极端暴雨导致城市地铁水灾:现状、成因及防洪措施OA

In recent years,the increasing frequency and intensity of extreme rainfall events have significantly amplified the risk of urban flooding.Such events not only cause severe damage to surface infrastructure but also pose critical threat to underground systems,inluding metro networks and underground parking facilities.This study reviews representative metro flood incidents over the past decade,with particular focus on the Hong Kong"9·8"rainfall event and the Zhengzhou"7·20"extreme rainstorm.Through a comparative analysis of the flooding processes and associated impacts,deficiencies in flood prevention planning and emergency response systems are identified,particularly in the Zhengzhou case.Based on these case studies,the predisposing environmental conditions and governing mechanisms of metro flooding are examined.To effectively prevent flood intrusion,metro entrances and exits should be located in relatively elevated areas and designed in strict accordance with flood protection standards.At the same time,protective facilities should be installed at the exit or entrance of the metro station.As an innovative flood control facility,the hydrodynamic automatic floodgate is specially designed for underground infrastructures,which can effectively resist flood intrusion during extreme rainfall events.In addition,this study puts forward prospects for metro flood control countermeasures,emphasizing the establishment of an early warning system,preemptive intelligent early warning of urban flood risks,strengthening urban emergency management,and public disaster awareness.The findings provide a theoretical basis and practical guidance for urban flood mitigation and the safe operation of metro systems.