Journal of the Korean Society for Marine Environment & Energy (한국해양환경ㆍ에너지학회지)

The Korean Society for Marine Environment and Energy (한국해양환경•에너지학회)
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Factors Controlling Temporal-Spatial Variations of Marine Environment in the Seomjin River Estuary Through 25-hour Continuous Monitoring

25시간 연속관측을 통한 섬진강 하구에서 시공간적 해양환경 변화 조절 요인

  • Park, Mi-Ok (Climate & Marine Environment Team, Korea Marine Environment Management Corporation) ;
  • Kim, Seong-Soo (Climate & Marine Environment Team, Korea Marine Environment Management Corporation) ;
  • Kim, Seong-Gil (Climate & Marine Environment Team, Korea Marine Environment Management Corporation) ;
  • Kwon, Jinam (Marine Environment Research Division, National Fisheries Research & Development Institute) ;
  • Lee, Suk-Mo (College of Ecological Engineering, Pukyong National University) ;
  • Lee, Yong-Woo (Climate & Marine Environment Team, Korea Marine Environment Management Corporation)
  • 박미옥 (해양환경관리공단 기후수질팀) ;
  • 김성수 (해양환경관리공단 기후수질팀) ;
  • 김성길 (해양환경관리공단 기후수질팀) ;
  • 권지남 (국립수산과학원 어장환경과) ;
  • 이석모 (부경대학교 생태공학과) ;
  • 이용우 (해양환경관리공단 기후수질팀)
  • Received : 2012.08.03
  • Accepted : 2012.11.16
  • Published : 2012.11.25
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Abstract

In order to elucidate temporal variations of temperature, salinity, pH, dissolved oxygen (DO), suspended particulate matter (SPM), dissolved inorganic nutrients, and chlorophyll a, we performed 25-hour continuous monitoring in the Seomjin River Estuary in March (dry season) and July (rainy season) 2006. We also investigated spatial variations of marine environmental parameters across a saline gradient. In the Seomjin River Estuary, continuous monitoring results revealed that salinity variations were mainly affected by tidal cycle in the dry season and by river discharge in the rainy season. In the dry season, the spatio-temporal distribution of dissolved inorganic nutrient (nitrate, nitrite, and silicate) concentrations showed a good correlation with tidal cycle. While nutrient concentrations in rainy season showed not much variance in time. There were 6 and 4 times higher dissolved inorganic nitrogen and phosphorus concentrations in the rainy season than those in the dry season, respectively. Silicate concentration was 43 times higher in the rainy season than that in the dry season. Chlorophyll a concentration was higher in the dry season than that in the rainy season showing high nutrient concentrations. The results of this study, spatio-temporal variations of marine environmental factors are determined by both tidal cycle and river discharge. It seems that chlorophyll a concentration is related to the river discharge than dissolved inorganic nutrient distribution.

섬진강 하구에서 수온, 염분, pH, 용존산소, 부유입자물질, 영양염류, 엽록소 a의 시간에 따른 변화 양상을 파악하기 위해서 2006년 3월(건기)과 7월(우기)에 각각 25시간 연속관측을 실시하였다. 또한 공간적인 분포특성을 파악하기 위해서 염분경사에 따라 해양환경 조사를 실시하였다. 섬진강 하구에서 염분의 변화는 건기에는 조석주기, 우기에는 강물 유출량에 영향을 받는 것으로 나타났다. 용존무기영양염류(질산염, 아질산염, 규산염) 농도의 시공간적 분포는 건기에는 염분의 변화와 좋은 상관관계를 보였다. 반면 우기에는 시간에 따라 농도 변화가 작았다. 우기시 영양염류의 평균 농도는 건기에 비해 용존무기질산염의 경우 약 6배, 용존무기인의 경우 약 4배, 용존무기규산염의 경우 약 43배 높게 나타났다. 엽록소 a 농도는 용존무기영양염류의 농도가 높은 우기에 비해 건기에 높게 나타났다. 이 연구결과, 우기와 건기에 해양환경인자의 시공간적 분포는 조석과 강물유출량의 영향에 의해 결정되며, 엽록소 a의 분포는 용존무기영양염류의 분포보다는 담수의 유출량 변화와 연관성이 있는 것으로 판단된다.

Keywords

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