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Observations of Tide- and Wave-Driven Groundwater Dynamics in Meso-Tidal Sandy Beach

Emilie Woussen / Damien Sous / Nadia Sénéchal

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.

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Observations of Tide- and Wave-Driven Groundwater Dynamics in Meso-Tidal Sandy Beach

Emilie Woussen / Damien Sous / Nadia Sénéchal

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.

Observations of Tide- and Wave-Driven Groundwater Dynamics in Meso-Tidal Sandy Beach

Emilie Woussen / Damien Sous / Nadia Sénéchal

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.

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Title:

Observations of Tide- and Wave-Driven Groundwater Dynamics in Meso-Tidal Sandy Beach

Contributors:

Emilie Woussen (author) / Damien Sous (author) / Nadia Sénéchal (author)

Published in:

Water, Vol 16, Iss 13, p 1924 (2024)

Publication date:

2024

ISSN:

DOI:

https://doi.org/10.3390/w16131924

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

Unknown

Keywords:

groundwater , field data , meso-tidal sandy beach , waves and tidal dynamics , non-hydrostatic approach , Hydraulic engineering , TC1-978 , Water supply for domestic and industrial purposes , TD201-500

Metadata by DOAJ is licensed under CC BY-SA 1.0

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