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    Estimate of the bottom compressional wave speed profile in the northeastern South China Sea using "Sources of Opportunity"

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    IEEEjoe102004Linetal.pdf (1.147Mb)
    Date
    2004-10
    Author
    Lin, Ying-Tsong  Concept link
    Lynch, James F.  Concept link
    Chotiros, Nick  Concept link
    Chen, Chi-Fang  Concept link
    Newhall, Arthur E.  Concept link
    Turgut, Altan  Concept link
    Schock, Steven G.  Concept link
    Chiu, Ching-Sang  Concept link
    Bartek, Louis R.  Concept link
    Liu, Char-Shine  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/674
    As published
    https://doi.org/10.1109/JOE.2004.834681
    DOI
    10.1109/JOE.2004.834681
    Keyword
     Broadband geoacoustic inversions; Shallow water acoustics; South China Sea 
    Abstract
    The inversion of a broad-band "source of opportunity" signal for bottom geoacoustic parameters in the northeastern South China Sea (SCS) is presented, which supplements the towed source and chirp sonar bottom inversions that were performed as part of the Asian Seas International Acoustics Experiment (ASIAEX). This source of opportunity was most likely a "dynamite fishing" signal, which has sufficient low-frequency content (5-500 Hz) to make it complimentary to the somewhat higher frequency J-15-3 towed source (50-260 Hz) signals and the much higher frequency (1-10 kHz) chirp signals. This low frequency content will penetrate deeper into the bottom, thus extending the other inverse results. Localization of the source is discussed, using both a horizontal array for azimuthal steering and the "water wave" part of the pulse arrival for distance estimation. A linear broad-band inverse is performed, and three new variants of the broad-band inverse, based on: 1) the Airy phase; 2) the cutoff frequency; and 3) a range-dependent medium are presented. A multilayer model of the bottom compressional wave speed is obtained, and error estimates for this model are shown, both for the range-independent approximation to the waveguide and for the range-dependent waveguide. Directions for future research are discussed.
    Description
    Author Posting. © IEEE, 2004. This article is posted here by permission of IEEE for personal use, not for redistribution. The definitive version was published in IEEE Journal of Oceanic Engineering 29 (2004): 1231-1248, doi:10.1109/JOE.2004.834681.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    IEEE Journal of Oceanic Engineering 29 (2004): 1231-1248
     

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