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

Abstract − Seawater quality was investigated each month at 30 stations near Tongyeong, South Korea, to pro-vide 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 tem-perature below 4 o C nor fish damage caused by low water temperature was observed. Salinity ranged from 24.04to 34.39 psu in the surface layer and from 29.92 to 34.39 psu in the bottom layer. The minimum salinity, attrib-utable to rainfall events, was observed in July; salinity increased to high of about 34 psu in November. Lowdissolved 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 toFebruary. 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 anal-ysis based on environment factors related to water quality, the study area could be divided into three main seaareas: Buksin Bay, coastal seawater, and offshore seawater. Buksin Bay was characterized by low salinity, highDO and Chl. a, and high transparency in the surface layer and by low DO and high NH