Wave-current interactions in a wave-dominated tidal inlet

Type Article
Date 2013-03
Language English
Author(s) Dodet Guillaume1, 2, Bertin Xavier2, Bruneau NicolasORCID1, 3, Fortunato Andre B.ORCID1, Nahon Alphonse1, Roland Aron4
Affiliation(s) 1 : Natl Lab Civil Engn, Estuaries & Coastal Zones Div, Lisbon, Portugal.
2 : Univ La Rochelle, UMR LIENSS 7266, Coastal & Environm Inst, La Rochelle, France.
3 : British Antarctic Survey, Cambridge CB3 0ET, England.
4 : Tech Univ Darmstadt, Inst Hydraul & Water Resources Engn, Darmstadt, Germany.
Source Journal Of Geophysical Research-oceans (2169-9275) (Amer Geophysical Union), 2013-03 , Vol. 118 , N. 3 , P. 1587-1605
DOI 10.1002/jgrc.20146
WOS© Times Cited 68
Abstract Wave-current interactions play a major role in the dynamics of shallow tidal inlets. This study investigates these interactions at a natural inlet, with a strong focus on current-induced changes on wave propagation. The analysis of hydrodynamic data collected at the Albufeira lagoon, Portugal, revealed spatiotemporal variations of water levels and wave heights along the inlet, attributed to wave-current interaction processes. We compared the simulations of a coupled wave-circulation modeling system, computed with and without waves, and propagated with and without current feedback. The wave-induced setup inside the lagoon represented 7%-15% of the offshore significant wave height. The accuracy of the wave's predictions improved when current feedback was included. During ebb, the currents increased the wave height at the mouth of the inlet (up to 20%) and decreased the wave height in the inlet (up to 40%), due to current-induced refraction, steepness dissipation, and partial blocking. During flood, the currents decreased the wave height in the inlet (up to 10%) and increased the wave height at the exterior parts of the ebb shoal (up to 10%), due to current-induced refraction. These effects significantly attenuate seaward sediment fluxes during ebb and contribute to the sediment accretion in the inlet.
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