水科学进展2017，Vol.28Issue(2)：193-202,10.DOI:10.14042/j.cnki.32.1309.2017.02.004
三峡水库蓄水后下荆江急弯河道凸冲凹淤成因
Fluvial processes of meandering channels in the Lower Jingjiang River reach after the impoundment of Three Gorges Reservior
摘要
Abstract
The sediment discharge has been reduced sharply since the operation of Three Gorges Project in 2003, leading to the severe erosion of Lower Jingjiang Reach ( LJR) , a representative meandering channel located in the middle of Yangtze River. Some sharp bends in LJR are unusually undergoing convex bank erosion and concave bank deposition resulting in submerged shoal, which are contrary to the basic fundamentals of curved riverbed evolution. These abnormal riverbed deformations induce changes in flood control, waterway condition and the relationship between Yangtze River and Dongting Lake, and indeed the corresponding mechanism needs to be investigated. In the paper, based on a number of field data, the characteristics of riverbed evolution and channel morphology adjustments are fully demonstrated by quantitative statistics of erosion-deposition distribution and channel morphology for selected curved reaches. The results indicate that the annual redistribution of flow, the reduction of sediment discharge and mu-tation of sediment gradation are the dominant causes.关键词
急弯段/凸冲凹淤/中水历时/三峡水库Key words
meandering channel/convex bank erosion & concave bank deposition/intermediate flow duration/the Three Gorges Reservoir分类
建筑与水利引用本文复制引用
朱玲玲,许全喜,熊明..三峡水库蓄水后下荆江急弯河道凸冲凹淤成因[J].水科学进展,2017,28(2):193-202,10.基金项目
水利部公益性行业科研专项经费资助项目(201401021) （201401021）
国家自然科学基金资助项目(51579186) The study is financially supported by the National Natural Science Foundation of China(No. 51579186) . （51579186）
