暴雨管理模型(SWMM)在城市排水系统雨季溢流问题中的应用

Solution to the Problem on Urban Drainage System Overflow in Rainy Season with Storm Water Management Model(SWMM)

该文应用暴雨管理模型(SWMM)对北方某城市小区的合流制排水管网系统进行仿真,模拟重现期为一年的暴雨状况下排水管道和节点在不同时段的工作状态,利用SWMM的模拟结果找出主要的溢流瓶颈点位置,并对造成溢流的可能原因包括地面不透水面积所占比例、管径、管道粗糙度以及管道坡度进行了比较和量化分析,得出造成溢流的最主要原因是下游管道的管径过小以及地面不透水面积所占比例过大,据此结果对管网进行了优化,并对优化后的管道在雨季的工作状况进行了二次模拟。该文的研究方法和研究结果可为新建、改建和扩建城市排水管网提供科学参考和依据,从而帮助减少暴雨给城市带来的涝灾损失。

Storm water management model （SWMM） was applied on a combined drainage system of an urban district in northern China. The water flow status in the drainage pipes and nodes during a simuXated storm event with one-year return period was analyzed. Based on the simulation results, the critical overflow bottle-neck point was identified. Then the possible reasons for overflow including percentage of impervious area, pipe diameter, pipe roughness and pipe slope were quantitatively analyzed and compared. The results showed that the main reason for overflow was that the diameter of downstream pipes was too small. The percentage of im- pervious area was the next important reason. The drainage network was optimized based on these analyses. The methods and resuhs of this study are valuable for design, rebuilt and modification of urban drainage network. These results help to reduce the economic losses caused by the drainage overflow in urban area.