镇江市新一代暴雨强度公式研制及雨型设计

用镇江市1980—2013年连续34 a的降水观测资料,通过数据审核处理建立暴雨统计样本。对镇江市近34 a的暴雨特征进行统计分析,发现其存在较为显著的阶段性变化特征,具备开展新一代暴雨强度公式研制的必要。基于此,采用年最大值法展开修订,基于皮尔逊III型分布确定概率曲线并进行参数推求,研制了镇江市新一代暴雨强度公式。在此基础上,开展镇江市短历时暴雨雨型设计研究。统计发现:短历时暴雨以单峰型分布为主,其雨峰位置大部分出现在整个暴雨过程的前半段。进而采用芝加哥法雨型进行雨型设计,确定雨峰位置系数,得到镇江市短历时暴雨的雨型设计过程,短历时暴雨的瞬时雨强最高达5.9 mm/min,过程累计降水最高达105 mm。

Research on new generation rainstorm intensity formula and design of rainfall hyetograph in Zhenjiang

Based on the precipitation data from 1980 to 2013 in Zhenjiang, the reliable rainstorm statistics sample was collected through audits of data quality. The statistical analysis on the rainstorm characteristics of Zhenjiang over recent decades found that the rainstorm obvious variation characteristics in phase exists, which is necessary to conduct the new generation rainstorm intensity formula research. The revision of rainstorm intensity formula in Zhenjiang was carried out by the annual maximum value method, the probability curves were followed by Pearson-III distribution, the formula parameters were calculated, so the new rainstorm intensity formula of Zhenjiang has been deducted. On this basis, the statistical analysis on rainfall hyetograph found that the short duration rainstorm presents unimodal distribution and the peak position appears in the first half rainstorm process. Moreover, the peak position coefficient was calculated and the rainfall hyetograph of short duration storm was designed by the Chicago hyetograph. The results showed that the maximum instantaneous rainstorm intensity can reach 5.9 mm/min and the maximum accumulated rainfall can reach 105 mm.