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dc.contributor.authorBallard, Megan S.
dc.contributor.authorLin, Ying-Tsong
dc.contributor.authorLynch, James F.
dc.date.accessioned2012-05-22T12:51:51Z
dc.date.available2012-05-22T12:51:51Z
dc.date.issued2012-04
dc.identifier.citationJournal of the Acoustical Society of America 131 (2012): 2587-2598en_US
dc.identifier.urihttp://hdl.handle.net/1912/5190
dc.descriptionAuthor 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 131 (2012): 2587-2598, doi:10.1121/1.3687446.en_US
dc.description.abstractThree-dimensional propagation effects of low frequency sound from 100 to 400 Hz caused by seafloor topography and range-dependent bottom structure over a 20 km range along the New Jersey shelf are investigated using a hybrid modeling approach. Normal modes are used in the vertical dimension, and a parabolic-equation approximate model is applied to solve the horizontal refraction equation. Examination of modal amplitudes demonstrates the effect of environmental range dependence on modes trapped in the water column, modes interacting with the bottom, and modes trapped in the bottom. Using normal mode ray tracing, topographic features responsible for three-dimensional effects of horizontal refraction and focusing are identified. These effects are observed in the measurements from the Shallow Water 2006 experiment. Specifically, signals from a pair of fixed sources recorded on a horizontal line array sitting on the seafloor show an intensification caused by horizontal focusing due to the seabed topography of 4 dB along the array.en_US
dc.description.sponsorshipWork sponsored by the Office of Naval Research under Grants No. N00014-04-1-0146, No. N00014-10-1-0040, and No. N00014-10-1-0649.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAcoustical Society of Americaen_US
dc.relation.urihttp://dx.doi.org/10.1121/1.3687446
dc.subjectAcoustic focusingen_US
dc.subjectAcoustic signal processingen_US
dc.subjectAcoustic wave refractionen_US
dc.subjectModal analysisen_US
dc.subjectRay tracingen_US
dc.subjectUnderwater acoustic propagationen_US
dc.titleHorizontal refraction of propagating sound due to seafloor scours over a range-dependent layered bottom on the New Jersey shelfen_US
dc.typeArticleen_US
dc.identifier.doi10.1121/1.3687446


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