基于SWMM模型的西安地铁停车场海绵城市建设效果模拟

Simulation of Construction Effect of Sponge City in Xi'an Subway Parking Lot Based on SWMM Model

通过海绵城市建设缓解西北地区地铁停车场雨水利用不充分问题,实现地铁停车场园区雨水的渗透和净化,促进雨水资源回收利用。以西安市鱼化寨地铁停车场为研究对象,基于暴雨洪水管理软件SWMM构建模型,模拟分析海绵城市理念下利用LID设施进行改造与传统模式开发条件下雨水径流变化以及污染物负荷控制效果。结果表明对比改造之前,海绵城市建设可以有效降低地铁停车场区域雨水径流量,不同重现期下的削减率分别为58.99%、58.84%、58.07%、56.93%;改造后的污染物排放浓度均被有效削弱,污染物排放的峰值被削减并延后,有效降低该区域水体的污染负荷。

The construction of sponge city alleviates the problem of insufficient rainwater utilization in subway parking lots in the northwest region.It realizes the penetration and purification of rainwater in subway parking lot parks,and promotes the recycling and utilization of rainwater resources.Taking Xi’an Yuhuazhai subway parking lot as the research object,combined with the storm flood management software SWMM to build a model.This paper simulates and analyzes the change of rainwater runoff and the effect of pollutant load control under the conditions of the transformation of LID facilities under the concept of sponge city and the development of traditional models.The results show that before the comparison and reconstruction,the construction of sponge city can effectively reduce the rainwater runoff in the subway parking lot area.The reduction rates under different return periods are 58.99%,58.84%,58.07%,and 56.93%,respectively.After the transformation,the pollutant discharge concentration was effectively weakened,and the peak pollutant discharge was reduced and postponed,effectively reducing the pollution load of the water body in the area.