Research on Evolution of Urban Flood Resilience Based on Loss Function
To enhance urban flood protection and resilience to floods,and to advance the new strategy of human-centered urbanization,Weifang's urban area was selected as the study area. The CAflood model,based on cellular automata,was employed to derive inundation depth data. Using data mining and similarity analysis,urban loss rate was referenced and applied to establish an inundation depth-loss rate function for the study area. Based on this function,an urban flood resilience model was devel-oped,which was then used to calculate the flood resilience index distribution in Weifang's urban area under rainfalls with 5,50,100 and 200-year return periods. Additionally,the temporal and spatial trends of flood resilience in Weifang's urban area were analyzed under three different land use scenarios for 2012,2017 and 2022,revealing the relationship between urban evolution and regional flood resil-ience. The results indicated that the flood resilience of the Weifang's urban area generally decreased with an increase in return periods. The most significant decreases were primarily observed in the cen-tral urban area,streets,and the eastern development zone,which have a higher proportion of man-made surfaces,as well as in the flat and low-lying areas around rivers. Spatially,the declining trend expanded outward from the central urban area. Moreover,as urbanization intensifies,the average re-silience index in each sub-district of the study area decreased to varying extents. Among these,the C7 hilly area consistently showed a higher level of resilience,while the C4 high-tech development zone exhibited lower resilience under various simulation scenarios. The higher the degree of urbanization,the greater the decrease in the average resilience index of sub-districts after the same return period rain-falls. The research results provide scientific support for Weifang to address the growing flood risk and to implement strategies to enhance urban flood resilience in the future.
Weifang's urban arealoss rate functionflood resilience indexurban flood control