A Quasi-Single-Phase Model for Debris Flows Incorporating Non-Newtonian Fluid Behavior

Debris-flow modeling is a great challenge due to its complex physical mechanism that remains poorly understood. The present research incorporates the effect of rheological features non-Newtonian fluid into complete quasi-single-phase mixture model, which explicitly accommodates interactions between flow, non-uniform sediment transport, and bed evolution. estimated by Hersch–Bulkley–Papanastasiou model can be simplified Bingham or Newtonian models with specific coefficients. governing equations are solved fully conservative numerical algorithm, using an explicit finite volume discretization well-balanced slope-limited centered scheme combined implicit method. One set large-scaled U.S. Geological Survey debris-flow experiments applied investigate influence on modeling. It found closed performs better than without considering features, may facilitate development for debris flows.