基于TELEMAC-2D模型的济南市洪涝模拟及淹没分析

Flood simulation and inundation analysis in Ji’nan City based on TELEMAC-2D model

基于TELEMAC-2D模型构建了济南市洪涝仿真模型,选取济南市“20070718”实测典型暴雨城市内涝淹没资料对模型进行了验证,结果表明模拟水深误差较小,模型具有较高的精度和可靠性。采用构建的模型模拟了不同暴雨重现期下济南市主城区的洪涝演进过程,并分析了研究区淹没水深、淹没面积和洪水流速等特征,结果表明:随着降雨重现期的增大,研究区淹没水深大于0.15 m的面积在总面积中的占比随之增大,当降雨重现期分别为1、5、10、20、50、100 a时,面积占比分别为0.05%、1.10%、1.98%、2.89%、4.28%、5.15%,最大洪水流速分别为0.478、1.019、1.309、1.494、1.890、2.214 m/s;根据洪涝淹没特征,从工程和非工程措施两方面提出了防洪排涝应对举措。

A flood simulation model of Ji’nan City was constructed based on the TELEMAC-2D model,and the inundation data of a typical rainstorm of“20070718”in Ji’nan City were selected to validate the model.The results show that the error of simulated water depth is small,indicating that the constructed urban flood simulation model has high accuracy and reliability in flood simulation.The flooding evolution processes under different rainfall return periods were simulated,and the submerged depth,inundated area,and flood velocity in the study area were analyzed.The simulation results show that,with the increase of the rainfall return period,the ratio of area with water depth greater than 0.15 m to the total area also increases.For the rainfall return period of 1,5,10,20,50,and 100 years,the area ratios were 0.05%,1.10%,1.98%,2.89%,4.28%,and 5.15%,respectively,and the maximum flood velocities were 0.478,1.019,1.309,1.494,1.890,and 2.214 m/s,respectively.Based on the characteristics of flood inundation,engineering and non-engineering measures for urban flood prevention and drainage in Ji’nan City were proposed.