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    Imaging Marine Fauna with a Tritech Gemini 720i Sonar

    Access Status
    Fulltext not available
    Authors
    Parsons, M.
    Fenny, E.
    Lucke, K.
    Osterrieder, S.
    Jenkins, G.
    Saunders, Ben
    Jepp, P.
    Parnum, I.
    Date
    2017
    Collection
    • Curtin Research Publications
    Type
    Journal Article
    Metadata
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    Abstract

    Multibeam sonar systems are increasingly used to detect, quantify and monitor behaviour of marine fauna. Over ranges of tens to hundreds of metres, animals can be detected as targets. However, at shorter ranges (typically <10 m) and in good conditions, high-frequency (>1 kHz) sonar systems can provide high-quality images earning the term ‘acoustic cameras’ and have become particularly advantageous for discriminating and counting fish. However, limitations of power and the significant increase in attenuation with frequency limit the achievable range of such acoustic cameras. Systems that operate at frequencies between those of mapping and fisheries sonar (typically<400 kHz) and acoustic cameras (˜1MHz) are often used for short-range navigation and to evaluate underwater structures. While these systems produce images at reduced resolution compared to acoustic cameras, they may also be capable of distinguishing features of marine fauna and do so at greater ranges. This study utilised a Tritech Gemini 720i imaging sonar to produce images from 14 species of fauna at close range. It assessed some simple morphological parameters, such as length and breadth, and highlighted the possibilities of using these to categorise targets. It also provided a coarse description of issues associated with using such a system for monitoring marine animals.

    Citation
    Parsons, M. and Fenny, E. and Lucke, K. and Osterrieder, S. and Jenkins, G. and Saunders, B. and Jepp, P. et al. 2017. Imaging Marine Fauna with a Tritech Gemini 720i Sonar. Acoustics Australia. 45 (1): pp. 41-49.
    Source Title
    Acoustics Australia
    URI
    http://hdl.handle.net/20.500.11937/50142
    DOI
    10.1007/s40857-016-0076-1
    Department
    Department of Environment and Agriculture

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