多类型暴雨模式下城市内涝致灾机制分析OA

To examine how storm temporal patterns affect urban waterlogging,a case study was conducted in Hanyang District,Wuhan City.We identified six representative rainfall patterns from observed precipi-tation records,and developed a coupled hydrodynamic model to simulate the waterlogging responses under different combinations of rainfall patterns,return periods,and lake water levels.The results show that high-risk waterlogging areas were mainly concentrated in the upstream sections of the Longyang Lake and Moshui Lake.Under the scenario of pre-flood lake level and 100-year return period rainfall,the rear-peak pattern produced the largest proportion of extremely high-risk areas(0.21%),followed by the double-peak rear-peak pattern and the front-peak pattern;whereas the double-peak uniform pattern showed the lowest risk.Short-duration intense rainfall exceeding the drainage capacity was the direct trig-ger of urban waterlogging,and both highly concentrated rainfall peaks and delayed peak timing tended to increase the pressure on the drainage network.The front-peak and double-peak rear-peak patterns exhibi-ted relatively high risk under larger return periods.At low lake water levels,drainage network capacity dominated the waterlogging process,whereas at high lake levels,limited storage capacity and the timing of gate and pump operations became the key controlling factors.These findings provide a reference for drainage scheduling and risk mitigation under complex rainfall conditions.