Tide and wave driven flow across the rim reef of the atoll of Raroia (Tuamotu, French Polynesia)

Type Article
Date 2021-10
Language English
Author(s) Aucan Jerome1, Desclaux Terence2, Le Gendre RomainORCID2, Liao Vetea3, Andréfouët Serge1
Affiliation(s) 1 : Institut de Recherche Pour le Développement (IRD), UMR 9220 ENTROPIE (Institut de Recherche Pour le Développement, Université de la Réunion, IFREMER, Université de la Nouvelle-Calédonie, Centre National de la Recherche Scientifique), Nouméa, New Caledonia
2 : Institut Français de Recherche pour l'Exploitation de la MER, UMR 9220 ENTROPIE (Institut de Recherche Pour le Développement, Université de la Réunion, IFREMER, Université de la Nouvelle-Calédonie, Centre National de la Recherche Scientifique), Nouméa, New Caledonia
3 : Marine Resources Division, Government of French Polynesia, French Polynesia
Source Marine Pollution Bulletin (0025-326X) (Elsevier BV), 2021-10 , Vol. 171 , P. 112718 (10p.)
DOI 10.1016/j.marpolbul.2021.112718
WOS© Times Cited 4
Keyword(s) Pearl farming, Lagoon, Coral reef, Hydrodynamic
Abstract

The currents flowing across the rim of the atoll of Raroia were investigated with a 1 year-long dataset of wave, water level and currents. Offshore waves break on the edge of the reef outside the atoll's rim and drive current into the lagoon, through the shallow hoa that cut across the rim. The additional water volume generated by this wave driven flow induces an elevation of water level throughout the atoll's lagoon and is evacuated back into the open ocean through a deep reef pass. The water level inside the atoll is also driven by astronomical tides, which enter the lagoon thought the reef pass, after undergoing a ~50% decrease in amplitude and a ~4 hour lag. Using a simple parametric model with three calibrated coefficients, we show that currents across the atoll's rim can be estimated as a function of the offshore wave conditions and the water level difference between the ocean and the lagoon.

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