Modelling three-dimensional directivity of sound scattering by Antarctic krill: progress towards biomass estimation using multibeam sonar
Target strength (TS) estimation is a principal source of uncertainty in acoustic surveys of Antarctic krill (Euphausia superba). Although TS is strongly dependent on krill orientation, there is a paucity of information in this regard. This paper considers the potential for narrow-bandwidth, multibea...
Published in: | ICES Journal of Marine Science |
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2009
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/modelling-threedimensional-directivity-of-sound-scattering-by-antarctic-krill-progress-towards-biomass-estimation-using-multibeam-sonar(6683cfa6-b8c9-4b61-afd6-a7b5de3eb593).html https://doi.org/10.1093/icesjms/fsp040 http://www.scopus.com/inward/record.url?scp=77949658209&partnerID=8YFLogxK |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/6683cfa6-b8c9-4b61-afd6-a7b5de3eb593 2024-06-23T07:47:57+00:00 Modelling three-dimensional directivity of sound scattering by Antarctic krill: progress towards biomass estimation using multibeam sonar Cutter, George R. Renfree, Josiah S. Cox, Martin J. Brierley, Andrew Stuart Demer, David A. 2009-07 https://research-portal.st-andrews.ac.uk/en/researchoutput/modelling-threedimensional-directivity-of-sound-scattering-by-antarctic-krill-progress-towards-biomass-estimation-using-multibeam-sonar(6683cfa6-b8c9-4b61-afd6-a7b5de3eb593).html https://doi.org/10.1093/icesjms/fsp040 http://www.scopus.com/inward/record.url?scp=77949658209&partnerID=8YFLogxK eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/modelling-threedimensional-directivity-of-sound-scattering-by-antarctic-krill-progress-towards-biomass-estimation-using-multibeam-sonar(6683cfa6-b8c9-4b61-afd6-a7b5de3eb593).html info:eu-repo/semantics/restrictedAccess Cutter , G R , Renfree , J S , Cox , M J , Brierley , A S & Demer , D A 2009 , ' Modelling three-dimensional directivity of sound scattering by Antarctic krill: progress towards biomass estimation using multibeam sonar ' , ICES Journal of Marine Science , vol. 66 , no. 6 , pp. 1245-1251 . https://doi.org/10.1093/icesjms/fsp040 Antarctic krill directivity incidence angle multibeam sonar orientation target strength TARGET STRENGTH MEASUREMENTS WAVE BORN APPROXIMATION IMPROVED PARAMETERIZATION ACOUSTIC SCATTERING BROAD-BANDWIDTH FISH SCHOOLS 120 KHZ BEHAVIOR AVOIDANCE article 2009 ftunstandrewcris https://doi.org/10.1093/icesjms/fsp040 2024-06-13T00:28:13Z Target strength (TS) estimation is a principal source of uncertainty in acoustic surveys of Antarctic krill (Euphausia superba). Although TS is strongly dependent on krill orientation, there is a paucity of information in this regard. This paper considers the potential for narrow-bandwidth, multibeam-echosounder (MBE) data to be used for estimating the orientations of krill beneath survey vessels. First, software was developed to predict MBE measurements of the directivity patterns of acoustic scattering from individual or aggregated krill in any orientation. Based on the distorted-wave, Born approximation model (DWBA), scattering intensities are predicted vs. MBE angles for specified distributions of krill orientations (pitch, roll, and yaw angles) and swarm densities. Results indicate that certain distributions of orientations, perhaps indicative of particular behaviour, should be apparent from the sonar data. The model results are compared with measurements on krill made using a 200-kHz MBE deployed from a small craft off Cape Shirreff, Livingston Island, Antarctica, in summer 2006. The stochastic DWBA model is then invoked to explain disparities between the model predictions and MBE measurements. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctica Euphausia superba Livingston Island University of St Andrews: Research Portal Antarctic Cape Shirreff ENVELOPE(-60.800,-60.800,-62.417,-62.417) Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) Shirreff ENVELOPE(-60.792,-60.792,-62.459,-62.459) ICES Journal of Marine Science 66 6 1245 1251 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Antarctic krill directivity incidence angle multibeam sonar orientation target strength TARGET STRENGTH MEASUREMENTS WAVE BORN APPROXIMATION IMPROVED PARAMETERIZATION ACOUSTIC SCATTERING BROAD-BANDWIDTH FISH SCHOOLS 120 KHZ BEHAVIOR AVOIDANCE |
spellingShingle |
Antarctic krill directivity incidence angle multibeam sonar orientation target strength TARGET STRENGTH MEASUREMENTS WAVE BORN APPROXIMATION IMPROVED PARAMETERIZATION ACOUSTIC SCATTERING BROAD-BANDWIDTH FISH SCHOOLS 120 KHZ BEHAVIOR AVOIDANCE Cutter, George R. Renfree, Josiah S. Cox, Martin J. Brierley, Andrew Stuart Demer, David A. Modelling three-dimensional directivity of sound scattering by Antarctic krill: progress towards biomass estimation using multibeam sonar |
topic_facet |
Antarctic krill directivity incidence angle multibeam sonar orientation target strength TARGET STRENGTH MEASUREMENTS WAVE BORN APPROXIMATION IMPROVED PARAMETERIZATION ACOUSTIC SCATTERING BROAD-BANDWIDTH FISH SCHOOLS 120 KHZ BEHAVIOR AVOIDANCE |
description |
Target strength (TS) estimation is a principal source of uncertainty in acoustic surveys of Antarctic krill (Euphausia superba). Although TS is strongly dependent on krill orientation, there is a paucity of information in this regard. This paper considers the potential for narrow-bandwidth, multibeam-echosounder (MBE) data to be used for estimating the orientations of krill beneath survey vessels. First, software was developed to predict MBE measurements of the directivity patterns of acoustic scattering from individual or aggregated krill in any orientation. Based on the distorted-wave, Born approximation model (DWBA), scattering intensities are predicted vs. MBE angles for specified distributions of krill orientations (pitch, roll, and yaw angles) and swarm densities. Results indicate that certain distributions of orientations, perhaps indicative of particular behaviour, should be apparent from the sonar data. The model results are compared with measurements on krill made using a 200-kHz MBE deployed from a small craft off Cape Shirreff, Livingston Island, Antarctica, in summer 2006. The stochastic DWBA model is then invoked to explain disparities between the model predictions and MBE measurements. |
format |
Article in Journal/Newspaper |
author |
Cutter, George R. Renfree, Josiah S. Cox, Martin J. Brierley, Andrew Stuart Demer, David A. |
author_facet |
Cutter, George R. Renfree, Josiah S. Cox, Martin J. Brierley, Andrew Stuart Demer, David A. |
author_sort |
Cutter, George R. |
title |
Modelling three-dimensional directivity of sound scattering by Antarctic krill: progress towards biomass estimation using multibeam sonar |
title_short |
Modelling three-dimensional directivity of sound scattering by Antarctic krill: progress towards biomass estimation using multibeam sonar |
title_full |
Modelling three-dimensional directivity of sound scattering by Antarctic krill: progress towards biomass estimation using multibeam sonar |
title_fullStr |
Modelling three-dimensional directivity of sound scattering by Antarctic krill: progress towards biomass estimation using multibeam sonar |
title_full_unstemmed |
Modelling three-dimensional directivity of sound scattering by Antarctic krill: progress towards biomass estimation using multibeam sonar |
title_sort |
modelling three-dimensional directivity of sound scattering by antarctic krill: progress towards biomass estimation using multibeam sonar |
publishDate |
2009 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/modelling-threedimensional-directivity-of-sound-scattering-by-antarctic-krill-progress-towards-biomass-estimation-using-multibeam-sonar(6683cfa6-b8c9-4b61-afd6-a7b5de3eb593).html https://doi.org/10.1093/icesjms/fsp040 http://www.scopus.com/inward/record.url?scp=77949658209&partnerID=8YFLogxK |
long_lat |
ENVELOPE(-60.800,-60.800,-62.417,-62.417) ENVELOPE(-60.500,-60.500,-62.600,-62.600) ENVELOPE(-60.792,-60.792,-62.459,-62.459) |
geographic |
Antarctic Cape Shirreff Livingston Island Shirreff |
geographic_facet |
Antarctic Cape Shirreff Livingston Island Shirreff |
genre |
Antarc* Antarctic Antarctic Krill Antarctica Euphausia superba Livingston Island |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctica Euphausia superba Livingston Island |
op_source |
Cutter , G R , Renfree , J S , Cox , M J , Brierley , A S & Demer , D A 2009 , ' Modelling three-dimensional directivity of sound scattering by Antarctic krill: progress towards biomass estimation using multibeam sonar ' , ICES Journal of Marine Science , vol. 66 , no. 6 , pp. 1245-1251 . https://doi.org/10.1093/icesjms/fsp040 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/modelling-threedimensional-directivity-of-sound-scattering-by-antarctic-krill-progress-towards-biomass-estimation-using-multibeam-sonar(6683cfa6-b8c9-4b61-afd6-a7b5de3eb593).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1093/icesjms/fsp040 |
container_title |
ICES Journal of Marine Science |
container_volume |
66 |
container_issue |
6 |
container_start_page |
1245 |
op_container_end_page |
1251 |
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1802638249482518528 |