남극 남쉐틀랜드 군도 주변 해저면 음향신호를 이용한 상업용 어군탐지기 보정 연구
A study on calibration for commercial split beam echosounder using the bottom backscattering strength from a fishing vessel near the South Shetland Islands, Antarctica
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초록
본 연구는 남극 크릴(Antarctic krill, Euphausia superba)에 대한 자원 조사의 활용을 위해서 크릴 조업선 내 상업어탐(ES70)에 대한 보정을 실시하였다. 보정 방법은 상업어탐(ES70)과 보정된 과학어탐(EK60)으로 CCAMLR (Commission for the Conservation of Antarctic Marine Living Resources)에서 지정한 남쉐틀랜드 군도 (South Shetland Islands) 인근해역의 동일한 음향 정선에서 획득한 해저면 신호의 차이를 이용하였다. 보정을 위해서 사용한 주파수는 38 kHz와 120 kHz 이고, 보정 여부를 검증을 위해 다중 주파수로 획득한 크릴 군체 신호의 레벨 차이를 확인하였다. 분석 결과 38 kHz와 120 kHz에 대한 크릴의 신호 차이인 2 dB < SV120kHz‒38 kHz < 12 dB 범위 내에 크릴 군체의 신호가 ES70의 보정 전과 후 각각26.95 % 와92.04 % 가 포함되어 해저면 신호를 통한 보정의 가능성을 확인하였다.
Abstract
Commercial split beam echosounder (ES70) installed on a krill fishing vessel was calibrated in order to utilize it in estimating biomass of Antarctic krill (Euphausia superba). The method of calibration was to analyze the difference between the bottom backscattering strength of the commercial split beam echosounder (i.e. ES70) and the scientific echosounder (i.e. EK60) at one of transects near South Shetland Islands designated by CCAMLR. 38 kHz and 120 kHz were used for the calibration, and krill swarm signal levels, obtained from multi frequencies, was examined to verify the calibration result. The analysis result indicated possibility of calibration by bottom backscattering strength, since the proportion of krill swarm signals within 2 dB < SV 120 kHz-38 kHz < 12 dB (i.e. a common SV 120 kHz-38 kHz range of 38 kHz and 120 kHz to be an indicator of Antarctic krill) over the total acoustic signals were 26.95% and 92.04%, respectively before and after the calibration.
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