三峡水库蓄水后大通至江阴河段河床冲淤变化分析

Analysis of riverbed scouring and silting in Datong Jiangyin reach after the impoundment of the Three Gorges Reservoir

在长江上游及中下游其他水系大型控制性水利枢纽建设和运行的综合影响下,进入长江下游的水沙条件显著变化,从而引起下游大通至江阴河段河床的冲淤调整。2001—2021年,大通至江阴河段河床趋势性的普遍冲刷较为明显,进而给沿江涉水工程的运行带来一定影响。以大通至江阴河段的水文、泥沙、固定断面及水下地形等观测数据为依据,对大通至江阴河段的水沙条件、河床冲淤量开展分析计算。

Under the comprehensive influence of the construction and operation of large-scale control water conservancy projects in the upper and middle Yangtze River,the water and sediment conditions entering the lower reaches of the Yangtze River have changed significantly,causing the scouring and silting adjustment of the riverbed of the downstream reach from Datong to Jiangyin.From 2001 to 2021,the trend of general erosion of the riverbed from Datong to Jiangyin is more obvious,which has a certain impact on the operation of wading projects along the river.Based on the observation data of hydrology,sediment,fixed cross-section and underwater topography of the Datong Jiangyin river section,the water and sediment conditions and the amount of riverbed scouring and siltation of the Datong Jiangyin river section are analyzed and calculated.