Sonar-induced pressure fields in a post-mortem common dolphin

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Date
2012-02
Authors
Foote, Kenneth G.
Hastings, Mardi C.
Ketten, Darlene R.
Lin, Ying-Tsong
Reidenberg, Joy S.
Rye, Kent
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DOI
10.1121/1.3675005
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Keywords
Acoustic radiators
Acoustic receivers
Acoustic signal processing
Acoustic tomography
Acoustic transducers
Acoustic wave scattering
Acoustic wave transmission
Bioacoustics
Cellular biophysics
Computerised tomography
Ear
Lung
Muscle
Pressure gauges
Pressure measurement
Sonar
Abstract
Potential physical effects of sonar transmissions on marine mammals were investigated by measuring pressure fields induced in a 119-kg, 211-cm-long, young adult male common dolphin (Delphinus delphis) cadaver. The specimen was instrumented with tourmaline acoustic pressure gauges used as receiving sensors. Gauge implantation near critical tissues was guided by intraoperative, high-resolution, computerized tomography (CT) scanning. Instrumented structures included the melon, nares, ear, thoracic wall, lungs, epaxial muscle, and lower abdomen. The specimen was suspended from a frame equipped with a standard 50.8-mm-diameter spherical transducer used as the acoustic source and additional receiving sensors to monitor the transmitted and external, scattered field. Following immersion, the transducer transmitted pulsed sinusoidal signals at 5, 7, and 10 kHz. Quantitative internal pressure fields are reported for all cases except those in which the gauge failed or no received signal was detected. A full necropsy was performed immediately after the experiment to examine instrumented areas and all major organs. No lesions attributable to acoustic transmissions were found, consistent with the low source level and source-receiver distances.
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Author Posting. © Acoustical Society of America, 2012. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 131 (2012): 1595-1604, doi:10.1121/1.3675005.
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Journal of the Acoustical Society of America 131 (2012): 1595-1604
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