저층 트롤의 그물입구 형상과 소해 단면적
The gear shape and cross section of sweep at mouth of a bottom trawl
0
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
How to estimate the gear shape and cross section of sweep at mouth of a bottom trawl net was described and applied to the field experiments obtained with the Scanmar system. The shape of the trawl net from wingend to the beginning of codend was assumed to be part of an elliptic cone of which the cross section was ellipse, and that of the float rope be of form . In case of a bottom trawl with warp 180m long, the radius of ellipse, the cross section of sweep at mouth, the eccentricity of the ellipse, the inclination angle of float rope and the contribution of the side panel to net height were estimated in accordance with the towing speed. The horizontal radius of the upper ellipse increased with increasing towing speed, the eccentricity of it became slightly bigger as increasing the towing speed which meant the shape of it being flat and the inclination angle of the float rope was about between 7 and 12 degrees in case of the current bottom trawl.
Abstract
How to estimate the gear shape and cross section of sweep at mouth of a bottom trawl net was described and applied to the field experiments obtained with the Scanmar system. The shape of the trawl net from wingend to the beginning of codend was assumed to be part of an elliptic cone of which the cross section was ellipse, and that of the float rope be of form . In case of a bottom trawl with warp 180m long, the radius of ellipse, the cross section of sweep at mouth, the eccentricity of the ellipse, the inclination angle of float rope and the contribution of the side panel to net height were estimated in accordance with the towing speed. The horizontal radius of the upper ellipse increased with increasing towing speed, the eccentricity of it became slightly bigger as increasing the towing speed which meant the shape of it being flat and the inclination angle of the float rope was about between 7 and 12 degrees in case of the current bottom trawl.
참고문헌 (16)
- Cho, B.K., "A study on the bottom trawl gear by the trial of a stern trawler II-On the net shape of a bottom trawler gear", Bull. Korean Soc. Fish. Tech, 36(4), pp.281~286 (2000)
- Engas, A., "The effects of trawl performance and fish behaviour on the catching efficiency of demersal sampling trawls, in: Marine fish behaviour in capture and abundance estimation", pp.45~68 (1994), Fishing News Books
- Fridman,A.L.(revised by P.J.G.Carrothers), "1986. Calculations for fishing gear designs. FAO Fishing Manuals", pp.153~184 (1986), Fishing News Books Ltd
- Fujimori, Y., "The influence of warp length on trawl dimension and catch of walleye pollock Theragra chalcogramma in a bottom trawl survey", Fisheries Science, 71, pp.738~747 (2005)
- Hu, F., "Scale model of a new midwater trawl system for sampling pelagic larval and juvenile fish", Fisheries Science, 67, pp.254~259 (2001)
- Lee, C.W., "Simplified trawl system modeling and design of a depth control system using fuzzy logic", Fisheries Research, 53, pp.83~94 (2001)
- Lee, C.W., "Physical modeling for underwater flexible systems dynamic simulation", Ocean engineering, 32, pp.331~347 (2005)
- Matuda, K., "Fishing gear physics", pp.226~ (2001), Seizando
- Park, G.J., "A model experiment on the underwater bottom trawl net", J. Korean Soc. Fish. Tech, 42(3), pp.134~147 (2006)
- Park, H.H., "A tension measurement method of a towing cable or a buoy cable", Ocean Engineering, 20(2), pp.163~170 (1993)
- 박해훈, "종만곡 V형 전개판의 영각 추정법", 한국어업기술학회지, 41(2), pp.113~121 (2005), 한국어업기술학회
- Park, H.H., "Numerical analysis on the headline heights of a trammel net in a flume tank experiment", J. Korean Soc. Fish. Tech, 42(3), pp.127~133 (2006)
- Park, H.H., "A method for estimating the gear shape of a mid-water trawl", Ocean Engineering, 34, pp.470~478 (2007)
- Sangster, G.I, "Gear performance and catch comparison trials between a single trawl and a twin rigged gear", Fisheries Research, 36, pp.15~26 (1998)
- Shimizu, T., "Application of NaLA, a fishing net configuration and loading analysis system, to bottom gill nets", Fisheries Science, 73, pp.489~499 (2007)
- Somerton, D.A., "Whole-gear efficiency of a benthic survey trawl for flatfish", Fishery Bulletin, 105, pp.278~291 (2007)