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    On whether azimuthal isotropy and alongshelf translational invariance are present in low-frequency acoustic propagation along the New Jersey shelfbreak

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    JAS001762.pdf (9.916Mb)
    Date
    2012-02
    Author
    Lynch, James F.  Concept link
    Emerson, Chris  Concept link
    Abbot, Philip A.  Concept link
    Gawarkiewicz, Glen G.  Concept link
    Newhall, Arthur E.  Concept link
    Lin, Ying-Tsong  Concept link
    Duda, Timothy F.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5078
    As published
    https://doi.org/10.1121/1.3672644
    DOI
    10.1121/1.3672644
    Keyword
     Acoustic radiators; Acoustic receivers; Acoustic variables measurement; Acoustic wave propagation; Acoustic wave transmission; Invariance; Underwater sound 
    Abstract
    To understand the issues associated with the presence (or lack) of azimuthal isotropy and horizontal (along isobath) invariance of low-frequency (center frequencies of 600 Hz and 900 Hz) acoustic propagation in a shelfbreak environment, a series of experiments were conducted under the Autonomous Wide-Aperture Cluster for Surveillance component of the Shallow Water 2006 experiment. Transmission loss data reported here were from two mobile acoustic sources executing (nearly) circular tracks transmitting to sonobuoy receivers in the circle centers, and from one 12.5 km alongshelf acoustic track. The circle radii were 7.5 km. Data are from September 8, 2006. Details of the acoustic and environmental measurements are presented. Simple analytic and computer models are used to assess the variability expected due to the ocean and seabed conditions encountered. A comparison of model results and data is made, which shows preliminary consistency between the data and the models, but also points towards further work that should be undertaken specifically in enlarging the range and frequency parameter space, and in looking at integrated transmission loss.
    Description
    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): 1762-1781, doi:10.1121/1.3672644.
    Collections
    • Physical Oceanography (PO)
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Journal of the Acoustical Society of America 131 (2012): 1762-1781
     

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