用Pearson-Ⅲ型概率分布推算贵阳降水量的重现期

To reckon the recurrence interval of precipitation in Guiyang with Pearson-Ⅲ-probability distribution

Pearson—III型概率分布曲线能用来拟合不同时段降水量的分布,进而求得一定重现期下的降水量极值,该文采用该方法分别对贵阳市年雨量、年最大月和日降水量3种变量进行拟合。结果表明,Pearson—III型概率分布能较好拟合贵阳地区的暴雨频数分布,拟合效果良好,估算结果可信。

The yearly rainfall, annual maximum monthly rainfall and daily rainfall of Guiyang city are fit by Pearson-Ⅲ probability distribution, and the corresponding extreme values for different return periods were compu- ted. The results show that, Pearson-Ⅲ probability distribution fit quite well for the precipitation in various reappear- ance periods, and the estimation of extreme values were reasonable and reliable.