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dc.contributor.authorRovero, Peter J.
dc.contributor.authorKeolian, Robert M.
dc.contributor.authorMiller, James H.
dc.date.accessioned2019-01-03T22:38:42Z
dc.date.available2019-01-03T22:38:42Z
dc.date.issued1994
dc.identifier.citationRovero, Peter J., Robert M. Keolian, and James H. Miller. "The influence of acoustic signals on a juvenile gray whale." The Journal of the Acoustical Society of America 96.5 (1994): 3251-3251.
dc.identifier.urihttp://hdl.handle.net/10945/60853
dc.descriptionThe article of record as published may be found at https://doi.org/10.1121/1.411065en_US
dc.description.abstractIn May 1994, a juvenile gray whale, Eschrichtius glaucus, entered the Petaluma River, which empties into the north end of San Francisco Bay, CA. The Marine Mammal Center of Sausalito, CA, coordinated a rescue and asked us to lure the whale to deeper water with sound. The Petaluma River is muddy and brackish, 20 km long, and generally 75 m wide and 3 to 4 m deep. Recorded gray whale calls and synthetic signals in the range of 100?900 Hz were broadcast with a J?9 acoustic transducer providing a source level of 153 dB re: 1 Pa at 1 m. Over several hours, the whale, who surfaced for air every 140 s, seemed to be attracted to these sounds as we traveled at a few knots down river, our sound boat typically 50 m ahead of the whale. The whale appeared to lose interest in the sound boat much beyond 100 m. A split step parabolic equation model of acoustic propagation in the river suggests that the sound level was 123 dB near the river bottom at a range of 50 m and 120 dB at 200 m. On one occasion the whale approached to within 3 m of the active source. The sound level at this distance would be about 144 dB.
dc.publisherASA
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.titleThe influence of acoustic signals on a juvenile gray whaleen_US
dc.typeArticleen_US
dc.contributor.corporateNaval Postgraduate School


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