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    High-frequency side-scan sonar fish reconnaissance by autonomous underwater vehicles

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    Date
    2016-05
    Author
    Grothues, Thomas  Concept link
    Newhall, Arthur E.  Concept link
    Lynch, James F.  Concept link
    Vogel, Kaela S.  Concept link
    Gawarkiewicz, Glen G.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/8891
    As published
    https://doi.org/10.1139/cjfas-2015-0301
    Abstract
    A dichotomy between depth penetration and resolution as a function of sonar frequency, draw resolution, and beam spread challenges fish target classification from sonar. Moving high-frequency sources to depth using autonomous underwater vehicles (AUVs) mitigates this and also co-locates transducers with other AUV-mounted short-range sensors to allow a holistic approach to ecological surveys. This widely available tool with a pedigree for bottom mapping is not commonly applied to fish reconnaissance and requires the development of an interpretation of pelagic reflective features, revisitation of count methods, image-processing rather than wave-form recognition for automation, and an understanding of bias. In a series of AUV mission test cases, side-scan sonar (600 and 900 kHz) returns often resolved individual school members, spacing, size, behavior, and (infrequently) species from anatomical features and could be intuitively classified by ecologists — but also produced artifacts. Fish often followed the AUV and thus were videographed, but in doing so removed themselves from the sonar aperture. AUV-supported high-frequency side-scan holds particular promise for survey of scarce, large species or for synergistic investigation of predators and their prey because the spatial scale of observations may be similar to those of predators.
    Description
    Author Posting. © The Author(s), 2016. This is the author's version of the work. It is posted here by permission of NRC Research Press for personal use, not for redistribution. The definitive version was published in Canadian Journal of Fisheries and Aquatic Sciences 74 (2017): 240-255, doi:10.1139/cjfas-2015-0301.
    Collections
    • Physical Oceanography (PO)
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Preprint: Grothues, Thomas, Newhall, Arthur E., Lynch, James F., Vogel, Kaela S., Gawarkiewicz, Glen G., "High-frequency side-scan sonar fish reconnaissance by autonomous underwater vehicles", 2016-05, https://doi.org/10.1139/cjfas-2015-0301, https://hdl.handle.net/1912/8891
     
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