Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)
- Volume 26 Issue 1
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- Pages.14-19
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- 1990
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- 2671-9940(pISSN)
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- 2671-9924(eISSN)
동지나해의 초음파 산란층에 관한 연구 ( 1 ) ( Acoustic Scattering Layers in the East China Sea ( 1 ) )
- Lee, Dae-Jae (National Fisheries University of Pusan) ;
- Shin, Hyeong-Il (National Fisheries University of Pusan) ;
- Park, Jung-Hee (National Fisheries University of Pusan)
- Published : 1990.03.01
Abstract
This paper describes on the characteristics of the acoustic echoes from the scattering layers by the aggregation of marine organisms which was measured by using a 50kHz echo sounder on board of the training ship SAEBADA belong to National Fisheries University of Pusan during the summer, 1989 in the East China Sea. A data acquisition system was used to record digitally the envelope of the echoes and the frequency distribution of echo amplitudes on the whole water column was examined as a function of time during the sunrise and sunset periods. Acoustic data showed that the abundance distribution of marine organisms according to depth in the servery area changed with time and that the organisms were most active during the twilight of morning, and the echo strength on the water column or scattering layer was also strongest during this time. Additional results of this survey suggest that other interest, such as the relationship between environmental conditions and biomass depth distribution, could be also investigated in hydroacoustic method.
동지나해의 초음파산란층에 대한 기초적 연구로서, 산란층의 주야간에 대한 수직이동상태와 Echo 신호의 변동특성에 관하여 검토한 결과, 수심 20m~80m에 형성된 상\ulcorner하한의 수온차가 약 11
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