GIS-based numerical simulation of Amamioshima debris flow in Japan

Jian WU, Guangqi CHEN, Lu ZHENG, Yingbin ZHANG

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Front. Struct. Civ. Eng. ›› 2013, Vol. 7 ›› Issue (2) : 206-214. DOI: 10.1007/s11709-013-0198-6
RESEARCH ARTICLE
RESEARCH ARTICLE

GIS-based numerical simulation of Amamioshima debris flow in 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

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Jian WU, Guangqi CHEN, Lu ZHENG, Yingbin ZHANG. GIS-based numerical simulation of Amamioshima debris flow in Japan. Front Struc Civil Eng, 2013, 7(2): 206‒214 https://doi.org/10.1007/s11709-013-0198-6

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Acknowledgements

This study has received financial support from the Global Environment Research Found of Japan (S-8), and from Grants-in-Aid for Scientific Research (Scientific Research (B), 22310113, G. Chen) from Japan Society for the Promotion of Science. And the first author acknowledges the support of China Scholarship Council. These financial supports are gratefully acknowledged.

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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