Urban Comprehensive Disaster Risk Assessment

The frequent occurrence of urban disasters and the resulting losses and development of cities.The prevention and control of urban disaster risks have become an urgent problem to be solved.In the complex urban environment,multiple disaster risks coexisting and a single disasters being evaluated separately are no longer able to meet the requirements of urban disaster risk management.It has become a key link in disaster risk management and the basic basis for urban disaster prevention and mitigation planning.The typical disaster risk assessment methods are compared and analyzed,and pointed out their advantages and disadvantages.Among them,the risk factors mainly analyze different types of disasters in cities.Exposure factors consider the impact of disasters on population,construction,economy,and infrastructure.Vulnerability factors analyze the vulnerability of old and young populations,floating populations and old buildings.The resilience index is based on the prevent and mitigate disasters.21 indicators were selected to establish an integrated risk assessment index system for urban disasters.Based on the partial weight information given by experts and the principle of TOPSIS method,the index weight determination model based on TOPSIS is approached to the positive ideal solution,And find the weight.The cloud model-based urban disaster comprehensive risk assessment model is constructed,and the standard comment cloud model of disaster risk is determined.The data is input into the comprehensive risk cloud model derived from the cloud generator,and the cloud map is output to determine the risk level of the disaster.Finally,taking a city as an example,the risk assessment of the downtown area is carried out,and the risk model of the risk,exposure,vulnerability and emergency support capability of the central city and the cloud model of comprehensive risk assessment are obtained.The results are related to the actual disaster risk of the city.The situation is basically the same,verifying the applicability of indicators and models,and proposing countermeasures and recommendations for urban disaster risk prevention and control.Figure 30;Table 25;Reference 88.