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http://dx.doi.org/10.4491/KSEE.2017.39.2.89

Analysis of Water Quality factor and Correlation between Water Quality and Chl-a in Middle and Downstream Weir Section of Nakdong River  

Jung, Sun-Young (Department of Environmental Engineering, Pukyoug National University)
Kim, Il-Kyu (Department of Environmental Engineering, Pukyoug National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.39, no.2, 2017 , pp. 89-96 More about this Journal
Abstract
This study analyzed the characteristics of water quality and the correlation between Chl-a and water quality factors among four weirs located in the middle and downstream of Nakdong River for five years. The concentration of nutrients and Chl-a from DS to CH was higher than that of GG, which is considered to be due to the influx of Kumho River located at upstream of DS. There was a significant correlationship between Chl-a and most of the water quality factors for all season data. Based on the comparison results between all season data and summer season data, a negative correlation between Chl-a and nutrients ($PO_4-P$, $NH_3-N$) was increased. Based on analysis on summer in 2015 with relatively low precipitation and high algal blooms, the correlation between Chl-a and $PO_4-P$ at all sites were increased. Therefore phosphorus is an important factor in the river on summer season. And PCA results showed the first factor was classified as T-N, $NO_3-N$ for all seasons, and the first factor was classified as T-P, $PO_4-P$ for summer seasons. Consequently, the middle and downstream of Nakdong River were most affected by nutrients, especially it was affected by phosphorous pollutants rather than nitrogen pollutants during summer seasons.
Keywords
Nakdong River Middle and Downstream; Chl-a; Nutrients; Multivariate Statistical Analysis;
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Times Cited By KSCI : 11  (Citation Analysis)
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