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    Detection of sharks with the Gemini imaging sonar

    Access Status
    Fulltext not available
    Authors
    Parsons, Miles
    Parnum, Iain
    Allen, K.
    McCauley, Robert
    Erbe, Christine
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Parsons, M. and Parnum, I. and Allen, K. and McCauley, R. and Erbe, C. 2014. Detection of sharks with the Gemini imaging sonar. Acoustics Australia. 42 (3): pp. 185-189.
    Source Title
    Acoustics Australia
    Additional URLs
    http://www.acoustics.asn.au/journal/2014/Vol42No3-Parsons.pdf
    ISSN
    0814-6039
    School
    Centre for Marine Science & Technology (COE)
    URI
    http://hdl.handle.net/20.500.11937/21670
    Collection
    • Curtin Research Publications
    Abstract

    Limiting environmental impacts of marine industrial operations and mitigating hazardous encounters between humans and marine fauna have become increasingly important as anthropogenic activity expands. To this end, significant effort has been made to develop sonar imaging of fauna and to increase detection and identification ranges. A Tritech Gemini imaging sonar was used to observe sharks of 1.4 to 2.7 m length, at ranges from 1 to 50 m, in various water depths ≤15 m. Within 5 m, shark shape, length and swimming action were readily discernible. However, as range increased, knowledge of movement patterns was required to discriminate a 'shark-like' object, before the shark became purely an acoustic target at greater ranges, where visual confirmation of the target was necessary for identification. Once the seafloor is ensonified by the acoustic beam, seafloor backscatter can dominate the image and mask shark detection. The results presented concur with other active acoustic detection studies that, for a given frequency and noise level, maximum detection and identification ranges are reliant on system source level, beam pattern, bathymetry, and target size and acoustic reflectivity.

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