Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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Hypoxia and Characteristics of Nutrient Distribution at the Bottom Water of Cheonsu Bay Due to the Discharge of Eutrophicated Artificial Lake Water

간척지 내 부영양화된 호수 수괴의 간헐적 유출로 인한 천수만 저층수의 Hypoxia 발생과 영양염 분포 특성

  • Lee, Dong-Kwan (Department of Oceanograhpy and Ocean Environmental Sciences, Chungnam National University) ;
  • Kim, Ki-Hyun (Department of Oceanograhpy and Ocean Environmental Sciences, Chungnam National University) ;
  • Lee, Jae-Sung (Korea Institute of Ocean Science & Technology)
  • 이동관 (충남대학교 해양환경과학과) ;
  • 김기현 (충남대학교 해양환경과학과) ;
  • 이재성 (한국해양과학기술원)
  • Received : 2016.10.27
  • Accepted : 2016.12.28
  • Published : 2016.12.31
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Abstract

In summer 2010, we measured the concentration of dissolved oxygen (DO) and nutrients in the water collected at the bottom of Cheonsu Bay, off the west coast of Korea. We also measured nutrient fluxes across the sediment-water interface by deploying a fully-automated benthic lander, which collected time-series water samples inside a benthic chamber. We confirmed on-going hypoxia in the northern parts of the bay where polluted lake water was discharged. DO content in the water at the bottom was 2 mg/l, compared to 5 mg/l at the mouth of the bay in the south. Nutrient concentrations showed a trend that was opposite to that of DO. The variation of N/P ratios implies phosphate desorption and a release of nutrients caused by hypoxia. The organic carbon oxidation rate and oxygen consumption rate in the northern parts of the bay were about twice as fast as those at the mouth of the bay. Benthic fluxes of nutrients in the northern part of the bay were 4 to 6 times higher than those at the mouth. Our results imply that it is important to understand the role of hypoxia events to make an accurate estimation of material fluxes across the sediment-water interface.

본 연구에서는 2010년 여름에 천수만에서 저층해수를 채집하여 용존산소와 영양염 농도를 측정하였다. 또한 benthic chamber내의 해수시료를 시계열로 채집하는 자동화된 Benthic Lander를 설치하여 해수-퇴적물간 영양염 플럭스를 측정하였다. 오염된 인공호수 유출수가 들어오는 천수만 북쪽에서는 저층수의 용존산소는 2 mg/l로 hypoxia의 존재 가능성이 확인되었다. 반면 남쪽 천수만 입구의 저층 용존산소는 5 mg/l이었다. 영양염은 용존산소와 반대의 분포 경향을 보였고, N/P ratio의 변화는 hypoxia에 의해 발생된 인산염의 탈착과 용출 때문으로 보인다. 만 북쪽 해역의 유기탄소 산화율과 산소소비율은 남쪽 만 입구 해역보다 약 2배 큰 값을 보였고, 영양염 benthic flux는 천수만 북쪽에서 4내지 6배 높았다. 이러한 결과는 해수-퇴적물간 물질 플럭스를 정확히 추정하기 위해서는 hypoxia의 역할에 대한 이해가 중요하다는 점을 시사해준다.

Keywords

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