三峡水库运用前后进出库水沙变化分析

 根据三峡水库蓄水前后实测水沙资料，对三峡水库近期进出库水沙变化进行了较为系统的分析。结果表明：上世纪 90 年代以来，三峡水库进出库水沙均有所减小，其中输沙量减小更为明显；蓄水运用后三峡水库汛期进出库水量、沙量占全年的比例仍分别维持在 76% 以上和 96% 以上，但从年内分配变化上看，汛期进库水、沙量占全年的比例均呈减少趋势，汛期出库水量比例呈减少趋势，出库沙量比例呈增大趋势；三峡水库蓄水运用后 9-10 月份进出库水沙量减小较多，而枯水期 2-4 月份进出库流量均呈增大趋势。

Changes of Inflow and Outflow Runoff and Sediment of Three Gorges Reservoir Before and After the Impoundment

The changes of inflow and outflow runoff and sediment of the Three Gorges Reservoir before and after the impoundment are systematically analyzed based on the observed data of hydrographic stations.The results reveal that since the 1990s,the inflow-outflow runoff and sediment have both reduced,of which the sediment discharge reduced much more remarkably than the runoff.In recent years,the inflow-outflow runoff and sediment during flood season remain above 76% and 96% of the whole year.In terms of annual dist...