Two-dimensional numerical simulation of rainfall-induced debris flows using GIS
To predict the runout distance and inundated area of rainfall-induced debris flows, we develop a depth-averaged two-dimensional numerical model, in which the debris and water mixture is assumed to be a continuous, incompressible, unsteady fluid. The model is based on the continuity equations and Navier-Stokes equations. As raster grid networks of digital elevation model in Geographic Information Systems (GIS) can be used as the finite difference mesh, the continuity and momentum equations are solved numerically using the finite difference method. All the input and output data are processed in GIS. The model is applied to simulate the rainfall-induced debris flow of July 20, 2003, in Minamata City, southern Kyushu, Japan. The simulation reproduces the propagation and deposition of the debris flow and the results are in good agreement with field investigations. The two-dimensional numerical simulation of rainfall-induced debris flows using GIS can be used to estimate the flow range, and to define potentially hazardous areas for homes and roads.
two-dimensional numerical simulation debris flow rainfall-induced Geographic Information Systems
C.X. Wang T. Esaki Y. Mitani J. Andou
Institute of Environmental Systems, Kyushu University, Japan Kawasaki Geological Engineering Co. Ltd., Japan
国际会议
成都
英文
209-219
2007-05-17（万方平台首次上网日期，不代表论文的发表时间）