城市暴雨强度公式修订对城市排水系统影响研究

Study on the Impact of Urban Rainstorm Intensity Formula Revision on Urban Drainage System

摘要: 在全球气候变化与快速城镇化的背景下，城市短历时暴雨特征已发生变化。暴雨强度公式是城市排水系统规划、设计的重要依据，因此暴雨强度公式应能够客观反映城市降雨特征与规律。深圳市和成都市于2015年完成了暴雨强度公式的修订，修订前后暴雨强度公式的形式保持不变，但暴雨强度公式相应参数发生了显著的变化，基于修订前后的暴雨强度公式计算了两个城市不同重现期暴雨强度值，发现不同重现期下修订后暴雨强度公式计算的暴雨强度值相较于原公式存在偏小和随降雨历时从偏大到偏小的动态变化，这种因暴雨强度公式修订产生的暴雨强度差异将对城市已建排水系统带来显著影响。

Abstract: Against the background of global climate change and rapid urbanization, the characteristics of short-term urban rainstorms have changed. The storm intensity formula is an important basis for the planning and design of urban drainage system, so the rainstorm intensity formula should be able to objectively reflect the characteristics and laws of urban rainfall. Shenzhen and Chengdu completed the revision of the storm intensity formula in 2015, and the form of the storm intensity formula remained unchanged before and after the revision, but the corresponding parameters of the rainstorm intensity formula changed significantly, and the storm intensity values of the two cities during the different re-enactment periods were calculated based on the rainstorm intensity formula before and after the revision. It was found that the value of rainstorm intensity calculated by the revised rainstorm intensity formula under different re-enactment periods was smaller than that of the original formula and changed dynamically from large to small with the rainfall duration, and the difference in storm intensity due to the revision of the storm intensity formula will have a significant impact on the urban built drainage system.