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유영행동에 따른 대형 해파리의 음향산란 변동의 이론적 검토

Theoretical Examination of the Effects of Fluctuation of Acoustic Scattering on the Swimming Behavior of Giant Jellyfish

  • 이유원 (부경대학교 해양생산시스템관리학부) ;
  • 황보규 (부경대학교 해양산업개발연구소)
  • Lee, You-Won (Division of Marine Production System Management, Pukyong National University) ;
  • Hwang, Bo-Kyu (Research Center for Ocean Industry Development, Pukyong National University)
  • 투고 : 2009.02.18
  • 심사 : 2009.04.02
  • 발행 : 2009.04.30

초록

Recently, wide spread distribution of the giant jellyfish, Nemopilema nomurai, has occurred in the East China Sea. This increased distribution has caused serious problems in inshore and offshore fisheries in Korea and Japan. As a result, it is necessary to evaluate the damage caused to the fisheries by jellyfish. Accordingly, several hydroacoustic studies have been conducted to estimate the target strength (TS) of the giant jellyfish. However, the effects of fluctuation in the acoustic scattering characteristics on swimming patterns have not yet been elucidated. Therefore, in this study, we theoretically estimated the effects of changes in the acoustic scattering pattern on the swimming behavior of jellyfish using the Distorted Wave Born Approximation (DWBA) model. The results confirmed that acoustic scattering of jellyfish results in a significant change in their swimming pattern. Specifically, our theoretical estimation indicated that the TS of giant jellyfish (d=40 cm) fluctuated until 8.5 dB at 38 kHz, 13.8 dB at 70 kHz, and 15.1 dB at 120 kHz based on changes in their swimming patterns.

키워드

참고문헌

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피인용 문헌

  1. Measurements of Sound Speed and Density Contrasts of the Moon Jellyfish (Aurelia aurita s.l.) for Hydroacoustic Model vol.34, pp.1, 2012, https://doi.org/10.4217/OPR.2012.34.1.085
  2. Characteristics of Acoustic Scattering according to Pulsation of the Large Jellyfish Nemopilema nomurai vol.43, pp.5, 2010, https://doi.org/10.5657/kfas.2010.43.5.551
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  4. An estimation of the sound-speed and density of moon jellyfish (Aurelia aurita) in Korean waters vol.49, pp.4, 2013, https://doi.org/10.3796/KSFT.2013.49.4.483
  5. 남해 연안에 분포하는 해파리(Aurelia aurita, Cyanea nozakii)의 복수 개체에 의한 음향 표적강도 특성 vol.32, pp.2, 2009, https://doi.org/10.4217/opr.2010.32.2.113
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