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KMID : 1024520160250060767
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Journal of the Environmental Sciences
2016 Volume.25 No. 6 p.767 ~ p.787
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Evaluation of Water Quality Characteristics and Water Quality Improvement Grade Classification of Geumho River Tributaries
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Jung Kang-Young
Ahn Jung-Min
Kim Kyo-Sik
Lee In-Jung
Yang Duk-Seok
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Abstract
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In this study, we analyzed on-site monitoring data for 15 tributaries in Geumho watersheds for 3 years (2011-2013) in order
to sort out priorities on water quality characteristics and improvement. As a result of estimating contribution to contamination of the tributary rivers, Dalseocheon showed the highest load densities, despite the smallest watershed area, with 22.7% BOD5,30.7% CODMn, 31.3% TOC and 47.6% TP. After conducting PCA (principal component analysis) and FA (factor analysis) to analyze water quality characteristics of the tributary rivers, the first factor was classified as CODMn, TOC, EC, TP and BOD5,the second factor as pH, Chl-a and DO, the third factor as water temperature and TN, and the fourth factor as SS and surface flow. In addition, arithmetical sum of each factor’s scores based on grading criteria revealed that Dalseocheon and Namcheon were classified into Group A for their highest scores - 96 and 93, respectively -, and selected as rivers that require water environmental management measures the most. Also, water environmental contamination inspection showed that Palgeocheon had the most number of aquatic factors to be controlled: BOD5, CODMn, SS, TOC, T-P, Chl-a, etc.
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KEYWORD
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Water quality, Geumho River tributaries, Multivariate statistics analysis, Cluster analysis, Grade classification, ArcSWAT, ArcGIS
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