韓國 近海에 있어서의 中層 트로올의 硏究 - Ⅱ 漁具의 水平展開度

• 영문명: Study on the Midwater Trawl Available in the Korean Waters - Ⅱ Horizontal Opening of the Gear
• 발행기관: 군산대학교 수산과학연구소
• 저자명: 이병기(Byoung-Gee LEE) 김동건(Jin-Kun KIM) 최종화(Jong-Hwa CHOE) 장호영(Ho-Young CHANG)
• 간행물 정보: 『군산대학교 수산과학연구소 연구논문집』제1집, 195~201쪽, 전체 7쪽
• 주제분류: 농수해양 > 해양학
• 파일형태: PDF
• 발행일자: 1994.12.01

영문 초록

The authors carried out an experiment to determine the horizontal opening of the midwater trawl gear, which is the same as was used in the foreward experiment concerned to the attitude and opening efficiency of otter board. The trawl net used in the experiment was designed to have a square sectional four-seamed body with two three-seperated wings. Each wing tip was rigged with a net pendant of 70m long and the fore ends of the pendants were directly jointed to the otter pendant without inserting hand rope, and a front weight of 200 kg weigh was rigged with in front of the lowest wing tip. To determine the opening between otter boards and between wing tips, two 50KHz fish finders were set sideways on the otter board and on the port middle wing tip so as to detect the distance from the finders to the starboard otter board and to the wing tip respectively, and the informations were transmitted to the indicators onboard the ship through water-tight cables. The results obtained can be summarized as follows: 1. The openings between otter borads were 43-45 m in case of the warp 100 m. 53-.55m in the warp 150 m and 54~59 m in the warp 200 m. It was increased in linear according to the increase of towing speed in the range of 1.1- 1.8 m/sec. 2. The determined values of the openings between otter boards were greater than the estimated values, which were calculated by the opening between warps at the gallows of the ship and the length of the warp, assuming that the warps from the top rollers to the otter boards were straight. The rates of the determined values to the estimated values were 1. 23~11.0 in case of the warp 100m, 1.23-1.12 in the warp 150m and 1.23~1.15 in the warp 200m respectively. The rates were almost the same at the slow towing speed of 1.3 m/sec or so. then the higher the speed, the less the rate, and the longer the warp, the greater the rate. 3. The rates of the openings between otter boards to the total length of net pendant and the net (excluded cod end) showed 43~48% in case of the warp 150-200m. It was a little smaller than the standard, which is 50%, in the common bottom trawl. 4. The determined openings between wing tips were 18~19m in Case of the warp lO0m, 21~22m in the warp 150m. They showed that the higher the speed, the greater ths openings even though its range was no more than I m or so. 5. The rates of openings between otter boards to the openings between wing tips were almost invariably 38 %. 6. The rates of openigs between otter boards to the lenth of head rope were 60~63% in case of the warp lO0~150m. It were much larger than the standard, which is 50%, in the common bottom trawl.

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