A Richards’ equation-based model for wave-resolving simulation of variably-saturated beach groundwater flow dynamics

This study introduces a model based on Richards’ equation to describe variably-saturated beach groundwater flow. The surface wave propagation is computed by the phase-resolving non-hydrostatic SWASH code. data are used make suitable dynamic boundary condition at face force equation. latter solved weighted discontinuous Galerkin method together with adaptive mesh refinement. validated comparison laboratory experiment of transient water table recharge problem. Then, BARDEX II prototype-scale considered assess abilities for dynamics. barrier studied three cases different lagoon levels. Steady-state results no-wave conditions show excellent agreement. Transient waves simulations evaluated in terms pressure heads, saturations, position and velocities time-averaged, swash-resolving spectral analysis. Results bring interesting insights about modelling experimental as well Darcy’s equation-based model. A first investigation carried out effect bed sediment dynamics through modification relative weight.