排水管网的公式法设计与模型模拟效果分析

Formula Method Design of Drainage Pipe Network and Analysis of Model Simulation

为对比分析小面积排水管网公式法与数学模型模拟效果之间的差异,分别采用传统推理公式法和SWMM模型结合芝加哥降雨过程线对一小汇水面积片区的排水管网系统进行设计和模拟计算,对比分析了两者管道流量、节点水深的差异及峰值排水过程。结果表明,两者管道流量峰值相近,模拟的最大节点水深略高于公式法设计值,可见对小汇水面积而言,按公式法设计的管网系统能满足相应重现期的排水过程要求。

This article utilizes the conventional rational formula method to design the drainage system of small catchment area.The analog computation and verification for the system is carried out by using storm water management model（SWMM）combined with the curve of Chicago precipitation process.Through analyzing the differences between pipe flow and water level of the node as well as the drainage process in the state of peak value,it draws the conclusion that for the small catchment area,the analog value basically is consistent with the design value,and the simulation of water depth of the node is larger than that of formula method.Therefore,the formula method design of the drainage networks can meet the demands of drainage process during return period.