DOI QR코드

DOI QR Code

Shape of the model pound net affected by wave and fish behavior to the net - Shape and tension of the model pound net affected by wave -

파동에 의한 모형정치망의 형상변화와 어류대망행동 - 파동에 의한 모형정치망의 형상과 장력변화 -

  • Lee, Ju-Hee (Department of Marine Production System Management, Pukyong National University) ;
  • Kwon, Byeong-Guk (Department of Marine Production System Management, Pukyong National University) ;
  • Yun, Il-Bu (Department of Marine Production System Management, Pukyong National University) ;
  • Kim, Sam-Kon (Department of Fisheries Education, Pukyong National University) ;
  • Yoo, Je-Bum (Department of Fisheries Physics, Graduate school, Pukyong National University) ;
  • Kim, Boo-Young (Department of Fisheries Physics, Graduate school, Pukyong National University) ;
  • Kim, Byung-Soo (Department of Fisheries Physics, Graduate school, Pukyong National University) ;
  • Lee, Hye-Ok (Department of Fisheries Physics, Graduate school, Pukyong National University)
  • 이주희 (부경대학교 해양생산시스템관리학부) ;
  • 권병국 (부경대학교 해양생산시스템관리학부) ;
  • 윤일부 (부경대학교 해양생산시스템관리학부) ;
  • 김삼곤 (부경대학교 수해양산업교육과) ;
  • 유제범 (부경대학교 수산물리학과) ;
  • 김부영 (부경대학교 수산물리학과) ;
  • 김병수 (부경대학교 수산물리학과) ;
  • 이혜옥 (부경대학교 수산물리학과)
  • Published : 2007.05.31

Abstract

The pound net fishery is very important one in Korean coastal fishery and it need to grasp the characteristics of the net affected by many factors. It is considered that the structure and the shape of the pound net can be changed by the direction and speed of current, wave height, depth and conditions of sea bed. However, most of all, the speed of current and wave height influence more upon the pound net than any other factors to deform and flutter. In this study, author carried out the experiments with a model of double one-side pound net made by the similarity law as 1:100 scales at a real experimental area, and additionally the model net experiments were conducted in the circulating water channel in Pukyong National University. The author analyzed the data of transformation of shape and tension of the model pound net to recognize the characteristics of the current and wave acting on it. Regardless of the direction of flow affecting on the fish court net or bag net, the deformed angle and depth to the side panel and bottom of box nets becomes bigger as the wave gets higher and the period of wave is faster. The tension in both upward or downward tends to be changed by the speed of wave. Those value of changes occurred similarly in either fish court net or bag net. Generally, when bag net is located at upward of flow, the value of tension was bigger 10% than any other location or nets. Regardless of the setting direction, the tension of the pound net is increased in proportion to flow speed, wave height and period of wave, and it becomes bigger about 15-30% at upward to flow than downward. Where the flow is upward in the court net, the tension in the wave increased to 37% compared to the one in the flow only in the condition of flow of 0.1-0.3m/s. Where the flow is upward in the bag net, the tension in the wave increased to 52% in the flow of 0.1m/s, and the tension increased to 48% in the flow of 0.2-0.3m/s.

References

  1. Ishidoya, T., 1997. Experiment of the circulating water channel to the model set net and problem on the set net fisheries in Japan, Bulletin of the Japanese Society of Fisheries Oceanography, 62(4), 378-400
  2. Jung, G.C., 1997. Dynamic behavior of model set net in the flow. Master Thesis, Department of Fisheries Physics, Graduate School, Pukyong National University, Korea. pp. 29
  3. Kang, K.M. and H.O. Shin, 2002. Characteristics of current patterns and structure of bamboo weir in samchunpo water area. Bull. Korean Soc. Fish. Tech., 38(1), 69-78 https://doi.org/10.3796/KSFT.2002.38.1.069
  4. Kim, B.Y., 2004. Net shapes of the model set net in the flow. Master Thesis, Department of Fisheries Physics, Graduate School, Pukyong National University, Korea. pp. 36
  5. Kim, T.H., J.O. Kim and D.A. Kim, 2001. Deformation of cage nets against flow velocity and optimal design weight of sinker. Bull. Korean Soc. Fish. Tech., 37(1), 45 - 51
  6. Lee, J.H., M.G. Youm and S.K. Kim, 1988. Fundamental study on the migrating course of fish around the set net - The bottom contour and the tidal current around set net -. Bull. Korean Soc. Fish. Tech., 24(1), 12 - 16
  7. Lee, M.K. and C.W. Lee, 2004. Dynamic analysis of a cage affected by the current. Bull. Korean Soc. Fish. Tech., 40(3), 214 - 224 https://doi.org/10.3796/KSFT.2004.40.3.214
  8. Shin, H.I., Y.W. Ahn and H.O. Shin, 1999. A study on the telemetry system for the inhabitant environment and distribution of Fish - II. Bull. Korean Soc. Fish. Tech., 35(2), 129 - 135
  9. Yun, I.B., J.H. Lee, B.G. Kwon, Y.B. Cho, J.B. Yoo, S.H. Kim and B.Y. Kim, 2004. A study on improvement for fishing gear and method of pound net - I. Bull. Korean Soc. Fish. Tech., 40(4), 268-281 https://doi.org/10.3796/KSFT.2004.40.4.268
  10. Yun, I.B., 2005. Improvement of underwater shape of pound net. Ph.D. Thesis, Department of Fisheries Physics, Graduate School, Pukyong National University, Korea. pp. 131