When the difference in size between two cities is large enough, the vulnerability of the larger city is significantly lower. And there is a non-strictly negative correlation between urban vulnerability and urban size. The better the economic situation, the lower the urban vulnerability. In contrast, the results for 2019 are the opposite, with 1 city with very high vulnerability and 5 cities with very low vulnerability. There are 5 cities with very high vulnerability and 1 with very low vulnerability in 2010, accounting for 15.15% and 3.03% of the total number of cities, respectively. The results indicate that the overall vulnerability of Southwest China shows an irregular downward trend and strong spatial heterogeneity. Game theory and TOPSIS were combined to minimize the impact of subjective factors on the results. The four major systems were integrated, and a comprehensive vulnerability evaluation index system was constructed. In this study, prefecture-level cities in Southwest China were taken as the study area, and their vulnerability was studied dynamically from 2010 to 2019. Against the backdrop of the increasingly prominent urban disease, a comprehensive urban vulnerability assessment has a positive effect on improving the quality of urbanization. Natural hazards and urbanization put enormous pressure on cities and affect their sustainable development.

Urban scrawl 2019