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...

Full description

Bibliographic Details
Published in:ICES Journal of Marine Science
Main Authors: Cutter, George R., Renfree, Josiah S., Cox, Martin J., Brierley, Andrew Stuart, Demer, David A.
Format: Article in Journal/Newspaper
Language:English
Published: 2009
Subjects:
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
Antarctic
Cape Shirreff
Livingston Island
Shirreff
Antarc*
Antarctic Krill
Antarctica
Euphausia superba
Online Access:https://risweb.st-andrews.ac.uk/portal/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
Description
Summary: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.

Similar Items