基于暴雨雨型的设计径流量研究及应用

Study on Design Runoff Volume Based on Rainstorm Pattern and Its Application

为简化排水模型在城市排水防涝规划中的应用,利用武汉短历时暴雨雨型,采用三角概化法推导出雨型径流量计算公式。通过武汉雨型径流量设计程序在9个排水区的应用,在相同重现期标准下与武汉暴雨强度公式进行对比,同频率雨型设计径流量的平均绝对值相对误差为1.29%,最大误差<5%。采用相关因子拟合公式计算排水区节点雨水汇流时间,可建立雨型径流量节点管控简化模型,无需排水管网建模,可实现城市排水防涝规划水位管控,也可进行雨水溢流污染控制调节池容量的计算。

In order to simplify the application of drainage models in urban drainage and waterlogging prevention planning,the rainstorm pattern runoff calculating formula was deduced by the triangle generalization method based on short-duration rainstorm pattern in Wuhan City.Through the application of Wuhan rainstorm pattern runoff design program in nine drainage areas,the relative error of the average absolute value of rainstorm pattern design runoff was 1.29%and the maximum error was less than 5%,compared with Wuhan rainstorm intensity formula under the same return period standard.The simplified model of node control of rainstorm pattern runoff could be established by calculating the rainwater confluence time in drainage area with the correlation factor fitting formula.Without the need of drainage network modeling,water level control of urban drainage and waterlogging prevention planning could be realized,and the capacity of the combined sewer overflow(CSO)pollution control regulating tank could be calculated.