DEVELOPMENT AND APPLICATION OF GUI EQUIPPED 1-D AND 2-D DEBRIS FLOW SIMULATOR, APPLIED TO MIXED-SIZE GRAINS — IJEGE
 
 
You are here: Focus and scope Issues from 2005 to 2018 5th International Conference on Debris-Flow Hazards "Mitigation, Mechanics, Prediction and Assessment" Topic 7 - Case Studies of Debris Flows DEVELOPMENT AND APPLICATION OF GUI EQUIPPED 1-D AND 2-D DEBRIS FLOW SIMULATOR, APPLIED TO MIXED-SIZE GRAINS
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DEVELOPMENT AND APPLICATION OF GUI EQUIPPED 1-D AND 2-D DEBRIS FLOW SIMULATOR, APPLIED TO MIXED-SIZE GRAINS



Abstract:
Debris flows often cause substantial losses to human life and the economy. The amount of damage can be effectively reduced using numerical simulation models, which can describe the debris-flow process and determine the possible effects of sabo dams or erosion and sediment control dams. Although various models have been developed, many existing debris-flow numerical simulations do not have efficient graphical user interfaces (GUIs). In addition, actual debris flows are composed of mixed grain-size sediment, which causes sediment sorting, while many simulation models have been developed only for uniform-sized gravel. Here, we report the development of a GUI-equipped oneand two-dimensional (1D and 2D, respectively) debris-flow simulation system for mixed-size gravel. The model uses two layers in 1D simulations to account for debris-flow sediment sorting, and can also examine the effect of closed, slit, and grid sabo dams. The model can incorporate multiple dams and combinations of different types of sabo dams. We simulated a debris-flow disaster that occurred on September 6, 2005, in Miyajima, Hiroshima Prefecture. Although two sabo dams were present along the torrent, a large amount of damage was caused in the nearby residential area. We considered these existing dams in our simulation. Our results demonstrated that applying the mixed grain-size sediment model provided a more realistic description of the debris-flow deposition than uniformsized gravel models. Furthermore, our GUIequipped system enabled the user to input the data easily and to understand the results instinctively from the animated graphical results. Thus, the interface enables users to run high-quality debris-flow simulations easily and leads them to better solutions for sabo engineering.

Authors:
Kana Nakatani - JSPS Research Fellow, Graduate School of Agriculture, Kyoto University, Japan
Takashi Wada - Affiliation River Engineering Group, Engineering Consultants NEWJEC Inc., Japan
Naoki Matsumoto - Himekawa Sabo Office, Nagano Prefecture, Japan
Yoshifumi Satofuka - Ritsumeikan University, Dept. of Civil Engineering, Japan
Takahisa Mizuyama - Graduate School of Agriculture, Kyoto University, Japan
Keywords
Debris flow, numerical simulation, mixed-size grains, sediment sorting, two-layer model, GUI, Miyajima area.
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