Assessment and spatiotemporal analysis of flood vulnerability in the yangtze river economic belt
[Objective]Systematically analyzing the vulnerability and spatiotemporal characteristics of flood disasters in various provinces of the Yangtze River Economic Belt,could provide decision-making basis for disaster prevention and reduction.[Methods]The vulnerability assessment model was constructed based on the Exposure-Sensitivity-Adaptive capacity(ESA)framework,adopting the entropy weight method and multi-level fuzzy comprehensive evaluation method to assess and analyze the social vulnerability and spatiotemporal distribution characteristics of floods in the Yangtze River Economic Belt.[Results]The result indicate that:(1)The distribution of flood vulnerability in the Yangtze River Economic Belt exhibits characteristics of low downstream,moderate midstream,and high upstream.The average vulnerability index of the upstream region is about 4 times that of the downstream region and 2 times that of the midstream region.(2)From the perspective of time distribution,the expo-sure and adaptability of the vulnerability of the Yangtze River Economic Belt increased slightly from 2009 to 2019,while the sen-sitivity continued to decrease.Overall,the vulnerability showed a continuous decrease,and the disaster prevention capacity of the Economic Belt was increasing year by year.(3)The influencing factors of flood vulnerability in the Yangtze River Economic Belt exhibit significant spatial heterogeneity,with high adaptability and low sensitivity being the reasons for low downstream vul-nerability;Low adaptability is the main reason for high vulnerability areas in the middle and upper reaches;High exposure and high sensitivity are the main influencing factors in Hunan Province.[Conclusion]Targeted disaster prevention and mitigation measures should be proposed based on the dominant factors of vulnerability in different regions.For areas with inadequate urban infrastructure construction capabilities,such as Jiangxi and Sichuan provinces,their infrastructure adaptability index contributes 43％and 47％,respectively,to the total adaptability index.Therefore,efforts should be made to improve their drainage infra-structure,strengthen flood control and drainage facilities,increase green areas,build sponge cities,and enhance urban resili-ence.In areas where the number of reservoirs is insufficient,leading to weak disaster resistance capacity,such as Guizhou Prov-ince,efforts should be accelerated to reinforce and upgrade vulnerable water conservancy projects and conduct assessments of small-scale reservoir system governance.
social vulnerabilityspatiotemporal changeentropy weight methodmultilevel fuzzy comprehensive evaluationYangtze River Economic Beltclimate changehuman activitiesflood disaster
万方数据
维普
