摘要
许多工程的设计需依据给定重现期的降水极值,概率推算是其中一种重要的方法.Pearson-Ⅲ型曲线常用于拟合降水频数分布,该文简要介绍了用Pearson-Ⅲ型概率分布推算重现期年最大日雨量的基本方法.采用漳州市10个测站1961～2003年最大日雨量资料,计算给定重现期的最大日雨量.运用常见的办公软件Excel 2000的函数计算功能,构造Pearson-Ⅲ概率分布函数公式,实现软件的快捷计算.初步结果为:在全市10个站的拟合中,有7个站拟合效果较好,3个站拟合效果较差.文中就提高Pearson-Ⅲ概率分布计算精度方面进行了讨论.
The method for estimating the annual maximum diurnal precipitation in various reappearance periods with Pearson-Ⅲ distribution is described. The maximum diurnal precipitation for reappearance periods was calculated by using the maximum diurnal precipitation data from 10 stations in Zhangzhou from 1961 to 2003. The calculation was performed on Microsoft＇s Excel 2000. The results show that the fitting results are satisfactory in 7 out of 10 weather stations, and those for the other three stations are poor. The calculation precision of Pearson- Ⅲ distribution is discussed.
出处
《气象科技》
2005年第4期314-317,共4页
Meteorological Science and Technology
