港口湾水库对水阳江上下游泥沙输移的影响

Impact of Gangkouwan Reservoir on Upstream and Downstream of Sediment Transport

以水阳江干流宣城水文站、支流胡乐司水文站1974~2010年逐日输沙量和含沙量资料为基础,分析了港口湾水库建立前后对水阳江上下游泥沙输移影响的变化过程,采用M-K趋势法检验了建库前后的输沙量和含沙量,选取年内分配变差系数、年内分配不均匀系数、完全调节系数、集中度、FI指数5个指标分析了输沙量年内分配规律及不同时段的含沙量与输沙量。结果表明,港口湾水库对水阳江上下游泥沙输移影响显著,两站输沙量和含沙量减幅大,变化趋势明显,不同时间尺度下建库前后的泥沙输移均发生了不同程度的改变。总体上看,年内分配变化更大、集中度更小。

Based on the data of daily sediment load and sediment concentration from 1974 to 2010 at Xuancheng station on the mainstream of Shuiyangjiang River and Hulesi station on the tributary, the impact of upstream and downstream sediment transport change process before and after the construction of Gangkouwan Reservoir are analyzed. The trend of sediment load and concentration are analyzed by M-K test method. And then the variation coefficient, uniformity coefficient, full regulation coefficient, concentration degree and F1-index are used to analyze the annual sediment distribution law and the sediment load and concentration at different time scales. The results show that the construction of Gangkouwan Reservoir has significant impact on the upstream and downstream of sediment transport, which both stations＇ sediment load and concentration decrease greatly, the variation trend is obvious, the sediment transport has different degrees of change in different time scales. Overall, the annual distribution is greater degree of change and smaller concentration.