%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Tamborski, J.
%A Van Beek, P.
%A Rodellas, V.
%A Monnin, C.
%A Bergsma, E.
%A Stieglitz, Thomas
%A Heilbrun, C.
%A Cochran, J.K.
%A Charbonnier, C.
%A Anschutz, P.
%A Bejannin, S.
%A Beck, A.
%T Temporal variability of lagoon-sea water exchange and seawater circulation through a Mediterranean barrier beach
%D 2019
%L fdi:010088441
%G ENG
%J Limnology and Oceanography
%@ 0024-3590
%K FRANCE ; MEDITERRANEE
%K LA PALME LAGUNE
%M ISI:000485001400016
%N 5
%P 2059-2080
%R 10.1002/lno.11169
%U https://www.documentation.ird.fr/hor/fdi:010088441
%> https://www.documentation.ird.fr/intranet/publi/2023-10/010088441.pdf
%V 64
%W Horizon (IRD)
%X The subterranean flow of water through sand barriers between coastal lagoons and the sea, driven by a positive hydraulic gradient, is a net new pathway for solute transfer to the sea. On the sea side of sand barriers, sea-water circulation in the swash-zone generates a flux of recycled and new solutes. The significance and temporal variability of these vectors to the French Mediterranean Sea is unknown, despite lagoons constituting ~ 50% of the coastline. A one-dimensional 224 Raex /223 Ra reactive-transport model was used to quantify water flow between a coastal lagoon (La Palme) and the sea over a 6-month period. Horizontal flow between the lagoon and sea decreased from ~ 85 cm d-1 during May 2017 (0.3 m 3 d-1 m-1 of shoreline) to ~ 20 cm d-1 in July and was negligible in the summer months thereafter due to a decreasing hydraulic gradient. Seawater circulation in the swash-zone varied from 10 to 52 cm d-1 (0.4-2.1 m3 d-1 m-1), driven by short-term changes in the prevailing wind and wave regimes. Both flow paths supply minor dissolved silica fluxes on the order of ~ 3-10 mmol Si d-1 m-1. Lagoon-sea water exchange supplies a net dissolved inorganic carbon (DIC) flux (320-1100 mmol C d-1 m-1) two orders of magnitude greater than seawater circulation and may impact coastal ocean acidification. The subterranean flow of water through sand barriers represents a significant source of new DIC, and potentially other solutes, to the Mediterranean Sea during high lagoon water-level periods and should be considered in seasonal element budgets.
%$ 030