jailcd2024047: Urban Resilience through the Lens of Urban Mobility - Study of Urban Flooding Event in Zhengzhou, China

Abstract

Under the pressure of rapid urbanization and climate change, increasingly frequent urban floods have become a major threaten for Chinese mega cities. Urban resilience has received widespread attention and became strategical development goal. Metric resilience evaluations lay the foundation for urban disaster resilience assessment, but researchers need to develop resilience measurement technique that can reveal the complex interaction of urban components and capture the spatiotemporal dynamics in community recovery processes. In this paper, we develop a method for measuring urban disaster resilience from a spatiotemporal urban mobility perspective. Taking the major urban flooding disaster in Zhengzhou, China, in 2021 as a case study, we tracked the mobility trajectory of 2 million residents before, during, and after the disaster, plotted the activity intensity dynamic curve for each community, and defined urban community resilience as a time function related to activity intensity. Based on this, the resilience capacity of each community was quantified, and four dynamic recovery patterns were identified through hierarchical clustering. Finally, the spatial influencing factors of resilience capacity and recovery pattern were explored. This study provides a new perspective for understanding the assessment of urban resilience and offers a scientific basis for decision-making in urban planning and urban management.