Inverse Analysis of Initiation Process and Disaster Range Debris Flow Based on CDEM
DOI:
https://doi.org/10.64862/Keywords:
Debris flow, Mechanical simulation, Initiation process, Deposition area, WenjiagouAbstract
The formation process of rainfall-type debris flow is a complex nonlinear process of hydraulic coupling. Based on on-site investigation and data collection, this article analyzes the formation conditions of the Wenjiagou debris flow. Based on the CDEM, the finite volume method of depth integration was used to conduct an inversion analysis of the initiation and deposition process of the "8·13" debris flow. The results show that when the friction angle is 8° and the cohesion is 50Pa, the sediment concentration reaches 15% and a debris flow initially forms one hour after the rainfall. The deposition area is basically consistent with that of the "8·13" debris flow when the comprehensive friction coefficient was 3°.
References
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Tang, C., van Asch, T. W. J., Chang, M., Chen, G. Q., Zhao, X. H., and Huang, X. C. (2012). Catastrophic debris flows on 13 August 2010 in the Qingping area, southwestern China: The combined effects of a strong earthquake and subsequent rainstorms. Geomorphology, 139–140, 559–576. https://doi.org/10.1016/j.geomorph.2011.12.021
Xu, Q. (2010). Characteristics, causes and implications of the “8·13” extra-large debris flow disaster in Sichuan Province. Journal of Engineering Geology, 18(5), 596–608.
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