한국수산과학회지 (Korean Journal of Fisheries and Aquatic Sciences)

  • 제37권2호
  • /
  • Pages.159-169
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  • 2004
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  • 0374-8111(pISSN)
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  • 2287-8815(eISSN)
한국수산과학회 (The Korean Society of Fisheries and Aquatic Science)
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한국 남동해역 내대륙붕 세립퇴적물의 분포 및 퇴적작용

Sedimentation and Distribution Pattern of the Fine-grained Sediments in the Southeastern Inner Shelf of Korea

  • 유동근 (한국지질자원연구원 석유해저연구부) ;
  • 김길영 (한국해양대학교 해양과학기술연구소) ;
  • 이호영 (한국지질자원연구원 석유해저연구부) ;
  • 서영교 (부경대학교 환경탐사공학과) ;
  • 박수철 (충남대학교 해양학과) ;
  • 김대철 (부경대학교 환경탐사공학과)
  • YOO Dong Geun (Petroleum and Marine Resources Division, Korea Institute of Geoscience & Mineral Resources (KIGAM)) ;
  • KIM Gil Young (Research Institute of Marine Science & Technology, Korea Maritime University) ;
  • LEE Ho Young (Petroleum and Marine Resources Division, Korea Institute of Geoscience & Mineral Resources (KIGAM)) ;
  • SEO Young Kyo (Department of Environmental Exploration Engineering, Pukyong National University) ;
  • PARK Soo Chul (Department of Oceanography, Chungnam National University) ;
  • KIM Dae Choul (Department of Environmental Exploration Engineering, Pukyong National University)
  • 발행 : 2004.04.01
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초록

Sedimentation and depositional pattern of the fine-grained sediments in the southeastern inner shelf of Korea were studied using a very high-resolution seismic profiles and sediment data. The recent mud deposits up to 45 m thick are distributed in the inner shelf forming a nearshore belt from the eastern part of Geoje Island to off the Pohang along the coast. The sediment in this area consists of homogeneous mud with mean grain size between $8.6\;to\;5.3\phi$ and does not show any distinct variability It gradually becomes finer and well sorted northeastward along the coast. Sediments normally appear as structureless massive mud but X-radiographs show that some bioturbation and faint lamination are present. The sediments accumulate at a rate of 0.18-0.44 cm/yr and the rate coincides well with the long-term (a 1000-year scale) accumulation based on very high-resolution seismic data. Distribution of wet bulk density and velocity shows a gradual increase from the southeastern part of Ulsan to off Pohang, whereas porosity shows a reverse pattern. Correlations between velocity and porosity/mean grain size are different from other regions compared, due to the difference of sediment texture and sedimentary environment. The recent shelf deposits are seismically characterized by three distinct facies: 1) well-stratified (near the river mouth), 2) semi-transparent (eastern part of Geoje Island), and 3) transparent (off Ulsan). The results suggest that fine-grained sediment derived from rivers, forming a nearshore mud belt, have been transported northeastward by the northeastward-flowing coastal current.

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피인용 문헌

  1. Tectonic evolution and depositional environments of Jeju and Socotra basins in the southernmost continental shelf of the South Sea, Korea vol.52, pp.3, 2016, https://doi.org/10.14770/jgsk.2016.52.3.355
  2. 고해상도 탄성파 자료를 이용한 부산 수영만의 퇴적층서 연구 vol.14, pp.2, 2004, https://doi.org/10.7846/jkosmee.2011.14.2.081