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Open AccessArticle

Relationship between Coliform Bacteria and Water Quality Factors at Weir Stations in the Nakdong River, South Korea

1
Nakdong River Environment Research Center, 24, 1gil, Pyeong-ri, Dasan-myeon, Goryeong-gun, Gyeongsangbuk-do 40103, Korea
2
National Institute of Environmental Research, 2-1 Gyeongseo-dong, Seo-gu, Incheon 22689, Korea
*
Author to whom correspondence should be addressed.
Water 2019, 11(6), 1171; https://doi.org/10.3390/w11061171
Received: 8 April 2019 / Revised: 2 June 2019 / Accepted: 3 June 2019 / Published: 4 June 2019
(This article belongs to the Section Aquatic Systems—Quality and Contamination)
Artificial structures installed in rivers can change the natural physical, physiochemical, and biological characteristics of the rivers. Coliform bacteria are important water quality indicators, related to human health. This study investigated the relationship between coliform bacteria and water quality factors at eight weir stations constructed in the Nakdong River, a major river in South Korea. Fifteen water quality factors were analyzed at these sites from 2012 to 2016 using correlation and multiple regression analyses. The results for all stations confirmed the analytical validity, with high adjusted R2 values of approximately 0.6 and 0.8 on average for total and fecal coliforms, respectively. The results showed influential water quality factors affecting the concentration of coliform bacteria at weir stations. Specifically, total coliforms were mostly affected by organic matter and fecal coliforms were mostly affected by phosphate phosphorus and suspended solids. Rainfall was the most influential factor affecting both coliforms. Further, both coliforms were negatively affected by organic matter below the Dalseong weir in the mid- to downstream area of the Nakdong River. A positive relationship with phosphate phosphorus was indicated at all weir stations. To the authors’ knowledge, this kind of study has never been attempted so far. Thus, the study results can provide important information on influential water quality factors related to coliform bacteria, especially in the Nakdong River, creating a foundation for future water quality management. View Full-Text
Keywords: Nakdong River; weirs; Coliform bacteria; correlation analysis; multiple regression analysis Nakdong River; weirs; Coliform bacteria; correlation analysis; multiple regression analysis
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Seo, M.; Lee, H.; Kim, Y. Relationship between Coliform Bacteria and Water Quality Factors at Weir Stations in the Nakdong River, South Korea. Water 2019, 11, 1171.

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