近51年西柳沟流域水沙变化特征分析

Variation characteristics of runoff and sediment in Xiliugou River basin for recent 51 years

选取1960-2010年西柳沟流域降水、径流与输沙资料,采用滑动平均法、Mann-Kendall趋势分析及突变检验法、滑动t检验方法及距平法等方法,分析了西柳沟流域近51年水沙的变化趋势和突变。趋势分析表明,降水量年际变化呈缓慢的上升趋势,径流量与输沙量年际变化呈显著下降趋势。突变分析表明,降水量序列没有出现突变,径流量与输沙量序列在下降过程中出现突变,但突变年份不一致,径流量发生在2004年,输沙量发生在2000年。

According to the precipitation,runoff and sediment data of Xiliugou river basin from 1960 to 2010,the trends and the abrupt variations of the precipitation,runoff and sediment were analyzed with the methods of sliding average,Mann-Kendall,sliding-t detecting and anomaly.The trends results show that the precipitation had been slowly increasing,the runoff and sediment had been strongly decreasing.The abrupt variations results show that the observed site of precipitation did not abruptly change,that of the runoff and sediment abruptly changed in their falling process and the abrupt change years of runoff and sediment were different,that of the runoff was in 2004 and the sediment was in 2000.