New insights into the delayed initiation of a debris flow in southwest China

Taixin Peng, Ningsheng Chen (), Guisheng Hu, Shufeng Tian, Zheng Han and Enlong Liu
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Taixin Peng: Chinese Academy of Sciences (CAS)
Ningsheng Chen: Chinese Academy of Sciences (CAS)
Guisheng Hu: Chinese Academy of Sciences (CAS)
Shufeng Tian: Chinese Academy of Sciences (CAS)
Zheng Han: Central South University
Enlong Liu: Sichuan University

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2021, vol. 108, issue 3, No 22, 2855-2877

Abstract: Abstract On 6 July 2020, 3 h 40 min after rainfall stopped, a delayed debris-flow disaster occurred due to colluvium deposits in a hollow region (CDH) in the Chenghuangmiao Gully, Sichuan Province, China, resulting in 4 deaths and 27 injuries. This study explores the initiation process of the delayed debris flow and the cause for the delay. Field investigations, catchment geometry interpretation, laboratory tests, theoretical calculations, and fluid–solid coupling numerical simulation were performed to obtain landslide parameters and understand the mechanisms of the event. Results show that (1) the event was a giant low-frequency viscous debris flow. (2) It was initiated by the delayed landslide process under the influence of back-end confluence. (3) The debris-flow discharge in the main gully increased over 19.5 min. (4) The seepage process inside the CDH continued for 3 h 20 min after the rainfall stopped before the pore pressure and reduction in strength were sufficient to initiate the debris flow. This research provides new insights on delayed debris-flow disasters and can be a reference for improving disaster management systems, especially monitoring and early warning systems, thereby avoiding future casualties.

Keywords: Delayed debris flow; Hollow deposits; Landslide initiation; Fluid–solid coupling (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1007/s11069-021-04803-9

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