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...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1081.4823 2023-05-15T13:41:18+02:00 Modelling three-dimensional directivity of sound scattering by Antarctic krill: progress towards biomass estimation using multibeam sonar George R Cutter Josiah S Renfree Martin J Cox Andrew S Brierley David A Demer Cutter Renfree G R J S Cox M J Brierley A S Demer D A G R Cutter J S Renfree D A Demer A M J S Cox Brierley The Pennsylvania State University CiteSeerX Archives 2009 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1081.4823 en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1081.4823 Metadata may be used without restrictions as long as the oai identifier remains attached to it. https://www.st-andrews.ac.uk/%7Eperg/Cutter_et_al_ICES_J_Mar_Sci_66_2009.pdf text 2009 ftciteseerx 2020-05-03T00:25:21Z 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. Text Antarc* Antarctic Antarctic Krill Antarctica Euphausia superba Livingston Island Unknown 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) |
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ftciteseerx |
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English |
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. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
George R Cutter Josiah S Renfree Martin J Cox Andrew S Brierley David A Demer Cutter Renfree G R J S Cox M J Brierley A S Demer D A G R Cutter J S Renfree D A Demer A M J S Cox Brierley |
spellingShingle |
George R Cutter Josiah S Renfree Martin J Cox Andrew S Brierley David A Demer Cutter Renfree G R J S Cox M J Brierley A S Demer D A G R Cutter J S Renfree D A Demer A M J S Cox Brierley Modelling three-dimensional directivity of sound scattering by Antarctic krill: progress towards biomass estimation using multibeam sonar |
author_facet |
George R Cutter Josiah S Renfree Martin J Cox Andrew S Brierley David A Demer Cutter Renfree G R J S Cox M J Brierley A S Demer D A G R Cutter J S Renfree D A Demer A M J S Cox Brierley |
author_sort |
George R Cutter |
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 |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1081.4823 |
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 |
https://www.st-andrews.ac.uk/%7Eperg/Cutter_et_al_ICES_J_Mar_Sci_66_2009.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1081.4823 |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766148699604385792 |