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    Bottom interacting sound at 50 km range in a deep ocean environment

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    JAS002224.pdf (2.670Mb)
    Date
    2012-10
    Author
    Udovydchenkov, Ilya A.  Concept link
    Stephen, Ralph A.  Concept link
    Duda, Timothy F.  Concept link
    Bolmer, S. Thompson  Concept link
    Worcester, Peter F.  Concept link
    Dzieciuch, Matthew A.  Concept link
    Mercer, James A.  Concept link
    Andrew, Rex K.  Concept link
    Howe, Bruce M.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5462
    As published
    https://doi.org/10.1121/1.4747617
    DOI
    10.1121/1.4747617
    Keyword
     Acoustic wave reflection; Acoustic wave scattering; Acoustic wave transmission; Bathymetry; Parabolic equations; Uunderwater acoustic propagation 
    Abstract
    Data collected during the 2004 Long-range Ocean Acoustic Propagation Experiment provide absolute intensities and travel times of acoustic pulses at ranges varying from 50 to 3200 km. In this paper a subset of these data is analyzed, focusing on the effects of seafloor reflections at the shortest transmission range of approximately 50 km. At this range bottom-reflected (BR) and surface-reflected, bottom-reflected energy interferes with refracted arrivals. For a finite vertical receiving array spanning the sound channel axis, a high mode number energy in the BR arrivals aliases into low mode numbers because of the vertical spacing between hydrophones. Therefore, knowledge of the BR paths is necessary to fully understand even low mode number processes. Acoustic modeling using the parabolic equation method shows that inclusion of range-dependent bathymetry is necessary to get an acceptable model-data fit. The bottom is modeled as a fluid layer without rigidity, without three dimensional effects, and without scattering from wavelength-scale features. Nonetheless, a good model-data fit is obtained for sub-bottom properties estimated from the data.
    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 132 (2012): 2224-2231, doi:10.1121/1.4747617.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    • Geology and Geophysics (G&G)
    Suggested Citation
    Journal of the Acoustical Society of America 132 (2012): 2224-2231
     

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