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    Modal analysis of the range evolution of broadband wavefields in the North Pacific Ocean : low mode numbers

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    JAS004409.pdf (6.110Mb)
    Date
    2012-06
    Author
    Udovydchenkov, Ilya A.  Concept link
    Brown, Michael G.  Concept link
    Duda, Timothy F.  Concept link
    Mercer, James A.  Concept link
    Andrew, Rex K.  Concept link
    Worcester, Peter F.  Concept link
    Dzieciuch, Matthew A.  Concept link
    Howe, Bruce M.  Concept link
    Colosi, John A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5248
    As published
    https://doi.org/10.1121/1.4707431
    DOI
    10.1121/1.4707431
    Keyword
     Acoustic field; Underwater acoustic propagation 
    Abstract
    The results of mode-processing measurements of broadband acoustic wavefields made in the fall of 2004 as part of the Long-Range Ocean Acoustic Propagation Experiment (LOAPEX) in the eastern North Pacific Ocean are reported here. Transient wavefields in the 50–90 Hz band that were recorded on a 1400 -m long 40 element vertical array centered near the sound channel axis are analyzed. This array was designed to resolve low-order modes. The wavefields were excited by a ship-suspended source at seven ranges, between approximately 50 and 3200 km, from the receiving array. The range evolution of broadband modal arrival patterns corresponding to fixed mode numbers (“modal group arrivals”) is analyzed with an emphasis on the second (variance) and third (skewness) moments. A theory of modal group time spreads is described, emphasizing complexities associated with energy scattering among low-order modes. The temporal structure of measured modal group arrivals is compared to theoretical predictions and numerical simulations. Theory, simulations, and observations generally agree. In cases where disagreement is observed, the reasons for the disagreement are discussed in terms of the underlying physical processes and data limitations.
    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): 4409-4427, doi:10.1121/1.4707431.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Journal of the Acoustical Society of America 131 (2012): 4409-4427
     

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