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    Enhanced acoustic mode coupling resulting from an internal solitary wave approaching the shelfbreak in the South China Sea

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    JAS001306.pdf (3.949Mb)
    Date
    2013-03
    Author
    Chiu, Linus Y. S.  Concept link
    Reeder, D. Benjamin  Concept link
    Chang, Yuan-Ying  Concept link
    Chen, Chi-Fang  Concept link
    Chiu, Ching-Sang  Concept link
    Lynch, James F.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6019
    As published
    https://doi.org/10.1121/1.4789358
    DOI
    10.1121/1.4789358
    Keyword
     Acoustic intensity; Acoustic wave scattering; Bathymetry; Ocean waves; Solitons; Underwater acoustic propagation 
    Abstract
    Internal waves and bathymetric variation create time- and space-dependent alterations in the ocean acoustic waveguide, and cause subsequent coupling of acoustic energy between propagating normal modes. In this paper, the criterion for adiabatic invariance is extended to the case of an internal solitary wave (ISW) encountering a sloping bathymetry (i.e., continental shelfbreak). Predictions based on the extended criterion for adiabatic invariance are compared to experimental observations from the Asian Seas International Acoustics Experiment. Using a mode 1 starter field, results demonstrate time-dependent coupling of mode 1 energy to higher adjacent modes, followed by abrupt coupling of mode 5–7 energy to nonadjacent modes 8–20, produces enhanced mode coupling and higher received levels downrange of the oceanographic and bathymetric features. Numerical simulations demonstrate that increasing ISW amplitude and seafloor slope enhance the coupling of energy to adjacent and nonadjacent modes. This enhanced coupling is the direct result of the simultaneous influence of the ISW and its proximity to the shelfbreak, and, compared to the individual effect of the ISW or shelfbreak, has the capacity to scatter 2–4 times the amount of acoustic energy from below the thermocline into the upper water column beyond the shelfbreak in realistic environments.
    Description
    Author Posting. © Acoustical Society of America, 2013. 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 133 (2013): 1306-1319, doi:10.1121/1.4789358.
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    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Journal of the Acoustical Society of America 133 (2013): 1306-1319
     

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