Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Evaluation of Correction Parameter for the Free-fall Grab Based Mn Nodule Abundance in the Southern Sector of the KODOS

KODOS 남쪽광구에서 자유낙하식 채취기로 채취된 망간단괴 부존률 평가를 위한 보정상수 검증

  • Lee, Hyun-Bok (Deep-sea & Marine Georesources Research Department, KORDI) ;
  • Ko, Young-Tak (Deep-sea & Marine Georesources Research Department, KORDI) ;
  • Kim, Jong-Uk (Deep-sea & Marine Georesources Research Department, KORDI) ;
  • Chi, Sang-Bum (Deep-sea & Marine Georesources Research Department, KORDI) ;
  • Kim, Won-Nyon (Deep-sea & Marine Georesources Research Department, KORDI)
  • 이현복 (한국해양연구원 심해.해저자원연구부) ;
  • 고영탁 (한국해양연구원 심해.해저자원연구부) ;
  • 김종욱 (한국해양연구원 심해.해저자원연구부) ;
  • 지상범 (한국해양연구원 심해.해저자원연구부) ;
  • 김원년 (한국해양연구원 심해.해저자원연구부)
  • Received : 2011.11.01
  • Accepted : 2011.12.05
  • Published : 2011.12.28
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Abstract

Quantitative estimate of manganese nodules based on the operation of a free fall grab (FFG) needs to be corrected because of its less retrieval ability. Previously, the correction parameter of the nodule abundance collected by FFG was calculated based on the image analysis of the photos of bottom sediment in the northern sector of the nodule exploration area of Korea in the NE equatorial Pacific. However, nodules in the southern sector are commonly covered by sediment, which may prevent the use of the correction parameter estimated by photographic techniques. In this study, we attempted dual nodule sampling at the same location by different equipments (i.e. box corer (BC) and FFG) to examine the previous correction parameter of nodule abundance for FFG operation. During the exploration cruises in 2007 to 2009, Mn-nodules were collected from 40 stations both by BC and FFG in the southern sector. The correlation analysis between BC and FFG operations revealed that the BC collected nodules 1.43 times larger than FFG. Our result suggests that the correction parameter of 1.43 can be applied for collection of FFG data to estimate Mn-nodule distribution in the southern sector. The obtained parameter is similar to the previous parameter (1.42~1.45) calculated by the image analysis method, indicating an usefulness of new correction parameter suggested by this study.

자유낙하식 망간단괴 채취기 (FFG)는 정점의 해저면에 분포하는 망간단괴를 모두 채취하기 어렵기 때문에 망간단괴의 부존률을 평가할 때 반드시 보정해서 사용해야 한다. 북동태평양에 위치한 대한민국의 망간단괴 광구 중에서 북쪽광구의 보정상수는 이미 해저면 영상분석으로 결정되어 있다. 그러나 남쪽광구는 망간단괴가 퇴적물에 피복되어 있어서 영상분석에의한 부존률 평가에 지장을 받을 가능성이 있다. 이번 연구에서는 과거에 남쪽광구에서 FFG로 획득한 부존률 자료에 사용한 보정상수를 검증하기 위하여 2007~2009년에 상자형 시료 채취기와 FFG를 동시에 운영하여 40개의 정점자료를 획득하였다. BC와 FFG의 상관분석을 통하여 BC가 FFG에 비하여 1.43배 부존률이 크게 나타났으며, 이것은 남쪽광구에서 실제 망간단괴 분포를 평가하기 위해서는 FFG 자료에 1.43의 보정상수를 곱해서 사용해야 되는 것을 의미한다. 이번에 획득한 보정상수는 기존에 영상분석을 통해 얻은 보정상수(1.42~1.45)와 유사한 결과로서 남쪽광구에서 사용할 보정상수가 검증되었다고 판단된다.

Keywords

References

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