贵阳市暴雨强度公式推求

Study of Rainstorm Intensity Formula in Guiyang City

利用贵阳国家基准气候站1961-2014年逐分钟降水资料,选取并计算5、10、15、20、30、45、60、90、120、150、180 min共11个时段逐年最大降雨量样本,依据《室外排水设计规范》（GB50014-2006,2014版）和《城市暴雨强度公式编制和设计暴雨雨型确定技术导则》（2014版）技术要求,对贵阳暴雨强度公式进行推求,得到以下结论：三种频率分布曲线拟合结果表明耿贝尔分布曲线优于皮尔逊Ⅲ型和指数分布;在形式上分别给出了贵阳市暴雨强度总公式、单一重现期暴雨强度公式和区间（任意重现期）暴雨强度公式;计算贵阳市暴雨强度区间公式和总公式重现期2-20 a暴雨强度平均绝对均方误差及平均相对均方误差,结果均满足《室外排水设计规范》（GB50014-3006,2014版）提出的精度要求,但区间公式精度明显优于总公式,因此在实际应用中推荐使用贵阳市暴雨强度区间公式。

The maximum rainfall sample in 11 time frames of 5,0,15,20,30,45,60,90,120,150 and 180 min is selected and calculated year by year by 1961 ~ 2014 rainfall data minute by minute of Guiyang National Benchmark Climate Station.Based on the technical requirements of Outdoor Drainage Design Standard(GB50014-2006,2014 Edition) and Urban Rainstorm Intensity Formula and Design Rainstorm Pattern Determining Technical Guideline(2014 Edition),the rainstorm intensity formula in Guiyang City is studied.The conclusion is that three frequent distribution curves fitting the result show that Cubei Distribution Curve is more excellent than Pearson-Ⅲ and exponent distribution.The general formula of rainstorm intensity in Guiyang City,the rainstorm intensity formula for single recurrence period and the rainstorm intensity formula for interval(arbitrary recurrence period) are given in the form.The Mean absolute mean square error and the Mean relative mean square error in 2~20 a rainstorm intensity of recurrence periods of the rainstorm intensity interval formula and the general formula in Guiyang City are calculated.The results can all satisfy the accuracy requirements put forward in Outdoor Drainage Design Standard(GB50014-2006,2014 Edition).But the accuracy of the interval formula is obviously better than the general formula.Therefore,the rainstorm intensity interval formula of Guiyang City is recommended for the practical application.