Comprehensive analysis on causes of flood disaster in megacities:A case study of Chongqing
In recent years,extreme meteorological and hydrological events have become more frequent and intense,and the frequent occurrence of flood disasters in a rapidly evolving environment has brought severe challenges to socio-economic development.This study focuses on Chongqing,one of two principal cores within the megacities of western China,part of the Chengdu-Chongqing urban agglomeration.This city's terrain,predominantly hilly and mountainous,together with its proximity to upstream rivers and the backwater of the Three Gorges Reservoir Area(TGRA),highlights its exposure to the threat of flood disasters.This study focuses on Chongqing's historical flood disaster events to assess the current state of flood prevention and disaster reduction efforts within the city.The authors further analyze the impact of various factors,including hydrology,geography,topography,urbanization,and meteorological conditions,on both the frequency and intensity of flood disasters in Chongqing.Alongside these causal factors of flood disasters,the authors further delve into the analysis of Chongqing's disasters—Forming environment and the entities that bear these disasters.Finally,countermeasures are provided.The findings indicate that the occurrence of flood disasters in Chongqing is influenced by various factors,and its special location and characteristics of the mountain city determine the difficulty of flood prevention and management in Chongqing.Notably,the city's complex terrain and numerous rivers creat the conditions conducive to flood disasters.Given the evolving circumstances brought about by meteorological hydrology and socio-economic development,it is imperative to proactively reassess and optimize Chongqing's urban flood disaster prevention system.This should be done in accordance with the unique flood disaster characteristics that have emerged following the completion of the TGRA and the current flood control and waterlogging prevention capacity of the urban area.
urban disastersflood disastersdisaster prevention and reductionflood control planning
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