선망어업의 생산성 향상에 관한 연구-Ⅱ-파워블럭과 트리플랙스용 선망 모형의 유속에 따른 침강거동-
Studies on the improvement of the productivity of purse seine fishery-Ⅱ - The sinking movements with the flow velocity on the model purse seine of the subjective power block and triplex -
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선망어업의 생산성 향상과 생력화에 관한 기초 연구로서 조업 중 투망과정에서 조류의 영향으로 망형이 변형되어 어려움이 많은데 이 특성을 검토하기 위해 실내 회류수조에서 유속 0, 2, 4, 6cm/sec의 4단계를 설정하고 실험을 실시했다. 일반적으로 제주 근해에서 사용하고 있는 고등어 선망어구인 파워불록용 선망(Power block seine)과 앞으로 예상되는 단선조업에서의 고등어 선망어구인 트리플렉스용 선망(Triplex seine)을 모델로 1/180의 축척비로 제작한 두 가지 모형망을 이용하여 실험을 실시하고 어구별로 선망어구의 침강거동을 해석하였는데, 그 결과는 다음의 내용과 같다. 설정유속 6cm/sec까지는 실험이 가능하였으나 그 이상의 유속에서는 선망어구의 날림과 변형이 심하여 실험이 불가능 하였다. 유속이 있을 때(2,4,6 cm/sec)의 경과시간에 따른 침강수심의 변화 경향은 비슷한 결과를 나타냈다. P seine과 T seine의 침강은 전체적으로 직선적인 현상을 보이고 침강속도는 완만한 곡선적인 현상을 보였다. 침강수심과 침강속도는 그다지 큰 차이는 없지만 P seine이 T seine보다 크게 나타났다. 유속이 있을 때 P seine과 T seine의 경과시간(Et)과 침강수심(PDp, TDp)과의 관계는 각각 PDp=(0.21V+4.96)Et-(0.62V- 0.10) , TDp=(0.19V+4.95)Et-(0.72V+0.34)의 실험식으로 나타 낼 수 있다. 그리고, 유속이 있을 때 P seine과 T seine의 경과시간과 침강속도(PSp, TSp)와의 관계는 각각 PSp=-0.11Et2+1.42Et+1.75, TSp=-0.11 Et2+1.41Et+1.37의 실험식으로 나타낼 수 있다.
Abstract
It is the basic studies for productivity improvement and laborsaving of purse seine fishery. Because the seine shape is apt to be transformed in seine shooting process due to the effect of tide, this study is intended to establish 4 steps, whose flow velocity are 0, 2, 4 and 6cm/sec, in flume tank and perform the experiment to review the character. We used two model seines designed on the scale of 1 to 180 based on the power block seine, which is the mackerel purse seine generally used in the near sea of Jeju Island and triplex seine, which is the mackerel purse seine of one boat system fishing expected in the future, for the experiment, analyzed of the sinking movements on the two seines and its results are as follows. In the setting over the flow velocity 6cm/sec, experiment was impossible because of flying and transformation of seine were severe. The sinking movements of P seine and T seine generally showed linear phenomenon and the sinking speed showed gentle curve shape. Sinking tendency was distinguished by existence of flow velocity. When there is flow velocity, it showed the phenomenon that it sinking by similar type. Although sinking depth and sinking speed did not show distinguished classification, P seine shows bigger than T seine. When there was in flow velocity, the elapsed time(Et) and sinking depth (PDp, TDp) of P seine and T seine can be shown such experimental equations as PDp=(0.21V+4.96)Et-(0.62V-0.10) and TDp=(0.19V+4.95 )Et-(0.72V+0.34). When there was in flow velocity, the elapsed time and siking speed (PSp, TSp) of P seine and T seine can be shown such experimental equations as PSp=-0.11Et2 +1.42Et+1.75 and TSp=-0.11Et2+1.41Et+1.37.
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