长江下游江心洲—乌江长河段河床演变宏观分析研究

Macro analysis on alluvial process from Jiangxinzhou to Wujiang Reach in Yangtze River downstream

以现场调研和多年实测资料为基础,采用理论分析的方法,对长江下游典型长河段江心洲—乌江河段水流和泥沙特征、河床演变宏观规律进行了分析,并对影响洲滩演变的主要因素进行总结、归纳。分析结果表明:长江下游江心洲—乌江长河段的河床演变是江心洲河段主流摆动的联动效应,各水道河床演变相互关联,相互影响,而该河段进口主流的摆动是引起河段内几个水道河床演变主要原因之一。

Based on site investigation and annual survey data,the theoretical analysis methods were used to analyze the characteristic of water flow and sediment,the macro law of riverbed evolution of the reach from Jiangxinzhou to Wujiang in the Yangtze River downstream. And the major factors influencing on the sandbar and beach evolution were summarized. The analysis results demonstrate that the riverbed evolution of the reach from Jiangxinzhou to Wujiang is caused by the linkage effects of main current swings in Jiangxinzhou Reach. The riverbed evolution of waterways are interrelated and influenced each other,and the main current swings in the inlet reach is one of the main reason for causing the riverbed evolution of each waterway in the reach from Jiangxinzhou to Wujiang.