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    Coupled acoustic mode propagation through continental-shelf internal solitary waves

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    IEEE199700585945.pdf (431.1Kb)
    Date
    1997-04
    Author
    Preisig, James C.  Concept link
    Duda, Timothy F.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4933
    As published
    https://doi.org/10.1109/48.585945
    DOI
    10.1109/48.585945
    Keyword
     Coupled mode analysis; Underwater acoustic propagation; Underwater acoustics 
    Abstract
    Three techniques are used to investigate mode coupling as acoustic energy passes through continental-shelf internal solitary waves (ISW's). Results from all techniques agree. The waves considered here are single downward undulations of a thermocline layer separating upper and lower well-mixed layers. Two techniques are numerical: parabolic equation (PE) solution and a sudden approximation joining range-invariant regions at sharp vertical interfaces. The third technique is an analytic derivation of ISW scale lengths separating adiabatic (at large scale) and coupled-mode propagation. Results show that energy is exchanged between modes as ISW's are traversed. The sharp interface solutions help explain this in terms of spatially confined coupling and modal phase interference. Three regimes are observed: 1) for short ISW's, coupling upon wave entrance is reversed upon exit, with no net coupling; 2) for ISW scales of 75-200 m, modal phase alteration averts the exit reversal, giving net coupling; transparent resonances yielding no net coupling are also observed in this regime; and 3) for long ISW's, adiabaticity is probable but not universal. Mode refraction analysis for nonparallel acoustic-ISW alignment suggests that these two-dimensional techniques remain valid for 0° (parallel) to 65° (oblique) incidence, with an accordant ISW stretching
    Description
    Author Posting. © IEEE, 1997. This article is posted here by permission of IEEE for personal use, not for redistribution. The definitive version was published in IEEE Journal of Oceanic Engineering 22 (1997): 256-269, doi:10.1109/48.585945.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    IEEE Journal of Oceanic Engineering 22 (1997): 256-269
     

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