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    Sound propagation in the near and far-field of a broadband echolocating dolphin and a narrowband echolocating porpoise

    76489.pdf (1.940Mb)
    Access Status
    Open access
    Authors
    Wei, Chong
    Au, Whitlow
    Ketten, Darlene
    Vishnu, Hari
    Ho, Abel Zhong Hao
    Date
    2019
    Type
    Conference Paper
    
    Metadata
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    Citation
    Wei, C. and Au, W. and Ketten, D. and Vishnu, H. and Ho, A.Z.H. 2019. Sound propagation in the near and far-field of a broadband echolocating dolphin and a narrowband echolocating porpoise, in Proceedings of the Fifth International Conference on the The Effects of Noise on Aquatic Life, Jul 7-12 2019. Den Haag, The Netherlands: Acoustical Society of America.
    Source Title
    Proceedings of Meetings on Acoustics
    Source Conference
    The Effects of Noise on Aquatic Life
    DOI
    10.1121/2.0001036
    ISSN
    1939-800X
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/76249
    Collection
    • Curtin Research Publications
    Abstract

    The echolocation signals emitted by odontocetes can be roughly classified into three broad categories: broadband high-frequency echolocation signals, narrowband high-frequency echolocation signals, and frequency modulated clicks. Previous measurements of broadband echolocation signals propagation in the bottlenose dolphin (Tursiops truncatus) did not find any evidence of focusing as the signals travel from the near to far-field. Finite element analysis (FEA) of high-resolution CT scan data was used to examine signal propagation of broadband echolocation signals of dolphins and narrowband echolocation signals of porpoises. The FEA results were used to simulate the propagation of clicks from phonic lips, traveling through the forehead, and finally transmission into the seawater. Biosonar beam formation in the near-field and far-field including the amplitude contours for the two species was determined. The finite element model was validated by finding the simulated amplitude contour in the horizontal plane was consistent with prior direct measurement results for Tursiops. Furthermore, the simulated far-field transmission beam patterns in both vertical and horizontal planes were also qualitatively consistent with results measured from live animals. This study shows that there is no evidence of convergence for either Tursiops or Phocoena as the sound propagates from near-field to far-field.

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