基于SWMM的城市道路LID设施雨水调控效果研究——以武汉市工业路为例

Rainwater Regulation Effect of LID Facilities on Urban Roads Based on SWMM:A Case Study of Wuhan Industrial Road

该文分析了城市道路径流规律和适用的LID设施,以武汉市工业路为例构建SWMM模型,探讨不同降雨强度下的生态滞留设施、植草沟、透水路面以及组合模式下的城市道路LID设施雨水调控效果。结果表明:(1)各等级城市道路应采用不同的雨水调控策略,LID设施对城市道路雨水调控作用显著,可有效减少径流量、降低峰值流量、推迟雨峰时间;(2)采用LID组合设施模式的城市道路,在0.5年一遇到10年一遇降雨下,LID设施对城市道路雨水径流量的削减率为34.8%~44.2%,对峰值流量的削减率为66.0%~83.6%,雨峰时间稳定推迟15min。(3)各类LID设施的径流削减量和峰值削减量随着降雨强度增大而提高,削减率呈总体下降趋势。LID设施一般对中小雨情(二年一遇及以下)的城市道路雨水控制作用更明显。城市道路景观设计时应更重视透水铺装材料的应用,降低道路绿地的雨水调控负荷。

Based on the analysis of urban road runoff law and suitable LID facilities,the SWMM model of Wuhan Industrial Road is constructed to explore the effect of rainwater regulation of urban road LID facilities under different rainfall intensities such as ecological detention facilities,grass planting ditches,permeable pavement and combination modes.The results show that:(1)urban roads of different grades should adopt different strategies of rainwater regulation and control,and LID facilities play a significant role in regulating urban road rainwater,which can effectively reduce runoff,reduce peak flow and delay peak time.(2)Urban roads with LID combined facilities model,when they encounter rainfall that occurs once in 0.5 year to once in 10-year,LID facilities can effectively reduce runoff,reduce peak flow and delay peak time.The reduction rate of urban road runoff by facilities is 34.8%~44.2%,the reduction rate of peak runoff is 66.0%~83.6%,and the peak time of rain is stably delayed for 15 minutes.(3)The runoff reduction and peak reduction of LID facilities increased with the increase of rainfall intensity,and the reduction rate showed a general downward trend.LID facilities generally play a more significant role in rainwater control of urban roads under the condition of small and medium-sized rains(once every two years or less).In urban road landscape design,more attention should be paid to the application of permeable pavement materials to reduce the load of rainwater regulation and control of road green space.