Sponge city is an important Low Impact Development (LID) pattern,and also is a key to solve the urban water issues in China.In this study,we focus on the three core tasks including urban flood control and drainage,non-point source pollution control and urban rainfallflood utilization,and explore the key technology and methodology to support the implementation of sponge city from the perspective of virtuous-water-cycle (e.g.,the numerical simulation and LID optimization techniques),and finally develop an urban rainfall-flood model (HIMSURBAN).This model is applied in Changde City,which is one of the first batch of sponge city.The results demonstrate that:1) runoff coefficient in Changde City ranges from 0.33 to 0.81 in current state,with an average of 0.64.2) Based on the objective of controlling total annual runoff,several LID measures (e.g.,infiltration,storage and retention),are employed to consume the runoff from each block.By optimization,the controlling objective can be achieved in 90％of urban blocks.The areas of sunken green space,permeable pavement and green roof are 496.75,1338.15 and 613.21 hm2,respectively,and the total area of LID measures accounts for from 3.9％ to 31.4％ of each block's area.The reduction rate of pollution load SS is between 45.0％ and 47.7％,with an average of 46.1％.By adopting the LID measures,the outputs of storm runoff and the pollution load in Changde urban area are remarkably reduced,and the control objective is almost achieved.This study provides great valuable results for construction of sponge city in Changde City,and also gives a good reference of theory and technology for urban planning and design.
flood control and drainagediffuse source pollutionstormwater utilizationsponge cityChangde
NETL
NSTL
万方数据
维普
