小浪底水库蓄水对库区及周边降水的影响

Influence of Xiaolangdi Reservoir Impoundment on the Precipitation in Reservoir Area and Surrounding

通过对小浪底水库蓄水前后10 a的库区及周边14个气象观测站降水资料对比分析发现:由于水域面积的扩大,水库水位的增高,蓄水后库区及周边50 km左右的范围内年降水量及暴雨日数有明显增加,其中库区10 a平均降水量增加率为16.9%,夏、秋两季降水增幅显著,库区内夏季平均暴雨日净增加率达62.5%。

Through the comparative analysis of the precipitation data before and after impoundment of the 14 meteorological stations in Xiaolangdi reservoir and circumjacent area, the result points out： because of the expansion of the reservoir water area and the increase of the reservoir water level, the annual precipitation and heavy rain days significantly increases about 50kin around and within the scope, the average increase rate of the 10 years is 16.9% , the precipitation increases significantly in summer and autumn, the increase rate of the summer heavy rain days is 62.5%.