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    Deep water towed array measurements at close range

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    1.4818869.pdf (19.72Mb)
    Date
    2013-10
    Author
    Heaney, Kevin D.  Concept link
    Campbell, Richard L.  Concept link
    Murray, James J.  Concept link
    Baggeroer, Arthur B.  Concept link
    Scheer, Edward K.  Concept link
    Stephen, Ralph A.  Concept link
    D'Spain, Gerald L.  Concept link
    Mercer, James A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6487
    As published
    https://doi.org/10.1121/1.4818869
    DOI
    10.1121/1.4818869
    Abstract
    During the North Pacific Acoustic Laboratory Philippine Sea 2009 experiment, towed array receptions were made from a towed source as the two ships transited from a separation of several Convergence Zones through a Closest Point of Approach at 3 km. A combination of narrowband tones and broadband pulses were transmitted covering the frequency band 79–535 Hz. The received energy arrives from two general paths—direct path and bottom bounce. Bearing-time records of the narrowband arrivals at times show a 35° spread in the angle of arrival of the bottom bounce energy. Doppler processing of the tones shows significant frequency spread of the bottom bounce energy. Two-dimensional modeling using measured bathymetry, a geoacoustic parameterization based upon the geological record, and measured sound-speed field was performed. Inclusion of the effects of seafloor roughness and surface waves shows that in-plane scattering from rough interfaces can explain much of the observed spread in the arrivals. Evidence of out-of-plane scattering does exist, however, at short ranges. The amount of out-of-plane scattering is best observed in the broadband impulse-beam response analysis, which in-plane surface roughness modeling cannot explain.
    Description
    Author Posting. © Acoustical Society of America, 2013. 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 134 (2013): 3230, doi:10.1121/1.4818869.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    • Geology and Geophysics (G&G)
    Suggested Citation
    Journal of the Acoustical Society of America 134 (2013): 3230
     
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