A Simplex Multi-Phase Approach for Modelling Debris Flows in Smoothed-Terrain-Following Coordinate System

Herewith we present a multi-phase model for debris flows, of which the flow body is supposed to be composed water, fine sediment (clay/silt) and grains. The rheology flows varies due dynamical variation composition concentrations. In study component silt/clay an individual phase, its concentration plays key role in determining interstitial fluid. Hence, there are three phases mixture, grain clay phase water from viewpoint mass conservation. Only fluid considered momentum conservation, since suspended relative motion negligible within constituent treated as frictional Coulomb-like continuum, viscosity depends on concentration. resultant models given smoothed-terrain-following coordinate system, compromise between constraint shallow curvature terrain-fitting system retaining high resolution topography. numerical implementation developed with CUDA-library GPU-high-performance computations. feasibility applicability will presented by back calculation historical event.