Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Studies on the Improvement of the Productivity of the Purse Seine Fishery - The characteristics on the motion of purse seine in the experimental operation of one boat system -

선망어업의 생산성 향상에 관한 연구 - 단선식 시험조업에 있어서 선망의 운동특성 -

  • Published : 2003.05.01
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Abstract

The fundamental studies on the productivity improvement of the purse seine fishery are presented in this paper. The experiment on net shooting and hauling was carried out in the near sea of Jeju Island (33$^{\circ}$37.8' N, 126$^{\circ}$31.1' E) by using the Cheju national university training ship (A-Ra, 990tons) which was constructed for the one boat system operation of purse seine. The corkline and leadline of the purse seine used for the experiment were 829.1m and 995.7m in length, respectively. Micro data recorder system, net sonde, and tensiometer were used to measure the depth of leadline and the tension of purse seine. Based on the measurement data, the motion and tension of purse seine at the time of shooting, hauling, and pursing were characterized. The experimental results are summarized as follows ; 1. The shooting and hauling of net were found to be possible in the one boat system experimental operation. 2. At the time of purse seine shooting, the relationship between the depth (Dp) of leadline and elapsed time (Et) was found to be Dp=7.58Et-6.48. 3. At the time of pursing, the relationship between the depth (Dp) of leadline and elapsed time (Et) was found to be Dp=-0.8Et$^2$＋7.42Et＋92.04. 4. At the time of pursing, the tension (metric tons) of purse seine attained its maximum value (14.7tons) when the elapsed time is 8 minutes. The relationship with the elapsed time was found to be T=-0.13Et$^2$＋3.23Et-5.72.

선망어업의 생산성 향상에 관한 기초 연구로서 제주도 주변 해역어장(33$^{\circ}$37.8' N, 126$^{\circ}$31.1' E)에서 단선조업이 가능하도록 건조된 시험 조업선인 제주대학교 해양과학대학 실습선 아라호(990톤)를 사용하여 투망과 양망 등의 실험을 실시했다. 실험에 사용한 선망은 뜸줄의 길 829.1m, 발줄의 길이 995.7m이다. 초소형 메모리 계측기와 망심계, 장력계를 사용하여 그물 아랫자락의 수심과 선망의 장력을 측정하였으며, 측정한 자료를 이용하여 투망과 양망할 때의 그물어구의 운동특성과 장력특성을 해석하였는데, 그 결과를 요약하면 다음과 같다. 1. 단선식 조업방법에 의해 실시한 시험조업에서 선망의 투망과 양망이 가능했다. 2. 선망을 투망할 때 그물 아랫자락의 침강수심(Dp)과 경과시간(Et)의 관계는 값의 설정범위에서 다음과 같은 실험식으로 나타낼 수 있다. Dp=7.58Et-6.48 3. 죔줄을 죌 때 그물 아랫자락의 침강수심과 경과 시간의 관계는 값의 설정 범위에서 다음과 같은 실험식으로 나타낼 수 있다. Dp=-0.8Et$^2$＋7.42Et＋92.04 4. 죔줄을 죌 때 선망의 장력은 경과시간 8분일 때 최대값(14.7톤)을 나타냈으며, 장력과 경과시간의 관계는 값의 설정범위에서 다음과 같은 실험식으로 나타낼 수 있다. T=-0.13Et$^2$＋3.23Et-5.72

Keywords

References

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