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设计暴雨量是城市勘查设计重要标准之一.根据年最大值法与年多个样法选取的重庆市主城区沙坪坝站1961-2013年60,120,180,360,540,720,1 440min历时资料,采用皮尔逊Ⅲ型分布、耿贝尔分布、指数分布、对数正态分布、广义帕雷托(GP)分布函数对其进行拟合,并对拟合效果进行检验,结果表明:GP分布函数的拟合效果最好,可信度更高.重庆主城区推荐使用GP分布函数拟合的设计暴雨量.当所需设计暴雨量的各历时及其资料年限与暴雨强度公式编制时使用的相同时,可用暴雨强度公式计算设计暴雨量,否则会有误差.
The design of heavy rainfall is one of the most important criteria in urban survey and design.According to the annual maximum value method and year sample method, the data of Shapingba station in the main urban area of Chongqing from 1961 to 2013 are analyzed at 60,120,180,360,540,720,140min. The Pearson Ⅲ distribution, Bell distribution, exponential distribution, lognormal distribution and generalized Pareto (GP) distribution function, and test the fitting results. The results show that the fitting effect of GP distribution function is the best and credible The higher the main city of Chongqing recommended the use of GP distribution function to fit the design of heavy rainfall.When the required design rainfall duration and data age and storm intensity formula used in the preparation of the same storm intensity formula can be used to calculate the design of heavy rain Amount, otherwise there will be errors.