The Effect Of Different LID Combinations On The Storm Flood Control In The Industrial Zone And Its Comprehensive Evaluation

In order to alleviate the adverse impact of urban waterlogging on people’s life and production and promote the planning and construction of sponge cities in China,this paper takes an industrial park in Huainan as the research object,and constructs five different LID(Low impact development)combinations in the study area based on SWMM model:scheme 1(rainwater tank+vegetation shallow ditch),scheme 2(rainwater tank+vegetation shallow ditch+permeable pavement)and scheme 3(rainwater tank+rainwater garden+pervious pavement),scheme Ⅳ(rainwater tank+vegetation shallow ditch+pervious pavement+green roof)and scheme Ⅴ(rainwater tank+rainwater garden+pervious pavement+green roof),and analyze the water quantity and water quality of each scheme.In order to better evaluate each scheme,a comprehensive evaluation method is proposed.10 evaluation indexes are selected and weighted according to the combination weighting method.Finally,TOPSIS method is used to comprehensively evaluate each scheme.The main conclusions are as follows:(1)Different schemes can achieve good water reduction effect.For runoff coefficient,scheme Ⅴ(rainwater tank+permeable pavement+rainwater garden+green roof)has the best reduction effect,which can reach the reduction rates of 72.01%at most.For peak flow,scheme Ⅳ(rainwater tank+permeable pavement+shallow vegetation ditch+green roof)has the best reduction effect,with a reduction rate of 48.08%at mos.(2)In terms of water quality control,scheme 4 has the best control effect on TSS and TP,with the highest reduction rates of 90.59%and 80.05%respectively;Scheme 5 has the best effect on TN reduction,which can reach a reduction rate of 80.53%;For COD,when the rainfall return period p<5a,the control effect of scheme 4 is the best,which can reach the reduction rate of 84.69%,but when the return period increases,the control effect of scheme 5 is better.(3)The effect of various schemes on water reduction and water purification decreases to a certain extent with the increase of return period.With the increase of rainfall intensity,the schemes that have an obvious impact on the reduction rate of water quantity and quality are:scheme 4>scheme 5>scheme 2>scheme 3>scheme 1.(4)Through the comprehensive evaluation method,the advantages and disadvantages of each scheme are sorted.The scheme most suitable for the study area is scheme Ⅲ(rainwater tank+permeable pavement+rainwater garden).Comparing the comprehensive benefits of different schemes,the comprehensive performance of a single low impact development facility can be evaluated:permeable pavement has good comprehensive performance in the scheme;Compared with the vegetation shallow ditch,rainwater garden has better comprehensive performance;Compared with green roof,rainwater tank is more suitable for low impact development facilities in LID combination scheme.Figure[28]Table[40]Reference[82]...