GIS-based two-dimensional numerical simulation of rainfall-induced debris flow
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, incompressibl...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2008-02-01
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| Series: | Natural Hazards and Earth System Sciences |
| Online Access: | http://www.nat-hazards-earth-syst-sci.net/8/47/2008/nhess-8-47-2008.pdf |
| _version_ | 1828259888752492544 |
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| author | C. Wang S. Li T. Esaki |
| author_facet | C. Wang S. Li T. Esaki |
| author_sort | C. Wang |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-13T03:16:44Z |
| format | Article |
| id | doaj.art-ab4055f8ba384a06b92a263bb79c49b1 |
| institution | Directory Open Access Journal |
| issn | 1561-8633 1684-9981 |
| language | English |
| last_indexed | 2024-04-13T03:16:44Z |
| publishDate | 2008-02-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Natural Hazards and Earth System Sciences |
| spelling | doaj.art-ab4055f8ba384a06b92a263bb79c49b12022-12-22T03:04:54ZengCopernicus PublicationsNatural Hazards and Earth System Sciences1561-86331684-99812008-02-01814758GIS-based two-dimensional numerical simulation of rainfall-induced debris flowC. WangS. LiT. EsakiThis 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.http://www.nat-hazards-earth-syst-sci.net/8/47/2008/nhess-8-47-2008.pdf |
| spellingShingle | C. Wang S. Li T. Esaki GIS-based two-dimensional numerical simulation of rainfall-induced debris flow Natural Hazards and Earth System Sciences |
| title | GIS-based two-dimensional numerical simulation of rainfall-induced debris flow |
| title_full | GIS-based two-dimensional numerical simulation of rainfall-induced debris flow |
| title_fullStr | GIS-based two-dimensional numerical simulation of rainfall-induced debris flow |
| title_full_unstemmed | GIS-based two-dimensional numerical simulation of rainfall-induced debris flow |
| title_short | GIS-based two-dimensional numerical simulation of rainfall-induced debris flow |
| title_sort | gis based two dimensional numerical simulation of rainfall induced debris flow |
| url | http://www.nat-hazards-earth-syst-sci.net/8/47/2008/nhess-8-47-2008.pdf |
| work_keys_str_mv | AT cwang gisbasedtwodimensionalnumericalsimulationofrainfallinduceddebrisflow AT sli gisbasedtwodimensionalnumericalsimulationofrainfallinduceddebrisflow AT tesaki gisbasedtwodimensionalnumericalsimulationofrainfallinduceddebrisflow |