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Simulation and Calibration of Hydro-Debris 2D Model (HD2DM) to Predict the Particle Segregation Processes in Debris Flow



Author(s)

Yosuke Yamashiki1, 2, Mohd Remy Rozainy M. A. Z.3, Taku Matsumoto4, Tamotsu Takahashi5 and Kaoru Takara1

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DOI:10.17265/1934-7359/2012.06.006

1. Department of Urban and Environmental Engineering, Kyoto University, Kyoto 615-8530, Japan
2. Science and Technology Research Partnership for Sustainable Development, Tokyo 102-0076, Japan
3. School of Civil Engineering, Universiti Sains Malaysia, Penang 14300, Malaysia
4. Sumitomo Corporation, Tokyo 104-8610, Japan
5. Association for Disaster Prevention Research, Kyoto 606-8226, Japan

The principal aim of a vertical two-dimensional numerical model development is for estimating the particle tracing and mechanism of 10 mm and 2.5 mm debris. The particle tracing movement can be visually analyzed by using a high speed video camera (HSVC). A numerical model was developed using the Marker and Cell Method, which involves a Subgrid-Scale (SGS) model and the Particle Source in Cell (PSI-Cell) Method. The transportation processes of debris and air bubble were simulated in lagrangian form by introducing air bubbles and debris markers. Air bubble movement characteristics were simulated by this numerical model. Bigger particles flow at the upper part, while smaller particles attach near to the bottom. This phenomenon is similar to what we observed in the experimental studies. As a conclusion, the calibration processes for velocity was successful. The value of virtual mass (CM) was found to be one of the most important criteria that should be considered in the calibration process, as this parameter dominates fundamental characteristics of sediment particle movement in the lagrangian numerical scheme. The best fitted CM in this study was 0.35. The mean average velocity value ranging from 1.2% to 22.61% is obtained from the velocity results of numerical studies compared to the experimental studies.

Debris flow, high speed video camera (hsvc), particle routing segregation, experimental debris flow study.