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Numerical analysis of debris flow erosion in the mountainous areas affected by the 2008 Wenchuan earthquake using a depth-averaged two-phase model

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Abstract

Channel bed erosion accompanying debris flows can significantly magnify the flowing mass and increase the associated risk. However, the mechanics of this geological phenomenon is extremely complex, which greatly increases the difficulty of predicting the dynamical behavior and bulking process of large-scale debris flows. This study employs the depth-averaged two-phase r.avaflow model to numerically analyze the flow propagation and sediment erosion processes. Two modified empirical erosion laws are further embedded in the r.avaflow framework to comparatively compute the channel erosion of a typical catastrophic debris flow occurring in Wenchuan earthquake-affected mountainous areas. The results show that both of the two erosion models can effectively reproduce the movement and channel erosion of the debris flows under investigation. In addition, the most serious sediment erosion has been found to occur along the two sides of the channels. Additionally, r.avaflow model with its simple CE-controlled erosion law relating the erosion coefficient to the slope topography is further applied to predict the dynamical behavior and bulking process of the Hongchun gully debris flow under 50- and 100-year recurrence intervals. The discharge and hazard intensity are shown to greatly increase under the effect of the typically ignored sediment erosion. This study provides more scientific basis for risk assessment and hazard mitigation for large-scale debris flows in mountainous areas.

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Funding

This work was supported by the National Natural Science Foundation of China (Grant Nos. 41807284 and 41831291).

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Authors and Affiliations

  1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai, 200092, China

    Hualin Cheng & Yu Huang

  2. Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai, 200092, China

    Yu Huang

  3. Cascade – Mountain processes and mountain hazards, Institute of Geography and Regional Science, University of Graz, Heinrichstraße 36, 8010, Graz, Austria

    Martin Mergili

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  1. Hualin Cheng
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Correspondence to Yu Huang.

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Cheng, H., Mergili, M. & Huang, Y. Numerical analysis of debris flow erosion in the mountainous areas affected by the 2008 Wenchuan earthquake using a depth-averaged two-phase model. Nat Hazards 116, 193–212 (2023). https://doi.org/10.1007/s11069-022-05669-1

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