金沙江流域径流特征及变化趋势分析

采用金沙江干流上、中、下游各主要水文站多年径流系列资料,分析计算了各站径流的极值比、变差系数、径流年内分配不均匀系数、集中度和集中期等反映径流年际年内变化情况的特征值。同时应用Mann-Kendall法分析检验了金沙江流域的径流长期变化趋势。研究成果表明,金沙江流域径流量的年际变化不大,上游较中下游的变化稍大,径流年内分配十分不均,上游较之中下游更不均匀;自20世纪50年代以来,在置信水平值为0.05时,金沙江干流各主要水文站的年径流系列检验值均没有突破临界值,这表明年径流系列没有显著的上升或下降趋势。

Runoff characteristics and variation tendency of Jinsha River Basin

By the series data of pluriennial annual runoff of the hydrological stations at upstream,middle stream and downstream on the main stem of Jinsha River,the characteristic values reflecting annual and interannual variations of runoff,such as runoff extremum ratio of the stations,variation coefficient,inter-annual unevenly distribution coefficient of runoff,concentrative degree,concentrative period etc.,are analyzed,and the long-term variation tendency of the runoff in the Jinsha River Basin is analyzed and ch...