三峡水库蓄水后长江江湖汇流段河道演变分析

Analysis on the River Channel Evolution of the Convergence of the Yangtze River after the Impoundment of the Three Gorges Reservoir

三峡工程是长江干流重要的控制性工程,自水库蓄水运行以来对下游河段的河势产生一定的影响。本文根据实测水文河道资料,分析了江湖汇流河段三峡水库运行前后的水文特性变化以及河段河势的变化情况,从而推知,三峡工程运行后,江湖汇流段上游来水量变化不大,来沙量大幅度减小;河势总体稳定,目前仍表现为冲淤交替,未出现单向性累积冲刷现象。

The Three Gorges Project is the dominant reservoir over the Yangtze River, which has been affecting the natural evolution of the downstream riverbed. The evolution of the riverbed in the Dongting Lake joint reach of the Yangtze River is analysed based on the observed data of hy- drology and underwater topogrophy. It is inferred that after the operation of the Three Gorges Project there is no much change of the amount of water from the upper reach and sediment trans- ported is much less. The riverbed of the reach is generally kept stable with alternatel scour and deposition.