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    Three-dimensional coupled mode analysis of internal-wave acoustic ducts

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    1.4869847.pdf (2.775Mb)
    Date
    2014-05
    Author
    Shmelev, Alexey A.  Concept link
    Lynch, James F.  Concept link
    Lin, Ying-Tsong  Concept link
    Schmidt, Henrik  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6677
    As published
    https://doi.org/10.1121/1.4869847
    DOI
    10.1121/1.4869847
    Abstract
    A fully three-dimensional coupled mode approach is used in this paper to describe the physics of low frequency acoustic signals propagating through a train of internal waves at an arbitrary azimuth. A three layer model of the shallow water waveguide is employed for studying the properties of normal modes and their coupled interaction due to the presence of nonlinear internal waves. Using a robust wave number integration technique for Fourier transform computation and a direct global matrix approach, an accurate three-dimensional coupled mode full field solution is obtained for the tonal signal propagation through straight and parallel internal waves. This approach provides accurate results for arbitrary azimuth and includes the effects of backscattering. This enables one to provide an azimuthal analysis of acoustic propagation and separate the effects of mode coupled transparent resonance, horizontal reflection and refraction, the horizontal Lloyd's mirror, horizontal ducting and anti-ducting, and horizontal tunneling and secondary ducting.
    Description
    Author Posting. © Acoustical Society of America, 2014. 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 135 (2014): 2497-2512, doi:10.1121/1.4869847.
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    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Journal of the Acoustical Society of America 135 (2014): 2497-2512
     

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