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dc.contributor.authorLin, Ying-Tsong  Concept link
dc.contributor.authorDuda, Timothy F.  Concept link
dc.contributor.authorLynch, James F.  Concept link
dc.date.accessioned2010-05-21
dc.date.available2010-05-21
dc.date.issued2009-10
dc.identifier.citationJournal of the Acoustical Society of America 126 (2009): 1752-1765en_US
dc.identifier.urihttps://hdl.handle.net/1912/3029
dc.descriptionAuthor Posting. © Acoustical Society of America, 2009. 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 126 (2009): 1752-1765, doi:10.1121/1.3203268.en_US
dc.description.abstractHorizontal ducting of sound between short-wavelength nonlinear internal gravity waves in coastal environments has been reported in many theoretical and experimental studies. Important consequences arising at the open end of an internal wave duct (the termination) are examined in this paper with three-dimensional normal mode theory and parabolic approximation modeling. For an acoustic source located in such a duct and sufficiently far from the termination, some of the propagating sound may exit the duct by penetrating the waves at high grazing angles, but a fair amount of the sound energy is still trapped in the duct and propagates toward the termination. Analysis here shows that the across-duct sound energy distribution at the termination is unique for each acoustic vertical mode, and as a result the sound radiating from the termination of the duct forms horizontal beams that are different for each mode. In addition to narrowband analysis, a broadband simulation is made for water depths of order 80 m and propagation distances of 24 km. Situations occur with one or more modes absent in the radiated field and with mode multipath in the impulse response. These are both consistent with field observations.en_US
dc.description.sponsorshipThis work was supported under ONR Grant No. N00014-05-1-0482 and the ONR postdoctoral fellowship award, Grant No. N00014-08-1-0204.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAcoustical Society of Americaen_US
dc.relation.requireshttps://hdl.handle.net/1912/3860
dc.relation.urihttps://doi.org/10.1121/1.3203268
dc.subjectAcoustic fielden_US
dc.subjectAcoustic intensityen_US
dc.subjectApproximation theoryen_US
dc.subjectParabolic equationsen_US
dc.subjectUnderwater acoustic propagationen_US
dc.titleAcoustic mode radiation from the termination of a truncated nonlinear internal gravity wave duct in a shallow ocean areaen_US
dc.typeArticleen_US
dc.identifier.doi10.1121/1.3203268


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