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

The Korean Society of Marine Environment and safety (해양환경안전학회)
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Seasonal Variations in Seawater Quality Due to Freshwater Discharge in Asan Bay

담수유입으로 인한 아산만 해양수질의 계절적인 변동

  • Jeong, Yong Hoon (SERC, Kunsan National University) ;
  • Cho, Min Kyun (Department of Oceanography, Kunsan National University) ;
  • Lee, Dong Gi (Department of Oceanography, Kunsan National University) ;
  • Doo, Sun Min (Department of Marine Biotechnology, Kunsan National University) ;
  • Choi, Hyun Soo (Department of Marine Biotechnology, Kunsan National University) ;
  • Yang, Jae Sam (Department of Marine Biotechnology, Kunsan National University)
  • 정용훈 (군산대학교 새만금환경연구센터) ;
  • 조민균 (군산대학교 해양학과) ;
  • 이동기 (군산대학교 해양학과) ;
  • 두선민 (군산대학교 해양생물공학과) ;
  • 최현수 (군산대학교 해양생물공학과) ;
  • 양재삼 (군산대학교 해양생물공학과)
  • Received : 2016.05.16
  • Accepted : 2016.08.29
  • Published : 2016.08.31
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Abstract

In order to understand the seasonal characteristics of seawater in Asan Bay, the quality of this water was observed over four seasons form December 2011 to February 2013, and correlations between seawater quality variations and freshwater input were analyzed by a statistical method. The results, based on factor analysis, indicate that the two most important factors in understanding variation are freshwater input (37.7 %) and seawater exchange (24.4 %). Asan-ho and Sapgyo-ho are two major freshwater sources that affect inner (eastern) Asan Bay. Discharged freshwater from the inner bay strongly affects the spatial and temporal distribution of seawater in the bay overall during the summer rainy season. On other hand, water re-suspended from the bottom of the bay overwhelmed the water quality during the dry winter season. In conclusion, seasonal freshwater discharge dominated the water quality of the bay, and, consequently, DIP limited the growth of phytoplankton in the bay.

아산만의 해양수질의 계절적인 변화를 이해하기 위하여 2011년 12월부터 2013년 2월까지 4계절 동안 수질을 관찰하고, 담수유입으로 인한 해양수질 변화 관계를 통계적인 기법으로 분석하였다. 아산만의 해양수질 자료에 대한 요인분석 결과는 해양수질 변화를 주도하는 가장 중요한 요인은 담수유입(37.7 %)이며, 그 다음으로는 외해수의 영향(24.4 %)으로 나타났다. 아산만에서 담수의 주요 공급원은 만의 가장 안쪽에 위치한 아산호와 삽교호이며, 이들의 방류로 인해 아산만의 전체적인 수질의 공간 분포가 결정되는 것으로 보인다. 반면 담수 방류가 적은 겨울철에는 저층 재부유에 기인한 영향이 상대적으로 중요해진다. 전체적으로 담수 방류량의 계절적인 변화가 아산만 전체의 환경변화를 주도하고 있으며, 이로 인하여 DIP가 식물플랑크톤의 성장을 제한하는 요소로 나타났다.

Keywords

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