城市洪涝灾害韧性时空演化特征研究OA

The resilience construction of urban flood disaster is an important way and effective means to improve the ability of urban flood risk response and rapid recovery.According to a three-dimensional evaluation index system of urban flood disaster resilience based on pressure-state-response theory,the flood disaster resilience level of 284 cit-ies in China from 2011 to 2020 is evaluated by using the range maximization combination weighting optimization model,and its spatial-temporal pattern and dynamic evolution are revealed by using kernel density estimation and Mar-kov chain.It is found that the resilience level of urban flood disasters in China is gradually improving,the develop-ment of pressure toughness is relatively stable,the state toughness fluctuates greatly and decreases,and the response toughness is obviously improved.Kernel density estimation and Markov chain analysis show that the resilience of urban flood disasters has a strong persistence without considering the spatial conditions,and the state transition is not easy to occur in each region.When considering the spatial conditions,the neighboring regions with medium and low toughness levels have convergence,while the regions with high toughness levels are not easy to have spatial correla-tion with neighboring regions.The probability of achieving a leap-forward improvement in the toughness level of this region is increasing,and the toughness level of neighboring cities can radiate and affect the toughness improvement of this region,but the impact is limited.