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Underwater sound of rigid-hulled inflatable boats

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Open access
Authors
Erbe, Christine
Liong, S.
Koessler, Matthew Walter
Duncan, Alec
Gourlay, Tim
Date
2016
Type
Journal Article

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Erbe, C. and Liong, S. and Koessler, M.W. and Duncan, A. and Gourlay, T. 2016. Underwater sound of rigid-hulled inflatable boats. Journal of the Acoustical Society of America. 139 (6): pp. EL223-EL227.
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Journal of the Acoustical Society of America
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Centre for Marine Science and Technology
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Copyright © 2016 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.

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Abstract

Underwater sound of rigid-hulled inflatable boats was recorded 142 times in total, over 3 sites: 2 in southern British Columbia, Canada, and 1 off Western Australia. Underwater sound peaked between 70 and 400 Hz, exhibiting strong tones in this frequency range related to engine and propeller rotation. Sound propagation models were applied to compute monopole source levels, with the source assumed 1m below the sea surface. Broadband source levels (10–48 000Hz) increased from 134 to 171 dB re 1μPa @ 1m with speed from 3 to 16m/s (10–56 km/h). Source power spectral density percentile levels and 1/3 octave band levels are given for use in predictive modeling of underwater sound of these boats as part of environmental impact assessments.