基于PCSWMM模型的城市内涝风险评估

Risk assessment of urban waterlogging based on PCSWMM model

构建了基于PCSWMM的海甸岛城市雨洪模型,采用3场次实测暴雨(20081013,20101005和20111005)内涝淹没资料对模型进行验证,结果表明所构建模型具有良好的精度和可靠性。以1 a、2 a、5 a、10 a和20 a 5种设计重现期降雨组合同频率设计潮位进行模拟计算,对海甸岛现状排水能力进行评估,结果表明,海甸岛84.8%管网排水能力低于1年一遇。以5 a、10 a、20 a、50 a降雨组合对应潮位对海甸岛进行内涝风险评估,得到了海甸岛4种不同重现期暴雨的内涝风险等级划分状况。

An urban rainstorm model based on PCSWMM for Haidian Island in Haikou City was developed. The model was verified by three measured rainfalls events and the corresponding tidal graph records in 20081013,20101005,and 20111005. The simulated waterlogging submerged positions and depths are basically consistent with the actual investigation situation,which shows that the model has high precision and reliability. It respectively evaluated the present situation of drainage networks and the waterlogging risks in Haidian Island in Haikou City by using design rainstorms of return periods of 1,2,5,10,20,and 50 years with the corresponding tidal levels. The result shows that the present situation of 84. 8% of the drainage networks in Haidian Island in Haikou City is less than 1-year design return period. Meanwhile,the waterlogging risk assessment of design rainstorms with 5,10,20,50-year return periods and three measured rainstorms with the corresponding tidal levels are analyzed.