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dc.contributor.authorParsons, Miles
dc.contributor.authorParnum, Iain
dc.contributor.authorAllen, K.
dc.contributor.authorMcCauley, Robert
dc.contributor.authorErbe, Christine
dc.identifier.citationParsons, 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.

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.

dc.publisherAustralian Acoustical Society
dc.subjectAcoustic detection
dc.subjectAcoustic waves
dc.subjectEnvironmental impact
dc.subjectAcoustic beams
dc.subjectAcoustic targets
dc.subjectDetection and identifications
dc.subjectIndustrial operations
dc.subjectAnthropogenic activity
dc.subjectMovement pattern
dc.subjectSonar imaging
dc.titleDetection of sharks with the Gemini imaging sonar
dc.typeJournal Article
dcterms.source.titleAcoustics Australia
curtin.departmentCentre for Marine Science & Technology (COE)
curtin.accessStatusFulltext not available

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