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

The Korean Society of Marine Environment and safety (해양환경안전학회)
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Characteristics of Hypoxic Water Mass Occurrence in the Northwestern Gamak Bay, Korea, 2017

2017년 한국 가막만 북서내만해역 빈산소수괴 발생의 특성

  • Jeong, Hui-Ho (The Graduate School of Environmental and Symbiotic Science, Prefectural University of Kumamoto) ;
  • Choi, Sang-Duk (Department of Aquaculture, College of Fisheries & Ocean Science, Chonnam National University) ;
  • Cho, Hyeon-Seo (Department of Ocean Integrated Science, College of Fisheries & Ocean Science, Chonnam National University)
  • 정희호 (쿠마모토현립대학 환경공생학과) ;
  • 최상덕 (전남대학교 수산해양대학 양식생물학과) ;
  • 조현서 (전남대학교 수산해양대학 해양융합학과)
  • Received : 2021.08.10
  • Accepted : 2021.10.28
  • Published : 2021.10.31
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Abstract

As hypoxia adversely affects the marine environment in northwestern Gamak Bay every summer, the present study determined its comprehensive occurrence mechanisms using the Multiple Regression Analysis (MRA) and suggested management directions based on the primary MRA factors. The first hypoxia occurred by thermocline related to weather conditions, with organic matter deposited inside the bay on 26th June, 2017. Additionally, on 12th July, halocline was also developed by increased rainfall, and the hypoxia was most expanded horizontally and vertically. The primary factors were the stratification and deposited organic matter. In contrast, the hypoxia correlated to phytoplankton growth and deposited organic matter on 8th August was diminished with remarkably less precipitation. However, the stable halocline was caused by massive precipitation, and the reproduced phytoplankton re-generated the expanded hypoxia on 16th August despite a short sampling interval. Subsequently, the hypoxia influenced by the deposited organic matter spread shallowly along the seafloor on 13th September as the extinction period. These results suggest that stratification alleviation technologies, and the improvement and removal of the organic matter deposited on the surface sediment are necessary.

가막만 북서내만해역에서 매년 여름 발생하는 빈산소수괴는 해양환경에 악영향을 미쳐왔다. 따라서, 본 연구는 빈산소수괴 발생시기의 집중적인 현장조사 결과를 바탕으로 다중회귀분석(MRA)을 이용하여 빈산소수괴의 종합적인 발생 메커니즘을 밝혀내고, 그 주요인에 따른 빈산소수괴 관리방안의 방향성을 모색하였다. 그 결과, 2017년 첫 빈산소수괴는 6월 26일에 발생하였으며, 기상 조건에 의한 수온약층의 형성과 퇴적된 유기물의 영향으로 형성되었다. 이어 7월 12일에는 강우량의 증가에 의한 염분약층의 형성으로, 조사 시기 중 빈산소수괴가 수직 및 수평적으로 가장 크게 확장되었다. 그리고, 8월 8일에는 소량의 강우로 빈산소수괴가 크게 약화되었으며, 이때 주 요인은 Chlorophyll-a 농도 증가(식물플랑크톤 증식)과 퇴적된 유기물이었다. 그리고, 약 1주일 후인 8월 16일에는 많은 강우량에 기인한 매우 안정된 염분약층과 Chlorophyll-a 농도 증가(식물플랑크톤 증식)에 의해 크게 확장된 빈산소수괴가 재발생하였다. 이후 9월 13일의 빈산소수괴 소멸시기에서는 빈산소수괴가 해저 면을 따라 얕게 확장되었으며, 퇴적된 유기물에 의해 주로 영향을 받은 것으로 나타났다. 이는 빈산소수괴 관리를 위해서는 퇴적된 유기물의 개선뿐만 아니라 성층의 완화 기술이 필요함을 암시하였다.

Keywords

Acknowledgement

이 논문은 2017년도 국립수산과학원 수산시험연구사업인 남해연안어업 및 환경생태 조사(R2017032)의 지원으로 수행된 연구입니다. 조사 및 도움을 주신 많은 분들께 감사의 말씀드립니다.

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