The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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A Study on Geotechnical Properties of Deep-Sea Sediments, NE Equatorial Paciflc of KODOS Area

북동태평양 KODOS 지역 심해저 퇴적물의 지질공학적 특성

  • Kim, Ki-Hyun (Deep-Sae Resources Research Center, Korea Ocean Research & Development Institute) ;
  • Moon, Jai-Woon (Deep-Sae Resources Research Center, Korea Ocean Research & Development Institute) ;
  • Lee, Kyeong-Yong (Deep-Sae Resources Research Center, Korea Ocean Research & Development Institute) ;
  • Son, Seung-Kyu (Deep-Sae Resources Research Center, Korea Ocean Research & Development Institute) ;
  • Oh, Jae-Kyung (Department of Oceanography, Inha University) ;
  • Chi, Sang-Bum (Deep-Sae Resources Research Center, Korea Ocean Research & Development Institute)
  • 김기현 (한국해양연구소 심해저자원연구센터) ;
  • 문재운 (한국해양연구소 심해저자원연구센터) ;
  • 이경용 (한국해양연구소 심해저자원연구센터) ;
  • 손승규 (한국해양연구소 심해저자원연구센터) ;
  • 오재경 (인하대학교 해양학과) ;
  • 지상범 (한국해양연구소 심해저자원연구센터)
  • Published : 2000.11.30
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Abstract

Deep-sea surface sediment were analyzed for their geotechnical properties, and the sediment samples were collected with a multiple-corer from 31 stations along the track line (131$^{\circ}$30'W, 5-12$^{\circ}$N) in the northeast equatorial Paciflc. Most of the sediments from the northern part (8-12$^{\circ}$N) showed typical properties of siliceous sediments, whereas the southern part (5-6$^{\circ}$N) showed calcareous characteristics due to high biogenic carbonate productivity in the surface waters, where its water depth was shallower than the carbonate compensation depth (CCD: 4,400 m). Geotechnical properties changed sharply at the boundary of 7$^{\circ}$N. Calcareous sediments from the southern part had low water contents, low porosity, low shear strength, high bulk density and high specific grain density, whereas siliceous sediments from the northern part attained high water content, high porosity, high shear strength, low bulk density and low specific grain density. Higher sediment activities were observed in the northern sediment samples than the southern sediment samples. The core samples of the northern sediments were divided into a semi-liquid upper layer and a consolidated lower layer with a boundary at 5-8 cm. These sediment samples showed a rapid increasing pattern along the downcore in original shear strength when an opposite trend was observed in the southern samples. The results showed that sediment variabilities in geotechnical properties between the northern and southern parts such as productivities of surface water, grain solubility due to water depth variation, sedimentation rate, erosion and redistribution of sediment, and combined sedimentary processes were distinctly different along the latitude.

북동 태평양의 위도별(131$^{\circ}$30'W, 5${\sim}$12$^{\circ}$N) 각 지점에서 다중 주상시료 채취기(multiple corer)로 획득된 31개 표층 퇴적물의 지질공학적 특성을 분석하였다 환경연구지역을 포함한 연구지역 북부(9${\sim}$12$^{\circ}$N)퇴적물은 대부분 규질퇴적상을 보인다. 반면 남쪽지역(5${\sim}$6$^{\circ}$N)에서는 탄산질 퇴적물이 산출되는데, 이는 수층 생산성이 높고 이 지역 탄산염 보상심도(CCD: 4,400 m)보다 수심이 얕은데 기인된 결과이다. 지질공학적 특성은 7$^{\circ}$N을 경계로 남-북 퇴적물간 뚜렷한 차이를 보인다. 남쪽지역의 탄산질 퇴적물은 낮은 함수율, 공극율, 전단강도, 그리고 높은 입자 밀도 및 전밀도의 원인이 된다. 반면에 망간단괴가 고밀도로 분포하고 있는 북쪽지역 퇴적물은 주로 생물기원 규질 퇴적물로 구성되어 있으며, 이는 높은 함수율, 공극율, 전단강도 그리고 낮은 입자 밀도 및 전밀도의 일반적 원인이 된다. 퇴적물의 활성도(activity)는 북쪽 퇴적물에서 매우 높게 나타난다. 한편, 북쪽지역 퇴적물들은 표층에서 약 5${\sim}$8 cm를 경계로 준액상(semi-liquid)인 상부층과 단단하게 굳어진 하부층으로 뚜렷이 구분되며, 깊이에 따라 급격한 지질공학적 특성 변화를 보인다. 반면 남쪽 지역에서는 이러한 깊이에 따른 지질공학적 특성 변화가 적다. 이러한 남-북 지역 퇴적물중 지질공학적 특성의 위도별, 깊이별 변화는 탄산질 퇴적물과 규질 퇴적물의 분포, 수층의 생산성 및 수심변화에 따른 용해도와 퇴적을 차이 그리고 침식 및 재퇴적작용 등 퇴적 과정이 위도별로 달랐기 때문으로 판단된다.

Keywords

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