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Article Dans Une Revue Journal of Geophysical Research. Oceans Année : 2013

Surf zone cross-shore boundary layer velocity asymmetry and skewness: An experimental study on a mobile bed

Céline Berni
H. Michallet
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Eric Barthélemy
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Résumé

An experimental study on a physical model of a beach in a two-dimensional wave flume was designed to investigate velocity nonlinearities in the wave boundary layer. The cross-shore velocity was measured in the surf zone along a vertical profile every 3 mm from free-stream elevation down to the still bed level. The skewness and the asymmetry of the phase averaged velocity were computed at each elevation. Observations indicate that the free-stream asymmetry transforms into bottom velocity skewness. A linear experimental relation between free-stream asymmetry to skewness ratio and bottom skewness to free-stream skewness ratio is established. A theoretical linear relationship is discussed which predicts the phase lead of the bottom velocity. This phase lead is also determined by Fourier analyzing the velocity time series. The first two Fourier components yield the same phase lead at the bed which is found to be about 30 degrees and nearly constant over all the experiments made.

Dates et versions

hal-01883852 , version 1 (28-09-2018)

Identifiants

Citer

Céline Berni, H. Michallet, Eric Barthélemy. Surf zone cross-shore boundary layer velocity asymmetry and skewness: An experimental study on a mobile bed. Journal of Geophysical Research. Oceans, 2013, 118 (4), pp.2188 - 2200. ⟨10.1002/jgrc.20125⟩. ⟨hal-01883852⟩

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