603-pp22 - How does it work? Side-scan sonar Habitat...

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1 Side-scan sonar Habitat mapping and sediment detection Geological oceanography Riikka Puntila 2.4.2008 How does it work? • Sonar uses ultrasound which needs a medium, water, to progress • Image is constructed of different reflections of different objects • Sound frequencies vary from 100-500 kHz – High frequencies give better resolution but smaller range http://woodshole.er.usgs.gov/operations/sfmapping/sonar.htm stones sand gravel rock
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2 http://pubs.usgs.gov/fs/fs039-02/fs039-02.html Side-scan as a tool • Not very usable alone – Calibration, GPS etc. • The scan results after calibration can be extrapolated in larger areas • Useful tool when grain-size analysis, photographs, transects, other acoustic systems etc. are added Cochrane and Lafferty 2002 Use of acoustic classification of sidescan sonar data for mapping benthic habitat in the Northern Channel Islands, California Purpose • To study usefulness of side-scan sonar in mapping the extension on suitable habitats for abalone and rockfish
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603-pp22 - How does it work? Side-scan sonar Habitat...

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