Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Examination of Theoretical Acoustic Scattering Models for Copepods in an Acoustical Zooplankton Biomass Survey

음향자원조사를 위한 동물플랑크톤 요각류의 음향산란이론모델의 검토

  • Hwang, Bo-Kyu (Research Center for Ocean Industry Development, Pukyong National University) ;
  • Shin, Hyeon-Ok (Division of Marine Production System Management, Pukyong National University) ;
  • Lee, Dae-Jae (Division of Marine Production System Management, Pukyong National University) ;
  • Lee, You-Won (Division of Marine Production System Management, Pukyong National University)
  • 황보규 (부경대학교 해양산업개발연구소) ;
  • 신현옥 (부경대학교 해양생산시스템관리학부) ;
  • 이대재 (부경대학교 해양생산시스템관리학부) ;
  • 이유원 (부경대학교 해양생산시스템관리학부)
  • Received : 2010.06.04
  • Accepted : 2010.08.16
  • Published : 2010.08.31
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Abstract

Several theoretical acoustic scattering models were applied to estimate the target strength (TS) for assessing the biomass of zooplankton, to overcome the difficulty of direct measurements. Acoustical scattering characteristics of copepods were estimated using three theoretical models, and the application of the models was evaluated for four frequencies of a scientific echo sounder. The scattering directivity by the body shapes of copepods at 200 kHz and 420 kHz was significantly affected by TS patterns. Averaged TS, however, were similar at higher frequencies. Consequently, a low frequency model, such as a truncated fluid sphere model, provides a good acoustical biomass estimation. The regressions of TS and 30 logL were < $TS_{200\;kHz}$ >= 30logL-118.4 ($R^2=0.716$) and < $TS_{420 kHz}$ > =30 logL-108.8 ($R^2=0.758$), respectively.

Keywords

References

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