Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Hydrochemical Characteristics and Changes by Rainfall in the Jungrang River

강우에 의한 중랑천의 수질 특성 변화 연구

  • Kim, Youn-Tae (Department of Earth System Science, Yonsei University) ;
  • Kim, Yu Lee (Department of Earth System Science, Yonsei University) ;
  • Woo, Nam-Chil (Department of Earth System Science, Yonsei University) ;
  • Hyun, Seung Gyu (Department of Earth System Science, Yonsei University)
  • 김연태 (연세대학교 지구시스템과학과) ;
  • 김유리 (연세대학교 지구시스템과학과) ;
  • 우남칠 (연세대학교 지구시스템과학과) ;
  • 현승규 (연세대학교 지구시스템과학과)
  • Received : 2006.04.06
  • Accepted : 2006.05.12
  • Published : 2006.07.30
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Abstract

Effects of a rainfall event (July 28, 2005) on the hydrochemical characteristics of the Jungrang river, the biggest tributary of the Han river, was investigated. Significant spatial variations in the hydrochemical characteristics were observed. At JR2 location, concentrations of T-N and T-P were relatively low indicating occurrence of active oxidation in the stepped drop structure. At JR3 location, concentrations of Na, K, Cl, $NH_4-N$ and EC were elevated suggesting increased discharge from the nearby waste-water treatment plant and tributaries. The rain event diluted major dissolved ion concentrations in the river by 12~52%. The $NO_3-N$ levels were preserved during the rain then increased about twofold after rainfall, suggesting increased discharge of nitrate-contaminated groundwater. Heavy metals including Cd, Co, Cr, Cu and Pb were not detected in all water samples and the leachates from surface sediment samples. Concentrations of Fe, Mn, Al and Zn were below the Korean Drinking Water Guideline. Results of this study suggested that establishment of water-quality monitoring protocols describing temporal and spatial variations in parameters sensitive to rainfall events, relatively steady factors, and contaminant sources is required.

Keywords

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