Internal waves generated by the wake of Gaussian hills

P. Dupont 1, 2 Y. Kadri 3 Jean-Marc Chomaz 4, *
* Auteur correspondant
1 LEGI - Laboratoire des écoulements géophysiques et industriels
2 LTI, CNRS-EPUN
3 GMEI - Groupe de Météorologie Expérimentale et Instrumentale
CNRM - Centre national de recherches météorologiques
4 LadHyX - Laboratoire d'hydrodynamique
Abstract : Depending on their structure and dynamics, the wakes of various obstacles can generate different kinds of internal waves in stratified fluids. Experiments on waves emitted by three-dimensional Gaussian models towed uniformly in a linearly stratified fluid were carried out. Beyond a critical value Frc of the Froude number Fr, the developed wake was observed to radiate an internal wave field shorter than the lee waves of the hill. The emergence of such waves is correlated with the periodic shedding of three dimensional vortical structures at Fr>Frc. Measurements show that the wavelengths of these short waves are constant in space and time, and proportional to Fr. Their phase and group velocities are proportional to the coherent structure velocity which is estimated from velocity measurements inside the wake. All those spatio-temporal characteristics prove that these short waves are generated by the displacement of the coherent structure inside the wake. © 2001 American Institute of Physics.
Type de document :
Article dans une revue
Physics of Fluids, American Institute of Physics, 2001, 13 (11), pp.3223-3233. 〈10.1063/1.1406936〉
Liste complète des métadonnées

Littérature citée [17 références]  Voir  Masquer  Télécharger
https://hal-polytechnique.archives-ouvertes.fr/hal-01025348
Contributeur : Denis Roura <>
Soumis le : jeudi 11 septembre 2014 - 13:10:28
Dernière modification le : mercredi 25 avril 2018 - 10:45:03
Document(s) archivé(s) le : vendredi 12 décembre 2014 - 10:06:20

Fichier

1.1406936.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

X-LADHYX | LEGI | UGA | X | PARISTECH | METEO

Citation

P. Dupont, Y. Kadri, Jean-Marc Chomaz. Internal waves generated by the wake of Gaussian hills. Physics of Fluids, American Institute of Physics, 2001, 13 (11), pp.3223-3233. 〈10.1063/1.1406936〉. 〈hal-01025348〉

Exporter

BibTeX TEI DC DCterms EndNote

Partager

Métriques

Consultations de la notice

446

Téléchargements de fichiers

227

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD