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Two-dimensional Dynamics Simulation of Two-phase Debris Flow
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Two-dimensional Dynamics Simulation of Two-phase Debris Flow
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  • LIU Wei

    LIU Wei

    1 Key laboratory of Mountain Hazards and Surface Process, Chinese Academy of Science, Chengdu 610041, China 2 Institute of Mountain Hazards and Environment (IMHE), Chinese Academy of Sciences, Chengdu 610041, China
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  • HE Siming

    HE Siming

    1 Key laboratory of Mountain Hazards and Surface Process, Chinese Academy of Science, Chengdu 610041, China 2 Institute of Mountain Hazards and Environment (IMHE), Chinese Academy of Sciences, Chengdu 610041, China 3 Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China
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  • OUYANG Chaojun

    OUYANG Chaojun

    1 Key laboratory of Mountain Hazards and Surface Process, Chinese Academy of Science, Chengdu 610041, China 2 Institute of Mountain Hazards and Environment (IMHE), Chinese Academy of Sciences, Chengdu 610041, China 3 Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China
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Fund Project:

Financial support from the NSFC-ICIMOD (41661144041), NSFC (Grant No. 41772312), Key Research and Development Program (2017SZ0041), and Sichuan Province Science and Technology Support Project (2016SZ0067) is acknowledged.

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    摘要:

    Abstract:

    To investigate the movement?mechanism?of debris flow,?a two-dimensional, two-phase, depth-integrated model is introduced. The model uses Mohr-Coulomb plasticity for the solid rheology, and the fluid stress is modeled as a Newtonian fluid. The interaction between solid and liquid phases, which plays a major role in debris flow movement, is assumed to consist of drag and buoyancy forces. The applicability of drag force formulas is discussed. Considering the complex interaction between debris flow and the bed surface, a combined friction boundary condition is imposed on the bottom, and this is also discussed. To solve the complex model equations, a numerical method with second-order accuracy based on the finite volume method is proposed. Several numerical experiments are performed to verify the feasibilities?of model and numerical schemes. Numerical results demonstrate that different solid volume fractions substantially affect debris flow movement.

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LIU Wei, HE Siming, OUYANG Chaojun.2017. Two-dimensional Dynamics Simulation of Two-phase Debris Flow[J]. ACTA GEOLOGICA SINICA(English edition),91(5):1873~1883

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历史
  • 收稿日期:2016-02-15
  • 最后修改日期:2016-08-10
  • 在线发布日期: 2017-10-23
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