기선권현망 현용 어구의 전개 성능
The opening efficiency of the existent net of the anchovy boat seine
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초록
기선권현망어업에서 사용 중인 현용어구의 전개성능을 파악하는 데에 목적으로 두고 실선 해상실험을 행하였으며, 그 결과는 다음과 같다. 현용어구의 어구 형상을 측정한 결과, 오비기 중간, 수비 입구, 앞창, 자루그물 입구, 깔때기, 자루그물 뒤끝의 망고 변화폭과 실제 전개율은 각각 12.9～26.6, 23.3～35.3, 18.4～24.3, 19.0～23.3, 13.5～15.3, 13.2～15.7 m와 19～39, 40～60, 37～49, 79～96, 142～161, 51～61%로 나타났다. 현용어구는 어구 각부의 실제 전개율이 설계상의 망고에 비해 낮게 형성되었으며, 오비기, 수비의 낮은 망고로 인해 앞창과 문턱, 자루그물 입구의 망고가 전개될 수 있는 한계가 정해지면서 그물코의 움살 및 포켓형상이 부분적으로 발생되고 있다. 어구의 예망장력은 4,552∼11,006 kg으로 나타났으며, 예망 중 어구 저항이 자루그물에 집중되어 있으므로 자루그물 뒤끝의 축소를 통하여 물 빠짐 개선, 유체저항 감소, 자루그물 양망과정 중 어로작업 인원의 조업안전성 향상을 이룰 수 있도록 개선함이 필요하다.
Abstract
This study was conducted in order to improve fishing gear for existent net of the anchovy boat seine. Field experiments were performed to observe geometry of nets by catcher boats. When the distances between the two ships were 100, 300, and 500 m, and the speeds of towing nets were 0.6, 0.9, and 1.2 k't, respectively. The vertical opening and actual opening of each part of the existent net was as follows: the middle part of the wing net, 12.9-26.6 m, 19-39%; the entrance of the inside wing net, 23.3-35.3 m, 40-60%; the square and bosom, 18.4-24.2 m, 37-49%; the entrance of the bag net, 19.0-23.3 m, 79-96%; the flapper, 13.2-15.3 m, 142-161%; and the end of the bag net, 13.2-15.7 m, 51-61%. The actual net opening of each part of the existent nets used in this study was lower than that of the design net height, due to the low net height of the wing net and the inside wing net, it limited a range of the net height of the square and bosom. The opening of the entrance of the bag net caused the net pocket shape and inflated some parts of the nets. The tension of towing nets was measured between 4.4 and 11.0 tons, and it is necessary to reduce the structure and improve the structure of the bag net.
참고문헌 (14)
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