洮河流域降水特性及其趋势分析

Precipitation Characteristics and Trend Analysis in Tao River Basin

在引用洮河流域岷县、李家村和红旗等3个水文站1970—2008年月降水量资料的基础上,运用距平分析法、5 a平均滑动法及降水量变化倾向率统计分析法,对该流域的降水变化特性及其趋势进行了分析,结果表明,洮河流域的降水在时空和地域上存在不均匀性,年降水量300～550 mm,主要集中在夏秋两季,占全年降水量的95%。年降水量上游大于下游,3个水文站的年降水量呈递减趋势,尤以李家村水文站的递减趋势最明显。

In this note for measured monthly precipitation data of three hydrological stations of Minxian, Lijia and Hongqi village in the Tao River watershed from 1970 to 2008, using anomaly analysis method, the five-years average sliding law method and statistical analysis method of precipitation changes tendency rate, the characteristics and trends of precipitation changes of the watershed were analyzed. The results showed that the precipitation of the Tao River basin on spatial and temporal and geographical heterogeneity was inhomogeneous greatly, annual precipitation was between 300 - 550 mm, mainly concentrated in the summer and fall, the two quarters of precipitation about 95% of the anmtal precipitation amount. The annual precipitation of Tao River basin upstream is greater than downstream, three representatives of annual precipitation showed a decreasing trend, especially the Li Jiacun representative stations in a decreasing trend is most obvious.