基于SWMM的市政管网清淤方案优化研究

Research on optimization of municipal pipe network dredging plan based on SWMM

城市管网系统常会出现淤堵致使管网排水能力降低,且管网清淤工作难度高,效率低。为此,采用SWMM模拟技术提出一套快速恢复管网排水能力的清淤方案,分析清淤前工况的管网溢流节点位置确定重点清淤管道,通过清理重点清淤管道快速恢复管网排水能力。以陕西省沣西新城天福和园小区的管网系统为例,按照全局管网淤积系数(GSC)将清淤前工况划分为7种情况;在不同设计降雨条件下分别进行模拟,并对管网排口流量过程和管网总溢流量进行统计分析,该管网系统共有31根排水管道,通过模拟分析确定了11根重点清淤管道,建立清淤后工况模型。模拟结果显示:清淤后,7种情况的管网排口流量过程线恢复至与无淤积工况几乎完全重合;管网总溢流量较清淤前工况大大降低,降低百分比最小的情况也达到91.2%。

The urban pipe network system is often blocked,which reduces the drainage capacity of the pipe network,and the dredging of the pipe network is difficult and inefficient.For this reason,this article uses SWMM simulation technology to propose a set of dredging plans for quickly restoring the drainage capacity of the pipeline network,analyzes the location of the overflow node of the pipeline network before dredging,and determines the key dredging pipelines,and quickly restores them by cleaning the key dredging pipelines Drainage capacity of pipe network.Taking the pipe network system of Tianfuheyuan Community in Fengxi New City,Shanxi Province as an example,according to the global siltation coefficient(GSC),the working conditions before dredging are divided into 7 situations;simulations are performed under different design rainfall conditions,and statistical analysis was performed on the discharge flow process of the pipe network and the total overflow flow of the pipe network.The pipe network system had 31 drainage pipes.Through simulation analysis,11 key dredging pipelines were determined,and the working condition model after dredging was established.The simulation results show that after dredging,the discharge flow process line of the pipe network under 7 conditions is restored to almost completely coincide with the non-silting condition;the total overflow of the pipe network is greatly reduced compared with the condition before dredging,and the reduction percentage is also the smallest reached 91.2%.