Numerical modelling of the run-out of a muddy debris-flow. The effect of rheology on velocity and deposit thickness along the run-out track

摘要

With a simple numerical model the effects of yield strength and pore pressure characteristics on the run-out characteristics of a small muddy debris-flow were analyzed. The muddy debris-flow was initiated in a secondary scarp of the Super-Sauze earthflow (Alpes-de-Haute-Provence, France). Assuming a purely cohesive material, model predictions of the run-out time and distance, and the uniform distribution of deposit thickness along the track were in good accordance with those measured in the field. Simulations showed that when assuming a more frictional character of the material clear concentration of material occurred at the flattening parts of the slope track.