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http://dx.doi.org/10.7846/JKOSMEE.2011.14.3.154

Spatial Distributions and Monthly Variations of Water Quality in Coastal Seawater of Tongyeong, Korea  

Lee, Young-Sik (Southeast Sea Fisheries Research Institute, NFRDI)
Lim, Weol-Ae (Southeast Sea Fisheries Research Institute, NFRDI)
Jung, Chang-Su (Southeast Sea Fisheries Research Institute, NFRDI)
Park, Jong-Soo (West Sea Fisheries Research Institute, NFRDI)
Publication Information
Journal of the Korean Society for Marine Environment & Energy / v.14, no.3, 2011 , pp. 154-162 More about this Journal
Abstract
Seawater quality was investigated each month at 30 stations near Tongyeong, South Korea, to provide data for the effective use of coastal fisheries and the reduction of economic damage to marine products. Water temperature was lowest in January and highest at the end of August. Neither extremely low water temperature below $4^{\circ}C$ nor fish damage caused by low water temperature was observed. Salinity ranged from 24.04 to 34.39 psu in the surface layer and from 29.92 to 34.39 psu in the bottom layer. The minimum salinity, attributable to rainfall events, was observed in July; salinity increased to high of about 34 psu in November. Low dissolved oxygen (DO), below 4 mg/L, was observed at Wenmun and Buksin Bays during May to October. Concentrations of $NO_2$-N, $NO_3$-N, and $PO_4$-P were low from March to September and high from October to February. Transparency was 6 m on average and was high in Wenmun Bay. Chemical oxygen demand (COD) and chlorophyll a (Chl. a) were high during summer, when the water temperature was high. With cluster analysis based on environment factors related to water quality, the study area could be divided into three main sea areas: Buksin Bay, coastal seawater, and offshore seawater. Buksin Bay was characterized by low salinity, high DO and Chl. a, and high transparency in the surface layer and by low DO and high $NH_4$-N in the bottom layer. Offshore seawater had high salinity and $NO_3$-N and low Chl. a concentration. In summer season that oyster need lots of phytoplankton, $NO_3$-N and Chl. a concentrations at this study area were low compare to Gwangy-ang and Gamak Bays. In winter, a sea squirt swallow much more than other season, the Chl. a concentrations were also low than Gwangyang and Gamak Bays.
Keywords
Chl. a; Cluster Analysis; Water Quality; Tongyeong Coastal Water;
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Times Cited By KSCI : 8  (Citation Analysis)
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