海绵城市建设中建成区雨洪格局的量化研究

Quantitative research on rain-flood patterns of urban area in the construction of “Sponge Cities”

【目的】探索海绵城市背景下的城市雨洪安全格局研究新方法,结合实例确定研究区的易涝区域和径流量。【方法】将SCS-CN水文模型的定量分析与GIS空间模拟工具相结合,以扬州江都区为例,建立了"从数据到空间"的建成区雨洪格局研究与表达方法。【结果】通过SCS-CN水文模型较为准确地计算了扬州市江都建成区在单场雨量为40 mm的降雨过后,城市各类用地的雨水径流分布数据;通过GIS空间模拟技术与SCS-CN模型相结合,将雨水直接径流量的分布在城市空间中量化表现;根据计算出的各类用地的径流总量,对雨水径流总量最多的3类用地进行GIS空间模拟,直观地反映出建成区内易涝的地块。【结论】SCS-CN水文模型与GIS空间模拟工具相结合可以直观有效地反映暴雨过后的城市内涝状况,便于采取针对性措施建设海绵城市。

【Objective】Explore new approaches to the safety pattern of urban rain and flood under the background of Sponge City then determine the inundated area and the amount of runoff.【Method】Combine the quantitative analysis of SCS-CN hydrological model with the GIS space simulation tool,and set up the research and expression method of ＂data to space＂.【Result】Firstly get the distribution data of rainfall runoff of different kinds of land in the city of Jiang Du by using the SCS-CN hydrological model.The second is the combination of the GIS space simulation and the SCS-CN model,and the distribution of the direct runoff of rainwater in the urban space.The third is use the GIS space simulation tool to simulate the three types of land use of rainwater which amount up,based on the various types of land use is calculated according to the runoff amount,intuitively reflect the waterlogged land of the built area.【Conclusion】The research indicates that the SCS-CN model combining with GIS tools can more effectively reflect the status of the city after the heavy rain water logging,easy to take targeted measures to build Sponge City.