씨앵커의 구성에 따른 수중 안정성에 관한 연구
A study on the underwater stability according to the composition of the sea anchor
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초록
씨앵커는 근해채낙기와 선망에서 많이 사용된다. 씨앵커에 대한 연구는 씨앵커의 형태와 배수구의 크기에 따른 전개효율과 저항의 개선을 위해 연구되어졌다. 그러나 수중안정성에 대해서는 아직 많이 알려지지 않고, 표준화 또한 되어있지 않은 상태이다. 그러므로 본 연구는 씨앵커의 배수구 크기와 침자를 바꾸면서 씨앵커의 수중안정성을 높이는 연구를 목표로 하였다. 씨앵커의 실험모델은 어업에서 실제로 쓰이는 실물 씨앵커를 모델로 상사법칙을 이용하여 제작하였다. 모형 씨앵커는 배수구의 크기와 침자의 무게를 다르게 하여 유속별로 측정되었다. 씨앵커의 좌우이동 (x축)과 상하이동 (z축), 저항(y축)은 30초간 측정되었다. 각각의 값은 t검정과 분산분석을 통하여 분석되었다. 씨앵커의 좌우운동과 상하운동은 상관관계를 가지고 있었다. 씨앵커의 저항은 유속이 증가할수록 강했지만, 배수구가 클수록 저항은 감소하였다. 표준편차의 결과에서, 씨앵커의 좌우운동은 배수구가 클수록 감소하였다. 그러나 씨앵커의 상하운동은 침자의 무게가 가볍거나 무거울때 표준편차가 크게 나타났다. 이러한 결과는 수중안정성을 높히기 위해서 씨앵커의 배수구와 침자의 무게에 적절한 크기가 배치되어야 한다.
Abstract
Sea anchor for fishery is commonly used in jigging fishery and purse seine. The study of sea anchor was studied for improvement of opening efficiency and drag by changing the type of shape and the diameter of vent. However, standard specification of sea anchor is not set and has not been studied for underwater stability. Therefore, this study aimed to improve underwater stability of sea anchor by changing a vent diameter and weight of sinker. The experiment was conducted in flume water tank. The experiment model of sea anchor was made from actual model of sea anchor which is used in fishery by similarity law. The model of sea anchor was designed to different types of vent diameter and weight of sinker in different current speed. The value of movement of side to side (X-axis), drag of sea anchor (Y-axis) and movement of up and down (Z-axis) was measured for 30 seconds. Each value of X, Y, Z-axis was analyzed through t-test and ANOVA analysis to verify that each value had a significant difference according to the difference compositions. There was correlation between the movement of X-axis and Z-axis. The drag of sea anchor was stronger as the current speed increased. However, the larger the vent diameter, the weaker the drag. From the result of the standard deviation, the movement of X-axis was inversely proportional to the vent diameter. However, movement of Z-axis was larger as the weight of sinker was the heaviest or lightest from the result of the standard deviation. These results suggest that the sea anchor should be combined with proper size of the vent diameter and the weight of sinker to improve the stability.
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