안강망의 그물 구성에 따른 상괭이 탈출 유도망의 전개 성능 차이
The opening efficiency difference of guide net in finless porpoise escape device by the type of extension net in stow net
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이 연구는 안강망 어구에 설치되는 상괭이 탈출 유도망의 전개 성능 향상을 위해 연장망에 사용된 그물 종류에 따른 상괭이 탈출 유도망의 전개 성능을 파악하는 것을 목적으로 한다. 이를 위해 자루그물 연장망을 실물 크기로 제작하여 수조에서 유속(0.2, 0.4, 0.6, 0.8 m/s) 및 연장망의 그물 종류(25 mm망, 세목망)에 따른 망구 면적과 예인 장력 조사하였다. 그 결과 유도망의 망구 면적은 모든 유속 조건에서 연장망에 세목망을 사용했을 때가 25 mm망을 사용했을 때보다 컸다. 또한 그물 종류와 무관하게 유속 0.4 m/s에서 망구 면적이 최대 면적의 약 80%에 도달하였는데 현장에서도 조류 속력이 0.4 m/s 이상일 때만 조업하는 것이 확인되어 유속 0.4 m/s가 안강망의 조업 가능 여부를 결정하는 의미 있는 값으로 확인되었다. 그리고 유도망의 망구 면적과 예인 장력과의 관계를 분석한 결과, 연장망의 그물 구성에 따른 유도망의 전개 성능 차이는 그물의 공극률 차이에 기인한 것으로 확인되었다.
Abstract
This study aims to understand the opening efficiency of the finless porpoise escape guide net by the type of extension net that is the part to which the escape guide net is attached in stow net. To this end, extension nets were manufactured in full size and the net mouth area and towing tension were investigated according to the towing speed (0.2, 0.4, 0.6 and 0.8 m/s) and the type of extension net (25 mm net and raschel net) in the water tank. As a result, the net mouth area of the guide net was larger when the raschel net was used for the extension net than when the 25 mm net was used under all towing speeds. In addition, regardless of the type of extension net, the net mouth area reached about 80% of the maximum value at a towing speed of 0.4 m/s. In the field, fishing operation of stow net is performed only when the current speed is above 0.4 m/s. Therefore, the speed of 0.4 m/s was confirmed as a meaningful value to determine whether it is possible to operate. As a result of analyzing the relationship between the net mouth area of the guide net and the towing tension, it was confirmed that the difference in the net mouth area of the guide net according to the type of the extension net was due to the difference in the solidity ratio.
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