GIS-based two-dimensional numerical simulation of debris flow

Chun Xiang Wang, Shi Wei Bai, Tetsuro Esaki, Yasuhiro Mitani

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

To predict the ran out distance and extent of the hazard area of rainfall-induced debris flows, we proposed a depth-averaged two-dimensional numerical model, in which the debris and water mixture is assumed to be a uniform continuous, incompressible, unsteady Newtonian turbulence fluid. As raster grid networks of digital elevation model in 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 data and output are processed in GIS. The model is applied to simulate the rainfall-induced real debris flow of July 20, 2003, in Minamata City of southern Kyushu, Japan. The simulation reproduces the propagation of the real debris flow; and the results are in good agreement with the field investigation. The two-dimensional numerical simulation using GIS can be used to estimate the potentially inundated areas, the potentially dangerous homes and roads for hazard and risk analysis.

Original languageEnglish
JournalYantu Lixue/Rock and Soil Mechanics
Volume28
Issue number7
Publication statusPublished - Jul 2007

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology
  • Soil Science

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