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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

Postal Subscription Code 80-968

2018 Impact Factor: 1.272

Front Struc Civil Eng    2013, Vol. 7 Issue (2) : 206-214    https://doi.org/10.1007/s11709-013-0198-6
RESEARCH ARTICLE
GIS-based numerical simulation of Amamioshima debris flow in Japan
Jian WU(), Guangqi CHEN, Lu ZHENG, Yingbin ZHANG
Department of Civil and Structure Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan
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Abstract

Debris flow is a rapid flow which could lead to severe flooding with catastrophic consequences such as damage to properties and loss of human lives. It is important to study the movement of debris flow. Since during a debris flow process, the erosion and deposition processes are important, the no entrainment assumption is not acceptable. In this study, first we considered the debris flow as equivalent fluid and adopted the depth-averaged govern equations to simulate the movements and evolution of river bed. Secondly, the set of partial differential equations was solved numerically by means of explicit staggered leap-frog scheme that is accurate in space and time. The grid of difference scheme was derived from GIS raster data. Then the simulation results can be displayed by GIS and easily used to form the hazard maps. Finally, the numerical model coupled with GIS is applied to simulate the debris flow occurred on Oct. 20th, 2010, in Amamioshima City, Japan. The simulation reproduces the movement, erosion and deposition. The results are shown to be consistent with the field investigation.

Keywords debris flow      numerical simulation      GIS      movement      erosion      deposition     
Corresponding Author(s): WU Jian,Email:wujiancome@sina.com   
Issue Date: 05 June 2013
 Cite this article:   
Jian WU,Guangqi CHEN,Lu ZHENG, et al. GIS-based numerical simulation of Amamioshima debris flow in Japan[J]. Front Struc Civil Eng, 2013, 7(2): 206-214.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-013-0198-6
https://academic.hep.com.cn/fsce/EN/Y2013/V7/I2/206
Fig.1  Definition of coordinate system for two dimensional governing equations
Fig.2  (a) Possible flow direction in a cell; (b) flow direction in a DEM
Fig.3  Grids and flow for debris flow computation
Fig.4  Simple flow chart of the numerical simulation coupled with GIS
Fig.5  General situation of Amamioshima debris flow (photograph modified from KKG, 2010)
ρm/(kg/m3)ρc/(kg/m3)aμβKf/(°)Δt/sΔx/mΔy/m
165025001.250.111.00.0055280.0012.52.5
Tab.1  Material properties and rheological parameters for simulation
Fig.6  Actual movement of soil and sand (photograph modified from KKG)
Fig.7  Debris flow movements and affected regions at different times. (a) 2s; (b) 30s; (c) 60s; (d) 100s; (e) 150s; (f) 220s
Fig.8  Flooded area and river bed variation of debris flow
Fig.9  Distribution of the max flow depth
Fig.10  Distribution of the max velocity
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