Comprehensive risk management of reservoir landslide-tsunami hazard chains: a case study of the Liangshuijing landslide in the Three Gorges Reservoir area

• DOI: 10.1007/s10346-024-02283-z
• Publication Date: 2024-06-14T03:44:19Z
• Authors: Ye Li; Xiaoxu Xie; Bijing Jin; Lixia Chen; Xin Liang; Kunlong Yin
• Keywords: Natural hazard

Abstract Landslide-induced tsunamis in reservoirs often pose greater risks than landslides themselves. Existing studies and mitigation practices have prioritized increasing landslide stability to meet safety standards, incurring high costs lacking sustainability. More 5000 developed along the Three Gorges Reservoir banks China, some may trigger tsunamis. To effectively sustainably manage risk of landslide-tsunami hazard chains (LTHC), we propose a new framework (based on quantitative analysis) involves decision-making based characteristics local economies, strategy for selecting optimal control plan through cost–benefit analyses that consider long-term effectiveness adverse effects, dynamic management iterative reassessment-recontrol cycles. The Liangshuijing accelerated 2009, posing tsunami threat Yangtze River coastal residents. Post-mitigation, under four plans combined scenarios were quantitatively evaluated. mass removal reduces total by approximately 68%, less 80% reduction from anti-slip pile plan, but with 30-fold benefit–cost ratio (BCR). surface drainage monitoring network show limited cost-effectiveness due short measure lifetimes, however, their short-term BCRs exceed those lower direct costs. According comprehensive long analyses, involving are most cost-effective. Our results reveal how select appropriate strategies managing LTHC risk, controls risks, time-related parameters affect solution effectiveness. findings partially mitigating provide more cost-effective sustainable LTHCs eliminating negligible levels.