金沙江流域降水特征分析

Analysis of precipitation characteristics of Jinsha River Basin

为了分析金沙江流域的降水特征,采用金沙江流域17个代表站的逐日降水量资料,对其多年降水量的时间分布、空间分布、多年时段特征和多年1,35,7,d连续最大降水量等进行了初步分析。结果表明:金沙江流域降水量年际变化不大,但年内分配极不均匀,雨季降水量大而集中,约占全年总量的90%;旱季降水量少而不稳定,约占全年总量的10%;年降水量分布呈东西两边小、中间大,左岸大于右岸的特点;攀枝花以下地区日平均降水量大于以上地区;雨季日平均降雨量呈东北向西南减少的趋势。

In order to analyze precipitation characteristics of Jinsha River Basin,we conduct precipitation analysis including time distribution,spatial distribution,annual period features and multi-year 1,3,5,7 d maximum continuous precipitation by adopting the daily precipitation data of 17 representative hydrological stations in Jinsha River Basin.The results show that the annual variation of rainfall is small,but the monthly-distribution is severely uneven,which is mainly in rainy season,accounting for 90% of annual total;in dry season,precipitation is small and unstable,accounting for 10% of annual total;annual rainfall distribution is characterized by larger in east and west areas of the basin and smaller in middle area,larger on left bank and smaller in right bank;the daily average precipitation in downstream area of Panzhihua is larger than that in upstream area;the daily average precipitation in rainy season decreases from northeast to southwest.