Acoustic transmission loss measurements in queen charlotte Basin

Auteurs-es

  • Melanie E. Austin Jasco Applied Sciences, Victoria, BC, Canada
  • Alexander O. MacGillivray Jasco Applied Sciences, Victoria, BC, Canada
  • N. Ross Chapman School of Earth and Ocean Sciences, University of Victoria, Victoria, BC, Canada

Mots-clés :

Acoustic wave propagation, Forecasting, Acoustic transmission loss, Air guns, Airgun array, Bottom-mounted hydrophones, Experimental data, Mid-frequency, Model prediction, Sound level, Sound propagation, Source level, Transmission loss

Résumé

Une expérience ayant pour but de calculer les pertes de transmission acoustique a été menée au cours de l’hiver dans le sud du Détroit d’Hecate à l’aide d’un petit réseau de canons à air. Les impulsions des canons ont été mesurées par des enregistreurs posés sur le fond marin à des distances horizontales allant de 20 m à 10 km. Les valeurs de perte de transmission ont été calculées en soustrayant les niveaux sonores mesurés à la source de ceux reçus aux enregistreurs (niveaux exprimés en tiers d’octaves). Les résultats de perte de transmission obtenus ont été comparés aux prédictions d’un modèle de propagation du son utilisant l’équation parabolique. Les pertes de transmission mesurées étaient caractéristiques d’une propagation cylindrique avec une très faible contribution de termes supplémentaires non-géométriques. Il a également été trouvé que l’environnement facilitait la propagation du son en moyennes fréquences (100-400 Hz). Les prédictions issues du modèle d’équation parabolique concordaient avec les résultats expérimentaux.

Fichiers supplémentaires

Publié-e

2012-03-01

Comment citer

1.
Austin ME, MacGillivray AO, Chapman NR. Acoustic transmission loss measurements in queen charlotte Basin. Canadian Acoustics [Internet]. 1 mars 2012 [cité 2 mai 2026];40(1):27-31. Disponible à: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2503

Numéro

Vol. 40 No. 1 (2012)

Rubrique

Articles techniques

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