三峡水库修建后长江中游城陵矶至九江河道冲淤变化研究

长江中游城陵矶至九江河段为典型分汊河道,分析该河段在三峡工程蓄水后的冲淤变化,对预测该河段河床演变发展有重要意义。根据2003~2016年城陵矶-九江河段实测水文地形等原型观测资料及冲淤量计算成果,对河道冲淤量、冲淤强度、河床冲淤分布和冲刷形态变化等方面从沿时和沿程上进行全面分析,发现河段整体呈持续冲刷态势,近年来冲刷强度显著增强,冲刷主要部位在枯水河槽,冲刷形式以深泓纵向下切为主,沿程以西塞山为界,上段整体表现为"槽冲滩淤",下段表现为"滩槽均冲"。

Research on Erosion and Deposition Change of Chenglingji to Jiujiang Section in Middle Changjiang Mainstream after Impoundment of Three Gorges Reservoir

Chenglingji to jiujiang section in the middle reaches of the Changjiang river is a typical branching channel. The analysis of erosion and deposition change of Chenglingji to Jiujiang section has important significance for prediction of riverbed evolution. Based on the prototype observation data of Chenglingji-Jiujiang river section from 2003 to 2016 and the calculation results of the erosion and deposition amount, this paper analyzed the amount, the intensity, the distribution and the form of the eroding and depositing both along the time and along the river. It discovered that the reach is in a station of erosion on the whole, and the erosion intensity has increased significantly in recent years; The erosion is mainly concentrated in the low flow channel; The water flow eroded the bed mainly in the form of vertical incised deep. As Xisan Moutian was a boundary point, the upstream is with the features of significant groove erosion and shoal deposition, and the downstream is eroded both in groove and shoal.