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徐斗玉,張志元 釜山水産大學校 1971 釜山水産大學 硏究報告 Vol.11 No.2
차동변압기를 이용해서 직독식의 수중장력계와 망심계를 연구하여 이들의 특성을 시험한 결과는 다음과 같다 1) 직독식 수중장력계 ① 측정범위 : 0∼2000㎏ ② 정도 : ±2㎏ ③ 감도 : 2㎏ ④ 건전지 사용시간 : 91시간 2) 직독식 망심계 ① 측정범위 : 0∼200m ② 정도 : ±50㎝ ③ 감도 : 30㎝ ④ 건전지 사용시간 : 91시간 위와 같은 성능이면 수중에서 어구의 장력 및 깊이를 측정하는 계측기로서 어업목적에는 충분히 사용될 수 있다고 생각된다. Measurements and observations of the main characteristics of full scale fishing gear in operation under actual fishing conditions are indispensable for rational studies aiming at development of new, or improvement of existing fishing gears and methods. Most of the underwater instruments which have been adopted for the purpose were self-recording type. Those types of the instruments have some undesirable disadvantages. The measured values are readable only after they are hauled up on board, and it is impossible to check whether the instruments are working or not during the fishing gear performance. Therefore the author made researches in a direct reading underwater tension-meter and a net depth-meter. These instruments are the telemeters having a differential transformer which transduce mechanical displacement into induced electromotive force. The induced electromotive force is proportional to the displacement of a core of the differential transformer. The main characteristics of the instruments studied were as follows: (1) With respect to the underwater tension-meter; Measurable range: 0-2000㎏ Sensitivity: 2㎏ (2) With respect to the net depth-meter; Measurable range: 0-200m Sensitivity: 30㎝ In conclusion, those instruments can be satisfactorily used for the measurements of the characteristics of the fishing gears.
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魚礁에 關한 硏究(1) : 西歸浦 沿岸의 海底地形에 關하여 The submarine topography of Seogwipo coast
辛亨鎰,朴正埴,徐斗玉 제주대학교 1976 논문집 Vol.8 No.-
Submarine topography and the force of the wind investigated in Seogwipo coast owing to set up articial fishreef. The results obtained are as follows ; 1. Bottom of position A and B was took the part of the natural fishreef, and 20-40m depth area of a reasonable waters to set up fishreef was 1.43㎢. 2. Position C locating between position A and B was formed to slow inclination from the open sea, where was assumed to waters require to the throng equipment of fishies. 3. Maximum wind velocity of the investigated waters was 18.5m/sec from Oct. 1975 to Sep. 1976, and then drift current was 25.9㎝/sec, depth of frictional influence was 188m.
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손태준,박정식,서두옥 한국수산학회 1977 한국수산과학회지 Vol.10 No.4
西歸浦 沿岸에 人工魚礁를 設置하여 魚礁의 形態와 魚群의 蝟集에 關한 硏究에서 아래와 같은 結果를 얻었다. 1. 魚礁設置 海域의 15m 水深層에 대한 吹送流는 最高流速이 15.28㎝/sec였고 流向은 WSW가 20.5%였다. 2. 흐름과 波에 의한 圓形垂下型魚礁의 流體抵抗은 約 890㎏이 最大였고, 魚礁에 附着된 멍의 重量은 1,200㎏로서 固定力이 充分하였다. 3. 파라슈트魚礁에 대한 最大抵抗은 106.3㎏로서 멍의 固定力은 充分했으나 비닐캔버스와 展開用 資材가 弱하여 維持되지 못하였다. 4. 濟州島 近海産 重要魚類 53種中 人工魚礁에 蝟集한 魚種은 16種이었고 漁獲組成比는 참돔 23%, 볼락 13%, 보리멸 11%, 우럭볼락 7%, 쥐치 6%이고 潛水 觀察에서 魚礁의 中層部에 많은 稚魚가 蝟集된 것을 確認하였다. This study intended to investigate the shape of the artificial fish reefs settled in the waters of Seogwipo, and the thronging of fish schools into them. The results obtained are summarized as follows: 1. Two types of artifical fish reef, circularized vertical type which is composed of Cryptomeria branches and parachute type, were put off the coast of Seogwipo at 33˚14'05" N Lat.,126˚34'40" E Long. The setting place is located 0. 4 sea-mile away from natural fish reefs, at 25 m in depth. And its sediment is consisted of f. S. and Sh. 2. Maximum velocity of wind drift current was 15.28 ㎝/sec at 15 m depth. The current direction was 20.5% in the WSW. 3. Maximum fluid resistance of the circularized vertical type to current and wind waves showed about 890 ㎏, and the weight of sand bags attached to the fish reef totaling 1,200 ㎏ was enough to sustain fish reef. 4. As maximum fluid resistance of the parachute type to current and wind waves was 106.3 ㎏, the retaining force of sand bags was enough to sustain the fish reef, but vinyl canvas and expansion materials were so poor that the fish reef was lost by the sea current and wind waves. 5. Sixteen species of fish among 53 usually caught in this area were thronged into the artificial fish reef. The fish catches comprized porgy (Pagrosomus major) 23%, black kock fish (Sebastes (Mebarus) inermis) 13%, sand borer (Sillago sihama) 11%, Sebastes (Pteropodus) hubbsi 7%, and file fish (Monacanthus cirrhifer) 6%. According to the submarine observations by divers, it was confirmed that a lot of fish larvae thronged in the middle part of the fish reefs.
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손태준,박정식,서두옥,SHON Tae Joon,BAE Jeong Sig,SOH Doo Ok 한국수산과학회 1977 한국수산과학회지 Vol.10 No.3
서귀포 연안에 인공어초를 설치하여 어군의 형태와 어군의 위집에 관한 연구에서 아래와 같은 결과를 얻었다. 1. 어초설치 해역의 15.28cm/sec였고 유향은 WSW가 $20.5\%$에 대한 취송류는 최고유속이 15.28cm/sec 유향은 WSW가 $20.5\%$였다. 2. 흐름과 파에 의한 원형수하형어초의 유체저항은 약 890kg이 최대였고, 어초에 부착된 멍의 중량은 1,200kg로서 고정력이 충분하였다. 3. 파라슈트어초에 대한 최대저항은 전개용 자료가 약하여 유지되지 못하였다. 4. 제주도 근해산 중요어류 53종중 인공어초에 위집한 어종은 16종이었고 어획조성비는 참돔 $23\%, 볼라 $13\%, 보리멸 $11\%$, 우럭볼락 $7\%$, 주치 $6\%$이고 잠수관찰에서 어초의 중층부에 많은 치어가 위집된 것을 확인하였다. This study intended to investigate the shape of the artificial fish reefs settled in the waters of Seogwipo, and the thronging of fish schools into them. The results obtained are summarized as follows : 1. Two types of artifical fish reef, circularized vertical type which is composed of Cryptomeria branches and parachute type, were put off the coast of Seogwipo at $33^{\circ}14'05'$ N Lat., $126^{\circ}34'40'$ E Long. The setting place is located 0.4 sea-mile away from natural fish reefs, at 25 m in depth. And its sediment is consisted of f. S. and Sh. 2. Maximum velocity of wind drift current was 15.28 cm/sec at 15 m depth. The Current direction was $20.5\%$n in the WSW. 3. Maximum fluid resistance of the circularized vertical type to current and wind waves showed about 890 kg, and the weight of sand bags attached to the fish reef totaling 1,200 kg was enough to sustain fish reef. 4. As maximum fluid resistance of the parachute type to current and wind waves was 106.3 kg, the retaining force of sand bags was enough to sustain the fish reef, but vinyl canvas and expansion materials were so poor that the fish reef was lost by the sea current and wind waves. 5. Sixteen species of fish among 53 usually caught in this area were thronged into the artificial fish reef. The fish catches comprized Porgy (Pagrosomus major) $23\%$, black kook fish (Sebastes (Mebarus) intermis) $13\%$, sand borer (Sillago sihama) $11\%$, Sebastes (Pteropodus) hubbsi $7\%$, and file fish (Monacanthus cirrhifer) $6\%$. According to the submarine observations by fivers, it was confirmed that a lot of fish larvae thronged in the middle part of the fish reefs.
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