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1 暴雨统计参数的计算与调整表达点暴雨特性的统计参数包括均值H,变差系数Cv,偏态系数Cs和历年最大值。1.1 历年最大值的挑选某站各历时暴雨历年最大值在已建好的暴雨数据库中挑选,不分系列长短,有资料的站全参加了挑选。10分钟和60分钟暴雨在Cv等值线合理性检查时,考虑到一些区域站点过少,适当引用了一些调查资料和气象部门的资料。1.2 均值的计算均值的计算采用公式:(?)均值采用计算值,不作调整。1.3 变差系数Cv的计算均方差:(?)
Calculation and Adjustment of Rainstorm Statistical Parameters The statistical parameters of rainstorm characteristics include mean H, coefficient of variation Cv, coefficient of skewness Cs and the maximum value over the years. 1.1 The selection of the maximum value over the calendar year The duration of a rainstorm in a station The maximum value in the established stormstorm database is selected, regardless of the length of the series, the data station participated in the selection of all. During the 10-minute and 60-minute rainstorms, in the Cv contours rationality check, taking into consideration too few sites in some areas, some survey data and meteorological data are quoted as appropriate. 1.2 Calculation of averages The calculation of averages uses the formula: (?) The mean is calculated using no adjustment. 1.3 Coefficient of variation Cv mean square error: (?)