基于LID的城市内涝情景模拟研究

The Simulation of Urban Waterlogging Scenario Based on Low Impact Development

随着城市发展,城市内涝问题已不容忽视。由此提出了“海绵城市”和“低影响开发(low impact development)”的概念,为缓解城市内涝带来的多种问题,本篇基于地理信息系统技术和SWMM(storm water management model)模型,模拟了不同重现期下、不同低影响开发设计方案下的城市雨洪响应效果。结果表明,LID对总径流量削减、洪峰流量削减、径流系数削减效果显著;组合LID的城市内涝控制效果优于单一LID方案;透水铺装&雨水花园&绿色屋顶的组合LID方案对总径流量削减、洪峰流量削减、径流系数的削减成效明显优于单一LID方案和两两LID组合方案。以上结论为缓解城市内涝灾害问题提供借鉴。

With the development of cities,the problem of urban waterlogging can not be ignored.Hence,the concepts of“sponge city”and“low impact development”were proposed.In order to alleviate various problems caused by urban waterlogging,this paper simulated the response effects of urban storm flood under different recurrence periods and different low impact development designs based on geographic information system technology and storm water management model(SWMM).The results show that:LID has significant effect on the reduction of total runoff,peak runoff and runoff coefficient.The rain flood control effect of combination LID scheme is better than that of single LID scheme.The combinations of permeable pavement&rain garden&green roof have better flood control performances than single LID schemes and pairwise LID combination scheme.The above conclusions provide reference for relieving urban waterlogging disaster.