期刊
ENGINEERING GEOLOGY
卷 293, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.enggeo.2021.106280
关键词
Multi-hazard chain; Debris flow; Landslides; Dynamic modeling; Hazard assessment
资金
- Major Program of the National Natural Science Foundation of China [41790433]
- Hundred Young Talents Program of IMHE [E0K2130130]
- National Key Research and Development Program of China [2018YFC1505003]
- Sichuan Science and Technology Program [2021YFSY0036, 2019YFG0460]
- National Natural Science Foundation of China [41772312]
- Key Deployment Project of CAS [KFZD-SW-424, KFJ-STS-QYZD-172]
- Foundation for Young Scientist of Institute of Mountain Hazards and Environment, CAS
- CAS Light of West China Program
This study investigated the formation and impacts of a disaster chain induced by a debris flow along the Xiaojin River on the eastern Tibetan Plateau of China. The research demonstrated that multiple factors contributed to the generation of the disaster chain, and detailed analysis was conducted on the activation of potential landslides and the evolution of flooding.
The damage caused by a single natural hazard can be amplified in time and space to form a disaster chain. One such chain was induced by a debris flow that occurred on June 17, 2020 along the Xiaojin River on the eastern Tibetan Plateau of China. The debris flow dammed the Xiaojin River, and subsequent dam breaches instigated a multi-hazard chain that flooded many towns upstream; moreover, the flooding reactivated an ancient landslide downstream, the Aniangzhai landslide. To understand the failure mechanism and risk of such events, a combination of in-situ investigation, remote sensing analysis, and simulation were performed. Field investigations and high-resolution images confirmed that two potential sliding masses detached from the slope, with a overall volume of approximately 30 million m(3). To understand the overall disaster chain and evaluate the effects linked to these potential sliding masses, the multi-hazard chain was systematically analyzed using various data and approaches, Finding shows that the reactivation of the Aniangzhai landslide are resulted from the continuous down-cutting and erosion by outburst flooding. Finally, the hypothetical scenarios analyses were completed with respect to the landslide dam and resultant flooding. Integrated studies of disasters based on such a systematic approach can be applied to future analysis of similar hazard chains.
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