WOUSSEN, Emilie; SOUS, Damien; SENECHAL, Nadia

doi:10.3390/w16131924

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WOUSSEN, Emilie
Environnements et Paléoenvironnements OCéaniques [EPOC]

SOUS, Damien
Institut méditerranéen d'océanologie [MIO]

SENECHAL, Nadia

Environnements et Paléoenvironnements OCéaniques [EPOC]

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Ce document a été publié dans

Water. 2024-07-05, vol. 16

Résumé en anglais

This study focuses on the non-hydrostatic groundwater dynamics of a meso-tidal sandy beach under the influence of tides and waves. A field campaign was conducted at Lacanau Beach, France, during four consecutive tide cycles in March 2022. Groundwater dynamics was monitored based on a network of buried pressure sensors. The data analysis revealed the combined influences of waves and tides on the groundwater circulation. Tidal-scale groundwater flows are predominantly seaward, primarily controlled by the head gradient resulting from a high coastal aquifer. A circulation cell develops under the swash zone and moves across the beachface following the tidal oscillations. On a daily scale per alongshore and vertical units, the observed flow is 2.5 m$^3$ .m$^{-2}$ .day$^{-1}$, i.e., 912.5 m$^3$.m$^{-2}$.year$^{-1}$. Extrapolating the present dataset, it may be expected that combined events, such as drought-induced aquifer depletion with high tides, could lead to beach-scale gradient reversal, potentially causing salinisation of the continental aquifer.< Réduire

Mots clés en anglais

groundwater

field data

meso-tidal sandy beach

waves and tidal dynamics

nonhydrostatic approach