54 / 2025-08-08 00:21:00

Land Subsidence Disaster Chains in Shanghai: Characteristics and Mitigation Challenges

Land Subsidence,disaster chain,resilience-based mitigation,disaster chain characteristic

In the context of global climate change and rapid urban renewal, Shanghai faces severe challenges to its urban geological security, with land subsidence being particularly prominent. The city's soft soil exhibits the characteristic "three highs and one low" – high compressibility, high water content, high sensitivity, and low strength. Coupled with intensive human engineering activities, these conditions significantly exacerbate land subsidence risks. Crucially, land subsidence often acts as the initiating hazard, triggering a cascade of secondary disasters such as pipeline ruptures and structural damage to buildings. This forms a land subsidence disaster chain characterized by coupled compounding and cascading amplification effects, substantially increasing the complexity and severity of the hazards. To address these challenges, this paper systematically reviews the formation mechanisms, evolutionary patterns, progress, and limitations of existing research on land subsidence disaster chains in Shanghai. Building on this analysis and integrating the concept of disaster resilience, the study proposes a comprehensive resilience-based mitigation strategy framework tailored to Shanghai's context. This framework aims to enhance the city's overall resistance, adaptability, and recovery capacity against land subsidence disaster chains.