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01-07-2024 | Case Study

Preliminary analysis of the mechanism in the July 16, 2022 Gaojiashan cascading hazard: a landslide-induced debris flow in Southwest China

Authors: Taixin Peng, Ningsheng Chen, Martin Mergili, Runing Hou, Shufeng Tian

Published in: Bulletin of Engineering Geology and the Environment | Issue 7/2024

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Abstract

Debris flows can be triggered by landslides and lake outbursts, constituting cascading hazards that pose threats to life and property. However, cascading mechanisms are poorly understood due to the complex energy transfer and material transformation among precipitation, landslides, floods, and debris flows. Here, we aim to identify the cascading mechanisms and key controls of the Gaojiashan debris flow and provide insights applicable to other cascading hazards. Our study integrates field measurements and numerical simulations, combining data on runoff discharge, landslide stability, overtopping volume, and debris-flow discharge. We show that gravity-driven high-altitude water sources control the weakening and entrainment of sediment sources in cascading. Water convergence and seepage due to intense precipitation, elevate pore pressure and weaken sediment sources, triggering landslides and initiating cascading hazards. Water from the overtopped landslide impulse wave, combined with runoff, entrained wet gully bed materials, and formed the debris flow. A physical approach that accounts for the strength of wet sediment sources and the paths of unstable water release in mountains may therefore be applicable for assessing cascading hazards. This work provides a reference for reducing the losses caused by cascading hazards.

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Appendix
Available only for authorised users
Literature
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Metadata
Title
Preliminary analysis of the mechanism in the July 16, 2022 Gaojiashan cascading hazard: a landslide-induced debris flow in Southwest China
Authors
Taixin Peng
Ningsheng Chen
Martin Mergili
Runing Hou
Shufeng Tian
Publication date
01-07-2024
Publisher
Springer Berlin Heidelberg
Published in
Bulletin of Engineering Geology and the Environment / Issue 7/2024
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-024-03790-y

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