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Horizontal refraction of propagating sound due to seafloor scours over a range-dependent layered bottom on the New Jersey shelf

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dc.contributor.author Ballard, Megan S.
dc.contributor.author Lin, Ying-Tsong
dc.contributor.author Lynch, James F.
dc.date.accessioned 2012-05-22T12:51:51Z
dc.date.available 2012-05-22T12:51:51Z
dc.date.issued 2012-04
dc.identifier.citation Journal of the Acoustical Society of America 131 (2012): 2587-2598 en_US
dc.identifier.uri http://hdl.handle.net/1912/5190
dc.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 131 (2012): 2587-2598, doi:10.1121/1.3687446. en_US
dc.description.abstract Three-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.sponsorship Work 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.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher Acoustical Society of America en_US
dc.relation.uri http://dx.doi.org/10.1121/1.3687446
dc.subject Acoustic focusing en_US
dc.subject Acoustic signal processing en_US
dc.subject Acoustic wave refraction en_US
dc.subject Modal analysis en_US
dc.subject Ray tracing en_US
dc.subject Underwater acoustic propagation en_US
dc.title Horizontal refraction of propagating sound due to seafloor scours over a range-dependent layered bottom on the New Jersey shelf en_US
dc.type Article en_US
dc.identifier.doi 10.1121/1.3687446


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