Home Home

CCAMLR

Commission for the Conservation of Antarctic Marine Living Resources

  • Home
  • Skip to Content
  • Log in

Search form

  • About CCAMLR
  • Conservation measures
  • Science
  • Fisheries
  • Compliance
  • Data
  • Meetings
  • Publications
  • Circulars
  • English
  • Français
  • Русский
  • Español
  • Home
  • Publications
  • CCAMLR Science
  • CCAMLR Science, Volume 18
  • CCAMLR Science, Volume 18 (2011):97–122

Publications

  • Basic Documents
  • Statistical Bulletin
    • Statistical Bulletin - Archive
  • CCAMLR Brochure
  • CCAMLR Science
    • Table of Contents
  • Conservation measures
    • Browse conservation measures
    • Past and present conservation measures
  • Commission reports
  • Scientific Committee reports
  • Fishery Reports
  • Fishery Reports archive
  • Fishing gear library
  • Fishing-related documents
  • Manuals
  • Posters and other promotional material
  • Scientific Abstracts
  • Order a publication
Print this page
Increase font size
Decrease font size

CCAMLR Science, Volume 18 (2011):97–122

Journal Volume:
CCAMLR Science, Volume 18
Page Numbers:
97–122
Author(s):
Calise, L. and G. Skaret
download attachmentDownload (1.46 MB)

Sensitivity investigation of the SDWBA Antarctic krill target strength model to fatness, material contrast and orientation

Abstract / Description: 

The distorted-wave Born approximation model is recognised as state-of-the-art in predicting acoustic target strength (TS) from fluid-like marine organisms. A stochastic version, the so-called SDWBA model, is endorsed by CCAMLR to predict the TS of Antarctic krill (Euphausia superba) for use in the acoustic echo-integration method. In this study, the SDWBA TS pattern and frequency response behaviours at standard survey frequencies and animal lengths are explored via a sensitivity analysis of some important parameters: number of stochastic realisations, the fatness factor, the material contrasts between the organism and the surrounding seawater and the distribution of animal orientations. Due to the high variability of TS to realistic changes in parameters, it is important that the model should be parameterised according to the potential seasonal variability of krill in the area of investigation. In a multifrequency context, the girth–length relationship for the body shape parameterisation can give a high source of uncertainty, and there is an urgent need for development of accurate and standard procedures to measure both the material property contrasts and the orientation at the time and location of the actual survey. Moreover, a number of incongruities within the CCAMLR SDWBA model package are identified and proposed solutions implemented in an improved package.

This page was last modified on 11 Jan 2013

Contact us

Email: ccamlr [at] ccamlr [dot] org
Telephone: +61 3 6210 1111
Fax: +61 3 6224 8744
Address: 181 Macquarie Street, Hobart, 7000, Tasmania, Australia

 

Quick Links

  • List of authorised vessels
  • Job vacancies
  • Schedule of Conservation Measures in Force 2024/25
  • CCAMLR Venue Hire

Recent and Upcoming Meetings

  • WG-SAM-2025
  • WG-ASAM-2025
  • WG-EMM-2025
  • Log in
  • CCAMLR e-groups
  • CCAMLR Discussions
  • Support
  • Copyright
  • Disclaimer and Privacy Policy
  • Sitemap
  • Webmail
© Copyright - the Commission for the Conservation of Antarctic Marine Living Resources 2025, All rights reserved.  |  Top of page  |  Site by Eighty Options