한국연안에 있는 보름달물해파리의 체내 음속과 밀도 평가
An estimation of the sound-speed and density of moon jellyfish (Aurelia aurita) in Korean waters
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초록
연구에서는 음향 모델을 이용하여 보름달물해파리의 TS를 평가하기 위한 중요한 변수인 음속비와 밀도비를 측정하였다. 보름달물해파리의 음속비는 음속 도달 시간차 (time-of-fight) 방법을 이용하였다. 측정된 음속비는 0.9966~1.0031으로 평균값 (표준편차, ±SD)은 0.9999 (±0.0017)이었으며, 온도와 박동이 활발할 때와 활발하지 않을 때의 값은 차이가 거의 나타나지 않았다. 밀도비는 중성부력법으로 측정하였고, 계측값은 0.9994~1.0004 범위로 평균값 (표준편차, ±SD)은 1.0000 (±0.0002)이었으며, 채집 해역에 따라 보름달물해파리의 밀도는 차이가 있었으나 주변 해수에 대한 밀도비는 거의 유사하게 나타났다. 이 연구의 결과는 음향 모델을 이용하여 보름달물해파리의 TS를 평가하는 기초 자료로 사용되질 수 있을 것으로 판단된다.
Abstract
The sound-speed and density contrasts are important factors in estimating the target strength (TS) of moon jellyfish (Aurelia aurita). In this study, the sound-speed and density contrasts were measured using time-of-flight and neutral buoyancy methods, respectively. The sound-speed contrast of A. aurita was from 0.9966 to 1.0031 (mean±SD, 0.9999±0.0017) and no distinct differences in temperature or pulsation activity and weak were found. The density contrast was from 0.9994 to 1.0004 (mean±SD, 1.0000±0.0002). The density of A. aurita was substantially different but the density contrast of A. aurita was shown to be similar to that in the sampling location. The results can be used to estimate of TS of A. aurita by acoustic model.
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