NASCIMENTO, Fernanda P. S.; VALLE-LEVINSON, Arnoldo; SOTTOLICHIO, Aldo; SENECHAL, Nadia

doi:10.1016/j.csr.2019.01.007

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NASCIMENTO, Fernanda P. S.

VALLE-LEVINSON, Arnoldo

SOTTOLICHIO, Aldo

Environnements et Paléoenvironnements OCéaniques [EPOC]

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Continental Shelf Research. 2019-02-15, vol. 174, p. 66-75

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Quarter-diurnal tidal constituents are linked to tidal asymmetries and play a role in the morphodynamic evolution of inlets, estuaries and lagoons. A two-year non-continuous dataset of current velocities and waves was used to improve understanding on the generation of quarter-diurnal harmonics. Data analysis provides evidence for the generation of quarter-diurnal harmonics by wind-induced waves. Data were collected at the entrance to the Arcachon Lagoon, a mixed-energy tidal inlet in Southwest France. Temporal variability of the quarter-diurnal tidal current was identified through wavelet analysis of the main velocity component (alongshore velocity). Quarter-diurnal velocity amplitudes, bottom and wave stresses, and significant wave height suggested a linkage between quarter-diurnal amplification and wave action. Both significant wave height and wave stress were coherent with quarter-diurnal current amplitudes at synoptic frequencies, most markedly in winter months of both years observed. These coherences corroborated the hypothesis that wind-induced waves enhance bottom stresses that can generate and augment quarter-diurnal currents in this region.< Réduire

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Overtide generation by wind-induced waves in a tidal inlet of SW France

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