Flood Disaster Risk Assessment in Liaocheng City Based on Combination Weighting
To improve the emergency response capacity of cities in dealing with flood disasters,taking Liaocheng City in Shandong Province as the study area,based on the basic principles of flood disaster assessment,a flood disaster assess-ment index system was constructed by selecting indicators such as annual average precipitation,elevation,slope,distance from water bodies,population density,land use type,Gross Domestic Product(GDP),from three aspects of causative factors of flood disasters,disaster-prone environment,and vulnerability of disaster-affected bodies.The subjective and objective weights of each indicator were determined using the analytic hierarchy process and entropy method,and the comprehensive weights of the indicators were determined using a distance function.Using geographic information system,the weighted grid maps were calculated to obtain the flood hazard,vulnerability,and flood risk zoning maps of the study area.The results show that the areas with higher flood risk in the study area are mainly distributed within Dongchangfu District,where there is high precipitation,well-developed water systems,dense population distribution,and high levels of economic development.The southwestern and northeastern parts of the study area have lower flood risk due to lower precipitation and sparse population.The flood risk in the study area increases first and then decreases from southwest to northeast.
disaster prevention and mitigationflood disaster risk assessmentcombination weightingentropy methodgeographic information system
万方数据
维普
