Modelling landslide generated waves using the discontinuous finite element method

A new two-layer model for impulsive wave generation by deformable granular landslides is developed based upon a discontinuous Galerkin finite element discretisation. Landslide motion modelled using depth-averaged formulation shallow subaerial debris flow, which considers the bed curvature represented local slope angle variable and accounts inter-granular stresses Coulomb friction. Wave propagation are simulated with three-dimensional non-hydrostatic coastal ocean Thetis to accurately capture key features such as dispersion. Two different techniques used in treating wetting drying (WD) processes during landslide displacement generation, respectively. For lower-layer across dry classical thin-layer explicit WD method implemented, while resulting free-surface waves interacted moving an implicit scheme utilised naturally circumvent artificial pressure gradient problem may appear dynamic interaction between water if method. The validated suite of test cases, good agreement demonstrating its capability describing both complex behaviours from initiation deposition, consequent propagation.