城市设计暴雨频率曲线线型的研究

城市排水规划需有一定设计标准的暴雨值,这类设计暴雨的特点是历时短、设计标准不高和统计分布呈反S形。提出了用两端有限对数正态分布和广义指数分布作为频率曲线线型进行计算,可避免用Γ分布适线欠佳的缺点。通过实例,发现采用这两类分布,计算简便,能获得适线较好的结果。

Study on Frequency Curve Type of Urban Design Storm

It is necessary to get the certain standard of design storm values for urban drainage planning.The specialty of urban design storm is that the statistical distribution has an anti-S shape,the design standard is lower and the duration is short.The frequency computation by two-end limited lognormal distribution and generalized exponential distribution as the type of frequency curve is presented in the paper.Through the practical example,it is found that the computation is convenient and the good curve-fitting results will be reached by these two distributions.