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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water resources and hydroinformatics : Simulation of debris-flow initiation and erosion process by a multi-phase accurate particle method
Simulation of debris-flow initiation and erosion process by a multi-phase accurate particle method
Author : TAKAAKI ABE(1), TAKESHI FUJINAMI(2) & JUNGO FUNAKI(3)
ABSTRACT
In this study, a modified particle method for modeling debris flows is proposed based on a constitutive equation
considering granular inter-particle collisional stress. The calculation method we mainly use is based on the two-phase
Moving Particle Semi-implicit (MPS) method. A modification is necessary in order to calculate highly concentrated granular
flows like debris-flows which usually exhibit dilatant properties. In this study, the granular inter-particle stress term derived
by Takahashi et al. (1997) is introduced to the momentum equations of the two-phase MPS method. The proposed
method is applied to the simulation of flume experiments of debris-flows conducted by Hirano et al. (1992). The developed
method succeeded in reproducing erosion and initiation process of the debris-flow. A quantitative comparison is made
between the velocity distributions and the experimental results for granular flow on movable bed. Velocity profiles obtained
by the proposed MPS scheme are similar to those measured by Hirano et al. (1992).
File Size : 1,100,794 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water resources and hydroinformatics
Date Published : 18/08/2015
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