A preliminary study of the geoacoustic parameters of gassy sediment in St. Margaret's Bay, Nova Scotia

Authors

  • Marie-Noël R. Matthews Defence R and D Canada - Atlantic, P.O. Box 1012, Dartmouth, NS B2Y 3Z7, Canada
  • Francine Desharnais Defence R and D Canada - Atlantic, P.O. Box 1012, Dartmouth, NS B2Y 3Z7, Canada
  • David J. Thomson 733 Lomax Rd, Victoria, BC V9C 4A4, Canada
  • Gordon Ebbeson Defence R and D Canada - Atlantic, P.O. Box 1012, Dartmouth, NS B2Y 3Z7, Canada
  • Garry J. Heard Defence R and D Canada - Atlantic, P.O. Box 1012, Dartmouth, NS B2Y 3Z7, Canada

Keywords:

Acoustics, Correlation methods, Geophysics, Mathematical models, Parameter estimation, Gassy sediments, Geoacoustic parameters, Simulated signals

Abstract

The geoacoustic parameters of gassy sediment of St. Margert's Bay, Nova Scotia, were investigated. The geoacoustic parameters of gassy sediment such as sound speed (cs), attenuation (?s), and density were analyzed at frequencies below 500 Hz by comparing the measured and modeled transmission loss (TL) as function of range. A low-frequency underwater source was towed along a straight transit and two set of TL was measured for each hydrophone of the vertical array and simulated signal propagating over seabed models using a parabolic equations. The acoustic propagation of simulated signals were modeled for two different seabed models to calculate the TL vs range. These curves are then compared to measure TL from real underwater sources. It was observed that geoacoustic parameters of gassy layers showed correlation between real and modeled TL. Result shows that geoacoustic model for St. Margert's Bay produce TL match at frequencies below 500 Hz.

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Published

2006-12-01

How to Cite

1.
Matthews M-NR, Desharnais F, Thomson DJ, Ebbeson G, Heard GJ. A preliminary study of the geoacoustic parameters of gassy sediment in St. Margaret’s Bay, Nova Scotia. Canadian Acoustics [Internet]. 2006 Dec. 1 [cited 2021 Dec. 3];34(4):50-1. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1861

Issue

Section

Proceedings of the Acoustics Week in Canada

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