TY - JOUR
T1 - 3D numerical simulation of debris-flow motion using SPH method incorporating non-Newtonian fluid behavior
AU - Wang, Wei
AU - Chen, Guangqi
AU - Han, Zheng
AU - Zhou, Suhua
AU - Zhang, Hong
AU - Jing, Peideng
N1 - Funding Information:
We would like to thank the DualSPHysics team who developed the open-source SPH code and provided it to the public. This study has received support from Kyushu University Interdisciplinary Programs in Education and Projects in Research Development and Grant-in-Aid for challenging Exploratory Research (15K12483, G. Chen) from Japan Society for the Promotion of Science. Also, this work was supported by the Foundation of State Key Laboratory of Geo-hazard Prevention and Geo-environment Protection (SKLGP2015K008). Finally, the authors greatly appreciate the careful review and thoughtful suggestions by the anonymous reviewers.
PY - 2016/4/1
Y1 - 2016/4/1
N2 - Flow-type landslide, such as debris-flow, often exhibits high velocity and long run-out distance. Simulation on it benefits the propagation analysis and provides solution for risk assessment and mitigation design. Previous studies commonly used shallow water assumption to simulate this phenomenon, ignoring the information in vertical direction, and the Bingham model to describe constitutive law of non-Newtonian fluid can cause numerical divergence unless necessary parameter is defined. To address the issue, the full Navier–Stokes equations are adopted to describe the dynamics of the flow-type landslides. Additionally, the general Cross model is employed as the constitutive model, which ensures the numerical convergence. Rheological parameters are introduced from the Bingham model and the Mohr–Coulomb yield criterion. Subsequently, the governing equations incorporating the modified rheological model are numerically built in the smoothed particle hydrodynamics (SPH) framework and implemented into the open-source DualSPHysics code. To illustrate its performance, the 2010 Yohutagawa debris-flow event in Japan is selected as a case study. Parameters regarding the debris magnitude, i.e., the front velocity and section discharge, were also well analyzed. Simulated mass volume and deposition depth at the alluvial fan are in good agreements with the in situ observation. On the basis of the results, the developed method performs well to reproduce the debris-flow process and also benefits the analysis of flow characteristics, affected area for risk assessment and mitigation design.
AB - Flow-type landslide, such as debris-flow, often exhibits high velocity and long run-out distance. Simulation on it benefits the propagation analysis and provides solution for risk assessment and mitigation design. Previous studies commonly used shallow water assumption to simulate this phenomenon, ignoring the information in vertical direction, and the Bingham model to describe constitutive law of non-Newtonian fluid can cause numerical divergence unless necessary parameter is defined. To address the issue, the full Navier–Stokes equations are adopted to describe the dynamics of the flow-type landslides. Additionally, the general Cross model is employed as the constitutive model, which ensures the numerical convergence. Rheological parameters are introduced from the Bingham model and the Mohr–Coulomb yield criterion. Subsequently, the governing equations incorporating the modified rheological model are numerically built in the smoothed particle hydrodynamics (SPH) framework and implemented into the open-source DualSPHysics code. To illustrate its performance, the 2010 Yohutagawa debris-flow event in Japan is selected as a case study. Parameters regarding the debris magnitude, i.e., the front velocity and section discharge, were also well analyzed. Simulated mass volume and deposition depth at the alluvial fan are in good agreements with the in situ observation. On the basis of the results, the developed method performs well to reproduce the debris-flow process and also benefits the analysis of flow characteristics, affected area for risk assessment and mitigation design.
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U2 - 10.1007/s11069-016-2171-x
DO - 10.1007/s11069-016-2171-x
M3 - Article
AN - SCOPUS:84960458656
VL - 81
SP - 1981
EP - 1998
JO - Natural Hazards
JF - Natural Hazards
SN - 0921-030X
IS - 3
ER -