물 교환이 제한적인 시화호 상류 기수역에서 기초수질의 시공간적 분포특성 (Temporal and Spatial Distributions of Basic Water Quality in the Upper Regions of Brackish Lake Sihwa with a Limited Water Exchange)

서지정보

· 발행기관 : 한국수생태학회
· 수록지 정보 : 생태와 환경 / 41권 / 2호 / 206 ~ 215페이지
· 저자명 : 최광순, 김세원, 김동섭, 오영택, 허우명, 이윤경, 박용순

초록

Temporal and spatial distributions of salinity, temperature, dissolved oxygen (DO),
and turbidity were investigated at seven sites in the upper regions of brackish Lake
Sihwa with a limited water exchange, from March to October 2005. During the study
period, salinity and temperature varied 0.1~29.9 psu and 4.7~28.1 C, respectively,
depending on seasons and sites sampled. A distinct halocline profile showing the
maximum density gradient (difference over 20 psu m-1 between surface and bottom
layers) was observed during the rainy season, due to the decrease of salinity in surface
layers by freshwater inflow. This result implies that rainfall event is the important
factor forming the halocline. On the other hand, the depth and location of
halocline varied with the amount of seawater through the sluice gates and the
operation systems (inflow or outflow). High DO (over 300% saturation) was observed
at surface layer above the halocline in April when red tide occurred, whereas low
DO (below 20% saturation) was at the bottom layer below the halocline in the rainy
season. Turbidity ranged 1.5~86.3 NTU showing the maximum turbidity at the
layers above or upper the halocline. As a result, the distributions of DO and turbidity
in the upper regions of brackish Lake Sihwa were largely affected by the variation
of salinity. Also, when the halocline was formed, the water quality between upper
and lower water layers may be expected completely different. This study suggests
that the physicochemical characteristics of water in the brackish regions are
closely associated with the causes of eutrophication such as red tide and DO deficit.

영어초록

Temporal and spatial distributions of salinity, temperature, dissolved oxygen (DO),
and turbidity were investigated at seven sites in the upper regions of brackish Lake
Sihwa with a limited water exchange, from March to October 2005. During the study
period, salinity and temperature varied 0.1~29.9 psu and 4.7~28.1 C, respectively,
depending on seasons and sites sampled. A distinct halocline profile showing the
maximum density gradient (difference over 20 psu m-1 between surface and bottom
layers) was observed during the rainy season, due to the decrease of salinity in surface
layers by freshwater inflow. This result implies that rainfall event is the important
factor forming the halocline. On the other hand, the depth and location of
halocline varied with the amount of seawater through the sluice gates and the
operation systems (inflow or outflow). High DO (over 300% saturation) was observed
at surface layer above the halocline in April when red tide occurred, whereas low
DO (below 20% saturation) was at the bottom layer below the halocline in the rainy
season. Turbidity ranged 1.5~86.3 NTU showing the maximum turbidity at the
layers above or upper the halocline. As a result, the distributions of DO and turbidity
in the upper regions of brackish Lake Sihwa were largely affected by the variation
of salinity. Also, when the halocline was formed, the water quality between upper
and lower water layers may be expected completely different. This study suggests
that the physicochemical characteristics of water in the brackish regions are
closely associated with the causes of eutrophication such as red tide and DO deficit.

참고자료

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