dynamics in branching channels, and morphological features in the channels. Our results show that the north region of Fujiangsha Waterway, the Liuhaisha branch of Rugaosha Waterway, the west branch of Tongzhousha Waterway, and the west branch of Langshansha Waterway experience deposition or reduced erosion under low runoff intensity, and erosion or reduced deposition under high runoff intensity, with the depo-centers moving upstream and downstream, respectively. Other waterway branches undergo opposite trends in erosion-deposition patterns and depo-center movements as the runoff changes. These morphological changes may be associated with trends in ebb partition ratio as the runoff discharge rises and falls. By flattening the intra-annual distribution of runoff discharge, dam construction in the Yangtze Basin has altered the ebb partition ratios in waterway branches, affecting their erosion-deposition patterns and depo-center movements. Present trends are likely to continue into the future due to the succession of large cascade dams under construction along the upper Yangtze and ongoing climate change.

Key words： near-estuary reach Yangtze River runoff discharge ebb partition ratio erosion-deposition pattern depo-center movement

收稿日期: 2019-08-10 出版日期: 2020-12-04

Corresponding Author(s): Boyuan ZHU

引用本文:

. [J]. Frontiers of Earth Science, 2020, 14(3): 537-552.
Boyuan ZHU, Jinyun DENG, Jinwu TANG, Wenjun YU, Alistair G.L. BORTHWICK, Yuanfang CHAI, Zhaohua SUN, Yitian LI. Erosion-deposition patterns and depo-center movements in branching channels at the near-estuary reach of the Yangtze River. Front. Earth Sci., 2020, 14(3): 537-552.

链接本文:

https://academic.hep.com.cn/fesci/CN/10.1007/s11707-019-0808-2
https://academic.hep.com.cn/fesci/CN/Y2020/V14/I3/537

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