Bottom loss in areas with ice-rafted sediments

Auteurs-es

  • F. Desharnais Defence Res. Establ. Atlantic, Dartmouth, NS, Canada

Mots-clés :

oceanographic regions, sea ice, sediments, underwater sound, turbidity currents, sound propagation, Arctic seas, grazing angle data, Baffin Bay, bottom losses, ice-rafted sediments, high-impedance material, North Atlantic Ocean, sediment configuration, thin layer approximation, 20 to 630 Hz, 0 to 3500 m

Résumé

Des analyses de pertes acoustiques en fonction de l’angle d'incidence rasante ont été produites pour une région dans la baie de Baffin. L'analyse a démontré que les pertes acoustiques dues au fond marin diminuent avec la fréquence, pour des fréquences allant de 20 Hz à 630 Hz. Cette caractéristique soutient l'hypothèse de la présence de sédiments déposés par les glaciers (floes), ce qui peut être modelé en ajoutant une mince couche de matériel de grande impédance à la surface des sédiments. D'autres régions de l'océan Atlantique Nord ont montré des caractéristiques semblables dans leurs courbes de pertes acoustiques dues au fond marin et dans leur configuration de sédiments. L'approximation faite avec la couche mince semble être valide pour les régions où les floes sont dominants. Les courants de turbidité peuvent vraisemblablement créer le même phénomène.

Fichiers supplémentaires

Publié-e

1991-12-01

Comment citer

1.
Desharnais F. Bottom loss in areas with ice-rafted sediments. Canadian Acoustics [Internet]. 1 déc. 1991 [cité 21 févr. 2025];19(5):11-5. Disponible à: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/700

Numéro

Vol. 19 No. 5 (1991)

Rubrique

Articles techniques

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