Horizon / Plein textes La base de ressources documentaires de l'IRD

IRD

 

Publications des scientifiques de l'IRD

Leckler F., Ardhuin Fabrice, Peureux C., Benetazzo A., Bergamasco F., Dulov V. (2015). Analysis and interpretation of frequency-wavenumber spectra of young wind waves. Journal of Physical Oceanography, 45 (10), 2484-2496. ISSN 0022-3670

Lien direct chez l'éditeur doi:10.1175/jpo-d-14-0237.1

Titre
Analysis and interpretation of frequency-wavenumber spectra of young wind waves
Année de publication2015
Type de documentArticle référencé dans le Web of Science WOS:000362415900003
AuteursLeckler F., Ardhuin Fabrice, Peureux C., Benetazzo A., Bergamasco F., Dulov V.
SourceJournal of Physical Oceanography, 2015, 45 (10), p. 2484-2496. ISSN 0022-3670
RésuméThe energy level and its directional distribution are key observations for understanding the energy balance in the wind-wave spectrum between wind-wave generation, nonlinear interactions, and dissipation. Here, properties of gravity waves are investigated from a fixed platform in the Black Sea, equipped with a stereo video system that resolves waves with frequency f up to 1.4 Hz and wavelengths from 0.6 to 11 m. One representative record is analyzed, corresponding to young wind waves with a peak frequency f(p) = 0.33 Hz and a wind speed of 13 m s(-1). These measurements allow for a separation of the linear waves from the bound second-order harmonics. These harmonics are negligible for frequencies f up to 3 times f(p) but account for most of the energy at higher frequencies. The full spectrum is well described by a combination of linear components and the second-order spectrum. In the range 2f(p) to 4f(p), the full frequency spectrum decays like f(-5), which means a steeper decay of the linear spectrum. The directional spectrum exhibits a very pronounced bimodal distribution, with two peaks on either side of the wind direction, separated by 150 degrees at 4f(p). This large separation is associated with a significant amount of energy traveling in opposite directions and thus sources of underwater acoustic and seismic noise. The magnitude of these sources can be quantified by the overlap integral I(f), which is found to increase sharply from less than 0.01 at f = 2f(p) to 0.11 at f = 4f(p) and possibly up to 0.2 at f = 5f(p), close to the 0.5 value proposed in previous studies.
Plan de classementLimnologie physique / Océanographie physique [032] ; Télédétection [126]
Descr. géo.MER NOIRE
LocalisationFonds IRD
Identifiant IRDPAR00013853
Lien permanenthttp://www.documentation.ird.fr/hor/PAR00013853

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL


Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation

Bondy

Montpellier (centre IRD)

Montpellier (MSE)

Cayenne

Nouméa

Papeete

Abidjan

Dakar

Niamey

Ouagadougou

Tunis

La Paz

Quito