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KMID : 1024520190280030357
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Journal of the Environmental Sciences
2019 Volume.28 No. 3 p.357 ~ p.369
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Water Quality Level of the Living Environmental Standards and Regression Analysis in the Major Tributaries of the Nakdong River
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Kang Dong-Hwan
So Yoon-Hwan
Park Kyeong-Deok
Kim Il-Kyu
Kim Byung-Woo
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Abstract
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In this study, the water quality components (pH, BOD, COD, TOC, SS, DO, TP) and the water quality, observed for 10 years (2008~2017) in the five tributaries of the Nakdong River with the highest flow rates, were analyzed. Monthly levels of the water quality components were estimated and regression functions were used to quantitatively explain the changes in the BOD and COD components, with respect to the TOC components. The results of analyzing the water quality levels in terms of the living environmental standards show that the lowest water quality was observed midstream (ST-3) and the highest water quality was observed upstream (ST-1 and ST-2). The regression function was estimated to be a linear function in all five tributaries, and the goodness of fit of the function was high upstream (ST-2), midstream (ST-3), and downstream (ST-4). According to the regression analysis using the observation data from 2008~2017, we found that the consumption of dissolved oxygen increased with an increase in organic matter in the major tributaries of the Nakdong River.
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KEYWORD
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Nakdong river, Major tributaries, Water quality level, Regression analysis
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