基于SWMM的低影响开发城市道路雨洪控制模拟研究——以萍乡市武功山大道为例

Simulation Study of Flood Control for City Road with Low Impact Development Based on SWMM: Taking Wugong Mountain Avenue in Pingxiang as an Example

低影响开发设施作为能够有效消减、利用和延缓城市道路雨水径流以及控制径流污染的分散性单元,正逐渐应用于道路排水系统建设中。该文以海绵城市试点--江西省萍乡市武功山大道为研究对象,运用雨洪管理模型(SWMM)模拟不同重现期(一年一遇、三年一遇、五年一遇以及十年一遇)3小时降雨下生物滞留设施、透水铺装等单一低影响开发设施以及低影响开发组合模式对于道路雨水径流削减效果。结果表明,采用LID雨水系统的城市道路在不同重现期下对径流总量的削减率为34.5%、28.2%、26.1%、24.3%,径流峰值削减率分别为37.4%、27.3%、23.5%、19.5%。同时,对于单项LID设施而言,生物滞留设施在径流总量以及峰值削减上均优于渗透铺装,具有良好的雨洪调控效果。

As a dispersive unit which can effectively reduce,utilize and delay the runoff and control the runoff pollution,low impact development facilities are gradually applied to the construction of road drainage system.Taking Wugongshan Avenue in Pingxiang City of Jiangxi Province as the research object,we simulate single low impact development(LID)facilities such as biological detention facilities,permeable pavement and the effect of combination mode on runoff reduction of municipal roads under three-hour rainfall with different recurrence periods(once in every year,once in every three years,once in every five years,once in every 10 years).The results show that the reduction rates of peak runoff were 37.4%,27.3%,23.5%and 19.5%,respectively.At the same time,for the single LID facility,the biological detention facility is superior to the infiltration pavement in the total runoff volume and peak reduction,and has a good effect on rainwater regulation.