福建省城市短历时暴雨频率分布假设检验

Frequency distribution statistical test of urban short-duration rainstorm in Fujian Province

根据福建省65座城市实测短历时暴雨资料,采用假设检验方法,对皮尔逊Ⅲ型分布、耿贝尔分布和指数分布进行检验.研究结果表明,福建省城市短历时暴雨符合耿贝尔分布,且频率分布与暴雨历时长短无关,也不存在地区性区别,可采用耿贝尔分布作为福建省城市短历时暴雨频率分布型式.

Whether the observed data of urban short - duration rainstorm from 65 observatories in Fujian Province fit the Pearson Type m distribution, Gumbel distribution or exponential distribution is checked with statistical test method in this paper. The research results show that the observatory number which passing statistical significance test of Gumbel distribution is a little more than that of Pearson Type Ⅲ distribution, and no one has passed the test about the exponential distribution. Meanwhile, the frequency distribution has no relation to regional differentials and duration of storm. Thus, it is suggested that the Gumbel distribution would be the frequency distribution type of urban short - duration rainstorm in Fujian Province.