A dilatant two-phase debris flow model with erosion validated by full-scale field data from the Illgraben test station

We propose a dilatant, two-layer debris flow model validated by full scale density/saturation measurements obtained from the Swiss Illgraben test site. Like many existing models we suppose consists of matrix solid particles (rocks, boulders) that is surrounded muddy fluid. However, split fluid into two fractions. One part, inter-granular fluid, bonded to and fills void space between particles. The combination material forms first layer flow. second part not can move independently layer. This free During rocky particulate sheared which induces dilatant motions change solid/fluid concentration then his density. As suggested real data Illgraben, rheology used constant uniform but function composition/ compared tested on event in Ritigraben for erosion are available.