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SDWBA 모델을 이용한 남극 크릴과 아이스 크릴의 반사강도 연구

Target strength of Antarctic krill and ice krill using the SDWBA model

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참고문헌

키워드

주제분류수산학

초록

본 연구에서는 SDWBA 모델을 이용하여 남극해 우점 크릴종인 남극 크릴과 아이스 크릴의 음향산란특성을 파악하였다. 크릴의 표적 강도에 영향을 미치는 크릴의 체내 음속비, 밀도비, 비만도, 그리고 자세각 분포를 변화시켜 가며 주파수별 크릴 길이별 표적강도 변화를 확인하였다. 모의 결과, 크릴의 표적 강도는 자세각 분포와 비만도에 의해서 큰 변화가 나타났으며 체내 음속비와 밀도비 변화에 따른 표적 강도 변화에 상대적으로 작게 확인되었다. 본 연구 결과는 남극해의 주요 생물인 남극 크릴과 아이스 크릴의 음향산란특성을 이해하는데 도움을 줄 수 있으며, 더 나아가 두 크릴 종의 음향신호 분리 및 이들의 현존량 추정에 활용될 수 있을 것으로 기대한다.

Abstract

We explored the frequency response of krill target strength (TS) to understand the Antarctic krill (Euphausia superba) and ice krill (Euphausia crystallorophias) using the stochastic distorted-wave Born approximation (SDWBA) model. The results showed that the distribution of orientation and the fatness factor could significantly impact on the frequency response of TS. Krill TS is clearly depended on acoustic properties, which could affect to estimate the biomass of two krill species. The results provide insight into the importance of understanding TS variation to estimate the Antarctic krill and ice krill biomass, and their ecology related to the environmental features in the Southern Ocean.

참고문헌 (24)

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