A Richards' equation-based model for wave-resolving simulation of variably-saturated beach groundwater flow dynamics - Archive ouverte HAL Access content directly
Journal Articles Journal of Hydrology Year : 2023

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

Abstract

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

hal-04009402 , version 1 (01-03-2023)

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Jean-Baptiste Clément, Damien Sous, Frédéric Bouchette, Frédéric Golay, Mehmet Ersoy. A Richards' equation-based model for wave-resolving simulation of variably-saturated beach groundwater flow dynamics. Journal of Hydrology, 2023, 619, pp.129344. ⟨10.1016/j.jhydrol.2023.129344⟩. ⟨hal-04009402⟩
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