基于GIS的子汇水区划分对城市积涝模拟的影响研究

Study on the Influence of Sub-catchment Area Based on GIS on Urban Waterlogging Simulation

结合GIS和SWMM模型原理,探讨了两种不同子汇水区划分方法下积涝模型的模拟结果,以期为进一步理解模型的运行机理和构建方法上提供帮助。实验表明:对于城区建筑物云集的环境,人工手动划分子汇水区可以更灵活地避开建筑物,划分结果更加合理。小区域的雨洪模拟采用精细划分的汇水区能取得理想的模拟效果,但若欲研究大区域中雨水淹没状况,则可以考虑深度概化雨水管网后的子汇水区划分方式。

Combined with the principle of SWMM and GIS,this paper investigate the simulation results of two different sub-catchment area partition methods,in order to help further understand the operation mechanism model and construction method. Experiments show that： for the urban buildings gathered in the environment,artificial manual sub-catchment area can be more flexible to avoid the building,the division of the results are more reasonable. In the small area,the rainwater simulation can achieve the ideal simulation effect by using the fine watershed. However,if the researchers want to know the rainwater submergence in the large area,they can consider the sub-watershed division after the generalization of the stormwater pipe network.