长江下游贵池河段凤凰洲右汊萎缩原因分析  

Causes analysis of right branch shrinkage of Fenghuangzhou in Guichi Section of lower reaches of Yangtze River

作　　者：江磊 王罗斌 曾子悦 叶小云 JIANG Lei;WANG Luobin;ZENG Ziyue;YE Xiaoyun(Changjiang Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430010,China;Water Resources Departm)

机构地区：[1]长江勘测规划设计研究有限责任公司,湖北武汉430010 [2]长江科学院水资源综合利用研究所,湖北武汉430010

出　　处：《水利水电快报》2025年第1期56-60,共5页Express Water Resources & Hydropower Information

基　　金：国家重点研发计划项目(2023YFC3209503)。

摘　　要：贵池河段位于长江干流下游,近年来凤凰洲右汊持续萎缩,对河势稳定及沿岸经济社会发展造成了不利影响,但目前右汊萎缩的原因尚不清楚,厘清右汊萎缩的原因对河段后续开展治理具有重要意义。基于贵池河段1970~2021年的实测地形资料和水沙资料,对贵池河段凤凰洲右汊的演变和萎缩原因进行了分析。结果表明:凤凰洲右汊自20世纪70年代开始萎缩,经历了快速萎缩(1974~2003年)和缓慢萎缩(2003~2021年)两个阶段,目前枯季分流比仅2.0%。右汊的快速萎缩主要与上游河势变化导致的主流坐弯、汊道进口远离主流区有关;缓慢萎缩则主要与目前两汊动力条件的差异有关,左汊冲刷动力远大于右汊。The Guichi Section is located in the lower reaches of the main stream of Yangtze River.In recent years,the right branch of the Fenghuangzhou has been continuously shrinking,which has had a significantly adverse impact on the stability of the river regime and the economic and social development along the river.However,the reason for the shrinkage of the right branch is still unclear at present.Figuring out the reason for the shrinkage of the right branch is of great significance for the subsequent governance.Based on the measured topographic data and flow and sediment data of the Guichi Section from 1970 to 2021,an analysis was conducted on the evolution and the reasons for the shrinkage of the right branch of the Fenghuangzhou in the Guichi Section.The results showed that the right branch began to shrink in the 1970s and had gone through the rapid shrinkage stage(from 1974 to 2003)and the slow shrinkage stage(from 2003 to 2021)two stages.At present,the diversion ratio in the dry season was only 2.0%.The main reason for the rapid shrinkage of the right branch was related to the mainstream turning around due to the changes in the upstream river regime and the inlet of the branch being far away from the mainstream area.The main reason for the slow shrinkage was related to the differences in the hydrodynamic conditions of the two branches at present,and the scouring dynamics of the left branch was much greater than that of the right branch.

关 键 词：河道演变 汊道分流比 水动力条件 贵池河段 

分 类 号：TV877[水利工程—水利水电工程]