水科学进展2013，Vol.24Issue(2)：205-211,7.
水沙调节后荆江典型河道横向调整过程的响应——Ⅱ.上、下荆江调整差异初探
Responses of channel migration to changes of flow and sediment regime in the Jingjiang reach of the middle Yangtze River: Ⅱ :Differences between upper and lower sections
摘要
Abstract
The flow and sediment regimes downstream of Three Gorges Reservoir have undergone a significant change since the beginning of its impoundment in June 2003. Accordingly, the spatial variations in downstream channel morphology will be adjusted, in particular in the Jingjiang reach of the middle Yangtze River with eroded bank materials. In this study, the lateral migrations of channels in the Jingjiang reach in response to changes in flow and sediment regimes are investigated. The turbulent flow and sediment transport as well as the bank erosion process are simulated by two- and three dimensional numerical models. No significant changes can be found in the overall evolution of channel planform in the Shishou segment in the lower Jingjiang reach. However, localized bank collapses and plane deformations are likely to intensify due to the reduction of sediment transport, especially on the apex of bend. For the Shashi-Xinchang segment in the upper Jingjiang reach, the overall evolution of channel planform is reduced compared to that before reservoir impoundment. Up to 50% reduction can be expected in some local segments.关键词
水沙调节/三峡工程/河道演变/荆江/横向调整/数值模拟Key words
changes in flow and sediment regimes/Three Gorges Project/fluvial processes/Jingjiang reach of middle Yangtze River/channel migration/numerical simulation分类
建筑与水利引用本文复制引用
假冬冬,邵学军,蒋海峰,沈阳,张幸农,尚毅梓..水沙调节后荆江典型河道横向调整过程的响应——Ⅱ.上、下荆江调整差异初探[J].水科学进展,2013,24(2):205-211,7.基金项目
国家重点基础研究发展计划(973计划)资助项目(2012CB417002) （973计划）
国家自然科学基金资助项目(51109140) （51109140）
