基于InfoWorks ICM的南宁市排水管网能力及内涝风险模拟评估

Simulation and Assessment of Drainage Network Capacity and Waterlogging Riskin Nanning City Based on InfoWorks ICM

采用InfoWorks ICM软件搭建了南宁市约903.22 km^(2)的城市综合流域排水模型,利用该模型系统性评估了研究区在重现期分别为1、2、3、5年的2 h暴雨情况下排水管网的排水能力和重现期为50年一遇24 h暴雨情况下城市内涝风险。评估结果表明:研究区内新老城区的管网排水能力和内涝风险差异较大,管网排水能力较差、洪水风险较高的区域主要集中在青秀、西乡塘、高新、江南片区的老城区。

An integrated urban drainage model of about 903.22 km^(2) in Nanning city was built by using InfoWorks ICM software.The model was used to systematically evaluate the drainage capacity of drainage pipe network under the condition of 2-hour rainstorm with the return period of 1,2,3 and 5 years,and the urban waterlogging risk under the condition of 24-hour rainstorm with the return period of 50 years.The results showed that the drainage capacity and waterlogging risk of the new and old urban areas in the study area were quite different.The areas with poor drainage capacity and high flood risk were mainly concentrated in the old urban areas of Qingxiu,Xixiangtang,Gaoxin and Jiangnan.