Comparison of depth-averaged and full-3D model for the benchmarking exercise on landslide runout

Two models, with fundamental differences in their approaches, are used for modeling benchmarking exercise. The first, RASH3D, is based on a set of depth-averaged equation, solved in an Eulerian framework. The second, HYBIRD, employs a 3D Lattice-Boltzmann Model (LBM), i.e. the conservation equations are not depth-averaged and therefore multiple velocity measures are available over the depth. The model output are compared for what concerns the Yu-Tung debris flow back-analysis. Two additional cases are then analyzed using RASH3D.