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| Titel |
GIS-based two-dimensional numerical simulation of rainfall-induced debris flow |
| VerfasserIn |
C. Wang, S. Li, T. Esaki |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 8, no. 1 ; Nr. 8, no. 1 (2008-02-04), S.47-58 |
| Datensatznummer |
250005320
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| Publikation (Nr.) |
 copernicus.org/nhess-8-47-2008.pdf |
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| Zusammenfassung |
| This paper aims to present a useful numerical method to simulate the
propagation and deposition of debris flow across the three dimensional
complex terrain. A depth-averaged two-dimensional numerical model is
developed, in which the debris and water mixture is assumed to be
continuous, incompressible, unsteady flow. The model is based on the
continuity equations and Navier-Stokes equations. Raster grid networks of
digital elevation model in GIS provide a uniform grid system to describe
complex topography. As the raster grid can be used as the finite difference
mesh, the continuity and momentum equations are solved numerically using the
finite difference method. The numerical model is applied to simulate the
rainfall-induced debris flow occurred in 20 July 2003, in Minamata City of
southern Kyushu, Japan. The simulation reproduces the propagation and
deposition and the results are in good agreement with the field
investigation. The synthesis of numerical method and GIS makes possible the
solution of debris flow over a realistic terrain, and can be used to
estimate the flow range, and to define potentially hazardous areas for homes
and road section. |
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