Research

Passive acoustic localization techniques of Eastern Pacific grey whales


Reference:

Wladichuk, J.L., Megill, W.M. and Blondel, P., 2008. Passive acoustic localization techniques of Eastern Pacific grey whales. In: 7th European Conference on Noise Control 2008, EURONOISE 2008, 2008-06-28 - 2008-07-03.

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Abstract

Eastern Pacific grey whales (Eschrichtius robustus) thrive in shallow water environments where visibility is reduced but apparently do not actively echolocate. Along their migration route and in their feeding grounds these whales are exposed to high levels of ambient noise, highly turbid waters and many underwater obstacles. To test possible passive acoustic localization mechanisms (e.g. Acoustic Daylight Imaging and Passive Synthetic Aperture), we made extensive acoustic measurements during comprehensive field studies of these whales on their summer feeding grounds in British Columbia (Canada). In combination with visual observations of the whales and their behaviours, we investigated the acoustical sources available to the whales when navigating within a feeding bay. First, we measured ambient noise levels to construct the acoustic landscape around the whales. Second, we investigated how sound is altered when objects such as kelp beds and rocks are present. We also measured acoustic changes induced by direct, controlled modifications of the near-shore environment. The aim of this research is to understand how grey whales might be finding their way around, and what impact, if any, increased levels of ambient noise might have on the whales' ability to find food and navigate within the feeding grounds.

Details

Item Type Conference or Workshop Items (Paper)
CreatorsWladichuk, J.L., Megill, W.M. and Blondel, P.
Related URLs
URLURL Type
http://www.scopus.com/inward/record.url?scp=84874817660&partnerID=8YFLogxKUNSPECIFIED
DepartmentsFaculty of Engineering & Design > Mechanical Engineering
Faculty of Science > Physics
Research Centres & Institutes > Institute for Sustainable Energy and the Environment
Research CentresCentre for Space, Atmospheric and Oceanic Science
RefereedNo
StatusPublished
ID Code35477

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