长江三峡水库建库以来来水变化及原因分析

On the Inflow Change of the Three Gorges Reservoir since its Completion

对三峡水库建成以来,长江上游流域水文径流特性发生的巨大变化进行了分析,结果表明,三峡水库年来水量呈现减少趋势,年内分配整体呈现平均化趋势。分析其原因,主要受年降水量减少、上游流域陆续新建大批水利工程、上游流域水库群调蓄的影响。

Since the completion of the Three ches of the Yangtze River have been changed Gorges Reservoir, the hydrological runoff characteristics of the upper rea- tremendously. Analysis shows that the annual inflow into the reservoir de- creases gradually, and the annual distribution shows an averaging trend. These changes could be caused by the decrea- sing of the annual precipitation, the construction of a large number of water conservancy projects in the upper reaches, and the storage and dispatching of the reservoir group in the upper reaches.