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

Clément, Jean-Baptiste ; Sous, Damien ; Bouchette, Frédéric ; Golay, Frédéric ; Ersoy, Mehmet

Journal of hydrology (Amsterdam), 2023-04, Vol.619, p.129344, Article 129344 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    A Richards’ equation-based model for wave-resolving simulation of variably-saturated beach groundwater flow dynamics
  • Autor: Clément, Jean-Baptiste ; Sous, Damien ; Bouchette, Frédéric ; Golay, Frédéric ; Ersoy, Mehmet
  • Assuntos: Adaptive discontinuous Galerkin method ; Barrier beach ; Earth Sciences ; Engineering Sciences ; Fluids mechanics ; Hydrology ; Mechanics ; Numerical modelling ; Oceanography ; Sciences of the Universe ; Seepage ; Swash zone ; Unsaturated porous media
  • É parte de: Journal of hydrology (Amsterdam), 2023-04, Vol.619, p.129344, Article 129344
  • Descrição: 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 time-averaged, 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. •A Richards-based model for wave-driven variably-saturated beach groundwater dynamics.•Model validation against BARDEX II large-scale sand barrier experiments.•Detailed 2DV analysis of swash-driven groundwater flow dynamics.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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