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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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    JAS002587.pdf (5.444Mb)
    Date
    2012-04
    Author
    Ballard, Megan S.  Concept link
    Lin, Ying-Tsong  Concept link
    Lynch, James F.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5190
    As published
    https://doi.org/10.1121/1.3687446
    DOI
    10.1121/1.3687446
    Keyword
     Acoustic focusing; Acoustic signal processing; Acoustic wave refraction; Modal analysis; Ray tracing; Underwater acoustic propagation 
    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.
    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.
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    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Article: Ballard, Megan S., Lin, Ying-Tsong, Lynch, James F., "Horizontal refraction of propagating sound due to seafloor scours over a range-dependent layered bottom on the New Jersey shelf", Journal of the Acoustical Society of America 131 (2012): 2587-2598, DOI:10.1121/1.3687446, https://hdl.handle.net/1912/5190
     

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