Slowing deep-sea commercial vessels reduces underwater radiated noise

The Journal of the Acoustical Society of America
Alexander MacGillivrayOrla M Robinson

Abstract

During 2017, the Vancouver Fraser Port Authority's Enhancing Cetacean Habitat and Observation program carried out a two-month voluntary vessel slowdown trial to determine whether slowing to 11 knots was an effective method for reducing underwater radiated vessel noise. The trial was carried out in Haro Strait, British Columbia, in critical habitat of endangered southern resident killer whales. During the trial, vessel noise measurements were collected next to shipping lanes on two hydrophones inside the Haro Strait slowdown zone, while a third hydrophone in Strait of Georgia measured vessels noise outside the slowdown zone. Vessel movements were tracked using the automated identification system (AIS), and vessel pilots logged slowdown participation information for each transit. An automated data processing system analyzed acoustical and AIS data from the three hydrophone stations to calculate radiated noise levels and monopole source levels (SLs) of passing vessels. Comparing measurements of vessels participating in the trial with measurements from control periods before and after the trial showed that slowing down was an effective method for reducing mean broadband SLs for five categories of piloted commercial vessels: contain...Continue Reading

References

Jan 21, 2000·The Journal of the Acoustical Society of America·P T Arveson, D J Vendittis
Apr 5, 2002·The Journal of the Acoustical Society of America·Stephen C Wales, Richard M Heitmeyer
Jan 28, 2012·The Journal of the Acoustical Society of America·Megan F McKennaJohn A Hildebrand
Dec 13, 2012·The Journal of the Acoustical Society of America·Christopher BassettJim Thomson
Dec 5, 2016·The Journal of the Acoustical Society of America·Yvan SimardSamuel Giard

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Citations

May 4, 2020·The Journal of the Acoustical Society of America·Dag Tollefsen, Stan E Dosso
May 5, 2021·The Journal of the Acoustical Society of America·Samantha CopeVirgil Zetterlind
May 7, 2021·Marine Pollution Bulletin·William D HallidayStephen J Insley
Aug 2, 2021·Marine Environmental Research·Marla M HoltMichael J Ford

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