Calculate the resilience value amongst 4 cities in Yangtze River Delta region in China to discover the changes in urban resilience under the impact of COVID-19

The global spread of the COVID-19 has had a significant impact on lots of cities. However, this crisis also provides a crucial opportunity to determine the drawbacks in the city’s construction and propose solutions for improvement. In detail, the fluctuations in a city’s urban resilience values between 2020 and 2022 can present its ability of withstand the disaster or recover quickly. This constitutes the central idea of the study. This study will discuss the concept of urban resilience, introduce the four target research cities located in the Yangtze River Delta of China, explain the rationale for selecting the entropy method and the specific calculation process, present the design ideas of the indicator system and justify the selection of certain specific indicators, analyse the calculated values, and finally offer recommendations for future construction in each city. In the Explanation section, a substantial amount of research on the targeted city is cited to provide a reasonable explanation for some strange calculation results. The division of urban resilience into five aspects (economic, infrastructure, ecological, social and community) allows for the identification of specific weaknesses, which in turn informs the targeted suggestions made for each city in the subsequent section. Furthermore, the successful experience of analogous urban construction in the past is also referenced, thus rendering these suggestions highly feasible.