Effect of flagpole attached to buoy on tension of buoy rope of gillnet

자망어구 부이의 깃대가 부이줄 장력에 미치는 영향

  • CHO, Sam-Kwang (Fisheries resources and environment Division, West Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • LEE, Gun-Ho (Fisheries resources and environment Division, West Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • CHA, Bong-Jin (Fisheries Engineering Division, National Institute of Fisheries Science) ;
  • JUNG, Seong-Jae (Fisheries Engineering Division, National Institute of Fisheries Science) ;
  • KIM, In-Ok (Fisheries Engineering Division, National Institute of Fisheries Science)
  • 조삼광 (국립수산과학원 서해수산연구소 자원환경과) ;
  • 이건호 (국립수산과학원 서해수산연구소 자원환경과) ;
  • 차봉진 (국립수산과학원 수산공학과) ;
  • 정성재 (국립수산과학원 수산공학과) ;
  • 김인옥 (국립수산과학원 수산공학과)
  • Received : 2016.10.31
  • Accepted : 2016.11.29
  • Published : 2016.11.30


This study aims to reduce the force exerted to the buoy of the gillnet by wave and current. Five buoy models were selected for experiments and their rope tensions under wave and current action were compared. Five models were EL (ellipsoid), EL-H (ellipsoid-hole), SL (streamlined body), SP (sphere) and CL (cylinder, traditional type). In the first experiment, the Five models were tested without any attachment. In the second experiment, a flagpole was attached to each model. As a result, in the condition without flagpole, the tensions of four models with the exception of the CL were about a half of that of the CL. In the condition with flagpole, the tension of all models was twice larger than that without flagpole. Thus, a new model was suggested to improve the problem, which has a combined body that of a flagpole and a buoy Three new models of CL-L (long and thin cylinder), LF (leaf shape) and LF-F (leaf shape with fin) were designed. Also a cylinder type (CLD) with a flagpole as a control was included in the experiment. As a result, the LF-F had the smallest tension and a half tension of the CLD. Therefore, it is supposed that the flagpole and buoy combined model could reduce the tension on buoy rope and contribute to improve the gillnet loss problem.


Supported by : 국립수산과학원


  1. Brainard EC. 1967. Evaluation of the P.O.E. Buoy with conventional buoy designs. In: Transactions of the 2nd International Buoy Technology Symposium/ Exposition. Marine Technology Society Washington DC, 169-176.
  2. Carpenter EB, Leonard JW and Yim SCS. 1995. Experimental and numerical investigations of tetherd spar and sphere buoys in irregular waves. Ocean Engineering 22(8), 765-784. (DOI:10.1016/0029-8018(95)00016-e)
  3. Capobianco R, Reya V and Calve OL. 2002. Experimental survey of the hydrodynamic performance of a small spar buoy. Applied Ocean Research 24, 309-320. (DOI:10.1016/s0141-1187(03)00026-9)
  4. Jeon IK, Nam IK, Park SC, Lee UL and Jeong IH. 2012. Hydrography. Donghwa, Gyeonggi, Korea, 451-454.
  5. Jenkins, CH, Leonard JW, Walton JS and Carpenter EB. 1995. Experimental investigation of moored-buoys using advanced video techniques. Ocean Engineering 22(4), 317-335. (DOI:10.1016/0029-8018(94)00022-y)
  6. Kim WJ and Perkins NC. 2002. Linear vibration characteristics of cable buoy systems. Journal of Sound and vibration 252(3), 443-456. (DOI:10.1006/jsvi.2001.3849)
  7. Leonard JW, Idris K and Yim SCS. 2000. Large angular motions of tethered surface buoys. Ocean Engineering 27, 1345-1371. (DOI:10.1016/s0029-8018(99)00046-3)
  8. Lee GH, Kim IO, Cha BJ, Jung SJ. 2014. Difference of tension on mooring line by buoy type. J Korean Soc Fish Technol 50(3), 233-243. (DOI:10.3796/ksft.2014.50.3.233)
  9. Lee GH, Kim IO, Cha BJ, Jung SJ. 2015. Analysis for gillnet loss in the West Sea using numerical modeling. J Korean Soc Fish Technol 51(4), 600-613. (DOI:10.3796/ksft. 2014.50.3.233)
  10. Lin H, Yim SCS and Gottlieb O. 1998. Experimental investigation of response stability and transition behavior of a nonlinear ocean structural system. Ocean Engineering 25(4-5), 323-43. (DOI:10.1016/s0029-8018(97)00023-1)
  11. Radhakrishnan S, Datla R and Hires RI. 2007. Theoretical and experimental analysis of tethered buoy instability in gravity waves. Ocean Engineering 34, 261-274. (DOI:10.1016/j.oceaneng.2006.01.010)
  12. Umar A and Datta TK, 2003. Nonlinear response of a moored buoy, Ocean Engineering 30, 1625-1646. (DOI:10.1016/s0029-8018(02)00144-0)
  13. White FM. 2003. Fluid mechanics 5th Edition. McGraw-Hill, Korea, 518-532.
  14. Wu WB, Wang JS, Jiang SQ, Xu LB and Sheng LX. 2016. Flow and flow control modeling for a drilling riser system with auxiliary lines. Ocean Engineering 123, 204-222. (DOI: 10.1016/j.oceaneng.2016.06.043)
  15. Williamson CHK and Govardhan R. 1997. Dynamics and forcing of a tethered sphere in a fluid flow. Journal of Fluids and Structures 11, 293-305. (DOI:10.1006/jfls.1996.0078)
  16. Huang S and Herfjord K. 2013. Experimental investigation of the forces and motion responses of two interfering VIV circular cylinders at various tandem and staggered positions. Applied Ocean Research 43, 264-273. (DOI:10.1016/j.apor.2013.10.003).

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