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http://dx.doi.org/10.17663/JWR.2017.19.4.383

Estimation of Eutrophication during Summer and Fall in Danghang Bay  

Kim, Sung Jae (Department of Marine Environmental Engineering, College of Marine Science, Gyeongsang National University)
Yoo, Young Jin (Department of Marine Environmental Engineering, College of Marine Science, Gyeongsang National University)
Publication Information
Journal of Wetlands Research / v.19, no.4, 2017 , pp. 383-392 More about this Journal
Abstract
In 2013, August and September(early) as summer and October and November as Fall the probe of eutrophication has been done at 22 sampling points from the entrance of Danghang Bay (Jinhae Bay) to Geosan reservoir. In Danghang Bay, total chlorophyll(TChl) concentration of summer was 3.7 times higher than that of fall, and sampling points closer to the center showed 1.8 times higher concentrations than sampling points near the fringe where fresh water encountered. Eutrophication Index(EI) exceeded 1 at all sampling points in Danghang Bay during summer and fall, and if other conditions for algae growth met there was a possibility red tide to bloom at any place. There was a tendency of EI to gradually increase moving up from the entrance of bay to the inner side during summer and fall. Especially there was a sudden increase by 2.3 times higher at sampling points of 13~22 (planned region as Madong reservoir) than at other points during fall. Nitrogen was a limiting nutrient for growth of algae during summer and fall in Danghang Bay, but phosphorus was a limiting nutrient during summer rainy season. During summer and fall, multiple linear regression analysis between EI and COD, DIN, and DIP showed a significant positive relationship and that DIP was the most effective variable. Whereas multiple linear regression analysis between TChl and COD, DIN, DIP, and DSi showed a significant positive relationship and that DIP was also the most effective variable during summer. There was no significant correlation between TChl and the other parameters during fall.
Keywords
Danghang Bay; COD; DIN; DIP; eutrophication index; limiting nutrient multiple linear regression equation;
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