JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Review of Recovery Efficiency for Modified Free-fall Grab
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
  • Journal title : Ocean and Polar Research
  • Volume 26, Issue 2,  2004, pp.361-365
  • Publisher : Korea Institute of Ocean Science & Technology
  • DOI : 10.4217/OPR.2004.26.2.361
 Title & Authors
Review of Recovery Efficiency for Modified Free-fall Grab
Lee, Gun-Chang; Chi, Sang-Bum; Park, Cheong-Kee; Yoo, Chan-Min; Ko, Young-Tak; Ham, Dong-Jin;
  PDF(new window)
 Abstract
Deep-sea Resources Research Center (DRRC) has been using a free-fall grab (FFG) for the resource evaluation of polymetallic nodules in the KODOS (Korea Deep Ocean Study) area, NE Pacific, since 1992. A FFG model (Model 4200, Benthos) adapting one glass buoy system (diameter 17 inch, net buoyance 25.4 kg) has been used until 1993. Since then, DRRC has carried out a study to increase the recovery rate of FFG and it was found that a revised system adapting an additional buoy (diameter 10 inch, net buoyance 4.5 kg) gives improved results. The nodule sampling tests were performed using two different models for the same study area and the resulting recovery rates were compared. The result shows no distinct difference in recovery time between two models, but average recovery rate of the revised model was increased to 99.44% from 96.06% of the original model.
 Keywords
free-fall grab;recovery rate;
 Language
Korean
 Cited by
 References
1.
일본 금속광업사업단. 1995. 1994년도 망간단괴 채광 환경조사 보고서. 203 p.

2.
지상범, 어영상, 정회수, 박동원, 이근창. 1995. 피스톤식 자유낙하 주상시료 채취기. 한국해양학회지. 30(4), p. 365-370.

3.
통상산업부. 1995. 95 태평양 광물자원탐사 보고서. 763p.

4.
해양수산부. 1996. 96 심해저 광물자원탐사 보고서. 954p.

5.
Fellerer, R.M. 1986. Exploration, Mining, and Processing. p. 167-208. In: The manganese nodule belt of the Pacific Ocean. eds. by P. Halbach, G. Friedrich, U. von Stackelberg. Ferdinand Enke Verlag Stuttgart, Stuttgart.

6.
Pluger, W.L. and H. Kunzendorf. 1986. Marine geochemical exploration method. p. 121-156. In: Marine mineral exploration. ed. by H. Kunzendorf. Elsevir, Amsterdam.