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http://dx.doi.org/10.7846/JKOSMEE.2015.18.2.51

The Long-term Variations of Water Qualities in the Saemangeum Salt-Water Lake after the Sea-dike Construction  

Jeong, Yong Hoon (Department of Oceanography, Kunsan National University)
Yang, Jae Sam (Department of Oceanography, Kunsan National University)
Publication Information
Journal of the Korean Society for Marine Environment & Energy / v.18, no.2, 2015 , pp. 51-63 More about this Journal
Abstract
In order to investigation long-term variations of water qualities in the Saemangeum Salt-Water Lake formed after the sea-dike construction, the survey has carried out over 40 time from 2002 to 2010. The decreased salinity in surface water immediately after the dike construction has maintained on equal terms for years. After the dike construction, the early concentration of SPM in surface water has decreased but then it showed the tendency to move up and down due to the changes of water level in the lake. The elevated concentration of Chl-a in surface water initially after the dike construction was kept at the same conditions for years. The concentration of DIN in surface water has not changed before and shortly after the dike construction. However, the concentration of $NH_4-N$ in surface water has increased steadily after the dike construction. Consequently the concentration of DIN in the lake water after years has raised compared to pre-dike construction. The reduced concentration of DIP in surface water soon after the dike construction has increased after years as well as $NH_4-N$ due to the accumulation of organic matter to inside lake. Unlike with the unvaried $NO_3-N$, the concentration of DISi in surface water after the dike construction has immediately increased and maintained the enhanced level indicating the supply from other sources except the freshwater. Since the dike construction, the spatial characteristics of water quality was divided river sides and rest of the lake markedly. Stratification of river sides was more strong than the dike sides. In the warm seasons, hypoxia causing the release of nutrients and metals from sediment was observed downward about 1 m from surface of river sides. We strongly suggest to make some urgent measure to prevent low dissolved oxygen condition in the bottom layer of the river sides.
Keywords
Saemangeum Salt-Water Lake; water quality; stratification; hypoxia;
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Times Cited By KSCI : 4  (Citation Analysis)
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