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음향 기법을 이용한 동계 독도 주변해역 매오징어(Watasenia scintillans) 및 기타어군의 분포 및 현존량 산정
이형빈,윤상철,임양재,김정년,김맹진,최광호,Lee, Hyungbeen,Yoon, Sang Chul,Lim, Yang Jae,Kim, Jung Nyun,Kim, Maeng Jin,Choi, Kwang Ho 한국수산과학회 2017 한국수산과학회지 Vol.50 No.4
The spatial distribution and abundance of fish species was estimate near Dok-do, East Sea of Korea by conducting midwater trawl survey with hydroacoustic method. Acoustic and midwater trawl data were collected onboard the R/V Tamgu 21 during 7-8 March 2016. Acoustic data were collected at the frequencies of 38 and 120 kHz and converted to nautical area scattering strength ($m^2/nmile^2$). Species are distributed mainly over an extent of 30-55 m, generally around southwest of Dok-do; the squid Watasenia scintillans was the dominant species found. The length-weight function and target strength of squid and other fishes were used to estimate the W. scintillans stock at 2499.1 tons and other fish at 43.8 tons during the winter season. The hydroacoustic method offers an approach for the determination of the biomass and vertical and spatial distributions of species aggregating near Dok-do, East Sea of Korea.
조업선에서 수집한 음향자료에 대한 잡음 제거 기법에 관한 연구
이형빈 ( Hyungbeen Lee ),최석관 ( Seok Gwan Choi ),이경훈 ( Kyounghoon Lee ),이재봉 ( Jae Bong Lee ),이종희 ( Jong Hee Lee ),최정화 ( Jung Hwa Choi ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.3
The Commission for Conservation of Antarctic Marine Living Resources (CCAMLR) is utilized to manage krill resources using acoustic data collection and a scientific observer program operating on the fishing boats. However, the acoustic data were contained seriously noise, example of background, spike, and intermittent noise, due to purpose of fish boats. In this study, the noise removal techniques were confirmed the potential of the acoustic data analysis. Acoustic system and frequency used in the survey were commercial echosounder (ES70, SIMRAD) and 200 kHz split beam transducer. Acoustic data were analyzed using Echoview software (Myriax), and general data analysis and new noise removal method was used. Although a variety of noise, most of the noises have been removed using the noise removal processing. We confirmed the possibility of analyzing the acoustic data obtained from fish boats. The results will be useful for analysis of the acoustic data acquired from krill fishing boats.
음향 실험 및 모델 기법을 이용한 도루묵 (Arctoscopus japonicus)의 음향산란반사강도 특성
이형빈 ( Hyungbeen Lee ),이경훈 ( Kyounghoon Lee ),윤은아 ( Eun A Yoon ),황강석 ( Kangseok Hwang ),최정화 ( Junghwa Choi ),박태건 ( Tae Geon Park ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.3
Acoustic target strength (TS) measurement and theoretical acoustic scattering models were applied to estimate the TS for assessing the fish biomass. TS measurement was made of ex situ sailfin sandfish Arctoscopus japonicus at 70 and 120 kHz, and then compared to backscatter model prediction. The live sandfish was tethered in seawater using monofilament lines. Measurements were made versus incidence angle, -50° to 50° relative to dorsal aspect directions. Distorted wave Born approximation (DWBA) model was used to calculated TS pattern. The TS values of sandfish (body length: 16.2 cm) at 70 and 120 kHz were -66.94 dB and -64.45 dB, respectively, and were about 20 dB lower than TS of other fishes in Korea waters. These TS levels were distributed within the range of the theoretical TS. Ex situ measurement and theoretical TS may be applied to improve acoustical detection and biomass estimation of the sandfish, and is necessary to measure with various lengths.
남극 남쉐틀랜드 군도 주변 해저면 음향신호를 이용한 상업용 어군탐지기 보정 연구
최석관 ( Seok-gwan Choi ),이형빈 ( Hyungbeen Lee ),이경훈 ( Kyounghoon Lee ),이재봉 ( Jaebong Lee ) 한국어업기술학회 2016 수산해양기술연구 Vol.52 No.4
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 < S<sub>V 120 kHz-38 kHz</sub> < 12 dB (i.e. a common S<sub>V 120 kHz-38 kHz</sub> 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.
황강석 ( Kangseok Hwang ),윤은아 ( Eun A Yoon ),이경훈 ( Kyounghoon Lee ),이형빈 ( Hyungbeen Lee ),황두진 ( Doo Jin Hwang ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.3
This study was focused on acoustic scattering characteristics of jack mackerel (Trachurus japonicus) at frequency 38, 70, and 120 kHz by Kirchhoff-ray mode (KRM) model. The body length (BL) of 16 individuals ranged in 12.2~22.0 cm (mean±S.D.: 17.8±3.2 cm) and the swimbladder length ranged in 4.2~8.6 cm (mean±S.D.: 6.6±1.6 cm) and the swimbladder cross section ranged in 1.7~6.6 cm2 (mean±S.D.: 3.8±1.6 cm2). This result shows that results correlate well between the BL and the length and cross section of swimbladder. The swimbladder angle ranged in 7~12°and the maximum TS values ranged in 16~ 5°at tilt angle. The averaged TS-to-BL relationship were TS38kHz=20log10BL-65.33 (R2=0.66), TS70kHz=20log10BL-65.90 (R2=0.67), and TS120kHz=20log10BL-66.65 (R2=0.65). These results can be used fundamental data in order to estimate distribution and biomass of jack mackerel by using hydro-acoustic method.