Acoustic transmission loss measurements in queen charlotte Basin

Authors

  • 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

Keywords:

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

Abstract

A transmission loss experiment was carried out during the winter in south Hecate Strait using a small airgun array source. Airgun pulses were recorded at horizontal receiver ranges between 20 m and 10 km using a bottom-mounted hydrophone recorder. Transmission loss values were computed by subtracting measured source levels from received sound levels in 1/3-octave bands. Transmission loss data were compared to predictions from a parabolic-equation (PE) sound propagation model coupled with an airgun array source level model. The measured transmission loss was characteristic of cylindrical spreading, with very little additional loss attributable to non-geometric terms. Mid-frequency (100-400 Hz) sound propagation was found to be best supported by the environment. The PE model predictions showed good agreement with the experimental data.

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Published

2012-03-01

How to Cite

1.
Austin ME, MacGillivray AO, Chapman NR. Acoustic transmission loss measurements in queen charlotte Basin. Canadian Acoustics [Internet]. 2012 Mar. 1 [cited 2021 Sep. 21];40(1):27-31. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2503

Issue

Section

Technical Articles