Risk Assessment And Early Warning Mechanism Of Waterlogging Disaster In Wuhan

Urban Storm Waterlogging is one of the major meteorological disasters in urban development.With the development of the city and modernization,the study of urban storm waterlogging is more and more urgent.The risk management of city rainstorm waterlogging disaster is to deal with an effective management ideas and methods,and has been widely recognized by the international community.Risk assessment is the basis and premise of risk management,has been widespread concern in academic circles.Wuhan is mainly affected by the subtropical monsoon climate,where precipitation concentrated,sudden rainstorm weather and rainy weather occurred in an unbroken line frequency are relatively high.And the rainfall seriously threaten the personal property of the city social economy development and people's safety,and affect the sustainable development of the city,therefore,research on city of waterlogging disaster to ensure the harmonious and stable social and economic development,has very important significance to promote the sustainable development of the city.In this paper,on the basis of research documents and on-the-spot investigation,considering disaster science,climatology,hydrology,geography,environment and other multi-disciplinary content,make full use of remote sensing image data and the geographical space technology,using the principle of weighted comprehensive evaluation method,and the analytic hierarchy process of Wuhan urban rainstorm waterlogging disaster to weight calculation,construction of Wuhan rainstorm waterlogging disaster risk assessment system,realize to the rainstorm waterlogging disaster risk assessment of Wuhan.Then,based on the WRF numerical weather forecasting technology,the risk assessment model of rainstorm and waterlogging in Wuhan is post-processed,and the early warning mechanism of rainwater flood disaster is established.The main conclusions of this paper are as follows:(1)Establishing the theory and method of risk assessment of rainstorm waterlogging in Wuhan,and constructing the disaster risk assessment model.Firstly,this paper analyzes,defines and collates the theory of rainwater flood,disaster risk and risk assessment,and puts forward the theoretical framework of risk assessment of urban rainstorm in Wuhan.Considering the risk of disaster-causing factors,the sensitivity of affected environment and the vulnerability of affected people,the disaster risk assessment model is constructed.The weight of each influencing factor is determined by using analytic hierarchy process(AHP).Then,using remote sensing image data and geospatial technology respectively on the hazard risk,disaster environmental sensitivity,disaster vulnerability factors analysis and research..(2)The establishment of Wuhan rainstorm waterlogging disaster early warning system.Based on the disaster risk assessment model,the precipitation process from July 1 to July 8 of 2016 was simulated by WRF model,and the simulated precipitation data were input into the rainstorm waterlogging disaster risk model,and discusses the feasibility of the disaster early warning system.The risk assessment model of urban rainstorm and the construction of early warning mechanism can prorvide strong scientific and technical support for the corresponding disaster emergency measures and disaster reduction strategies in Wuhan.