Acoustic transmission loss measurements in queen charlotte Basin


  • 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


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


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.




How to Cite

Austin ME, MacGillivray AO, Chapman NR. Acoustic transmission loss measurements in queen charlotte Basin. Canadian Acoustics [Internet]. 2012 Mar. 1 [cited 2022 Oct. 3];40(1):27-31. Available from:



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