三峡水库蓄水前后长江上游近期水沙变化趋势

Near term water flow and silt concentration variation trend of Yangtze River before and after impounding of Three Gorges Reservoir

受多种因素影响,近年来长江上游来沙量明显减少,这将对三峡水库的效益产生影响。本文首先用实测年径流量和年输沙量双累积曲线统计分析法及Spearman秩次相关检验分析了三峡上游来水来沙减少的事实,并统计得到了近期来水来沙量的相关关系,该关系可用于预测近期三峡水库的入库年沙量。然后研究了上游大中小水库群拦沙淤积对减沙的影响系数,α相关分析结果表明α与水库下游沿程距离L呈指数函数关系。

Affected by a number of factors,the silt load transported from the upper reaches of the Yangtze river reduces quite significantly during last few years which will have important impact on the benefits of the Three Gorges reservoir.This paper studies and analyses the facts of decreased water inflow and silt load into Three Gorges reservoir based on dual accumulation curves of measured annual water runoff and annual sediment transport,with the use of the statistical analysis method and Spearman rank order cor...