Detection of sharks with the Gemini imaging sonar
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 det...
| Main Authors: | , , , , |
|---|---|
| Format: | Journal Article |
| Published: |
Australian Acoustical Society
2014
|
| Subjects: | |
| Online Access: | http://www.acoustics.asn.au/journal/2014/Vol42No3-Parsons.pdf http://hdl.handle.net/20.500.11937/21670 |
| _version_ | 1848750654850334720 |
|---|---|
| author | Parsons, Miles Parnum, Iain Allen, K. McCauley, Robert Erbe, Christine |
| author_facet | Parsons, Miles Parnum, Iain Allen, K. McCauley, Robert Erbe, Christine |
| author_sort | Parsons, Miles |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T07:40:16Z |
| format | Journal Article |
| id | curtin-20.500.11937-21670 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:40:16Z |
| publishDate | 2014 |
| publisher | Australian Acoustical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-216702017-01-30T12:26:39Z Detection of sharks with the Gemini imaging sonar Parsons, Miles Parnum, Iain Allen, K. McCauley, Robert Erbe, Christine Acoustic detection Animals Sonar Acoustics Acoustic waves Environmental impact Acoustic beams Acoustic targets Detection and identifications Industrial operations Anthropogenic activity Movement pattern Sonar imaging 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. 2014 Journal Article http://hdl.handle.net/20.500.11937/21670 http://www.acoustics.asn.au/journal/2014/Vol42No3-Parsons.pdf Australian Acoustical Society restricted |
| spellingShingle | Acoustic detection Animals Sonar Acoustics Acoustic waves Environmental impact Acoustic beams Acoustic targets Detection and identifications Industrial operations Anthropogenic activity Movement pattern Sonar imaging Parsons, Miles Parnum, Iain Allen, K. McCauley, Robert Erbe, Christine Detection of sharks with the Gemini imaging sonar |
| title | Detection of sharks with the Gemini imaging sonar |
| title_full | Detection of sharks with the Gemini imaging sonar |
| title_fullStr | Detection of sharks with the Gemini imaging sonar |
| title_full_unstemmed | Detection of sharks with the Gemini imaging sonar |
| title_short | Detection of sharks with the Gemini imaging sonar |
| title_sort | detection of sharks with the gemini imaging sonar |
| topic | Acoustic detection Animals Sonar Acoustics Acoustic waves Environmental impact Acoustic beams Acoustic targets Detection and identifications Industrial operations Anthropogenic activity Movement pattern Sonar imaging |
| url | http://www.acoustics.asn.au/journal/2014/Vol42No3-Parsons.pdf http://hdl.handle.net/20.500.11937/21670 |