수산해양기술연구(구 한국어업기술학회지) 56권 1호 (p.1-10)

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참치선망어선의 타원형 투망궤적 분석

Analysis of the elliptical shooting trajectory for tuna purse seine
키워드 :
Tuna,Purse seine,Elliptical,Trajectory

목차

서 론
재료 및 방법
   선망그물의 사양
   원형 투망궤적
   타원형 투망궤적
   연구 방법
결과 및 고찰
   타원의 형태
   타원의 방정식
   그물 중심부의 발줄 침강 속도와 침강 깊이
   어군의 속도에 따른 분석
   어군의 허용 반경
고 찰
결 론
References

초록

In the previous study, a shooting trajectory assuming that the purse seine shooting trajectory is a circle was proposed based on the speed and direction of the movement of the fish school. However, in practice, a trajectory that is closer to an elliptical shape than a circular one is often formed. In this study, the existing circular trajectory and the elliptical trajectory methods were compared under the same conditions to confirm the effectiveness of elliptical shooting trajectory. In addition, changes in the eccentricity of ellipses were derived to assess which type of ellipse was appropriate as a shooting trajectory. When a high-speed fish school moves in a straight line, an elliptical shooting trajectory with the eccentricity of 0.7 to 0.9 will be reasonable, and for middle-low speed fish school, an elliptical shooting trajectory with the eccentricity of 0.4 to 0.6 will be more useful than a circle shooting trajectory.