음향자원조사를 위한 동물플랑크톤 요각류의 음향산란이론모델의 검토
Examination of Theoretical Acoustic Scattering Models for Copepods in an Acoustical Zooplankton Biomass Survey
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초록
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 30logL were <TS200kHz>= 30logL-118.4 (R2=0.716) and <TS420kHz> =30logL-108.8 (R2=0.758), respectively.
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 30logL were <TS200kHz>= 30logL-118.4 (R2=0.716) and <TS420kHz> =30logL-108.8 (R2=0.758), respectively.
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