Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Long-Term Trend Analyses of Water Qualities in Mangyung Watershed

비모수 통계기법을 이용한 만경강 유역의 장기간 수질 경향 분석

  • Lee, Hye Won (Department of Environmental Science and Engineering, College of Engineering, Ewha Womans University) ;
  • Park, Seoksoon (Department of Environmental Science and Engineering, College of Engineering, Ewha Womans University)
  • 이혜원 (이화여자대학교 공과대학 환경공학과) ;
  • 박석순 (이화여자대학교 공과대학 환경공학과)
  • Received : 2008.05.03
  • Accepted : 2008.07.08
  • Published : 2008.07.30
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Abstract

Spatial and temporal analyses of water qualities were performed for 11 monitoring stations located in Mangyung watershed in order to analyze the trends of monthly water quality data of Biochemical Oxygen Demand (BOD), Total Nitrogen (TN) and Total Phosphorus (TP) measured from 1995 to 2004. The long-term trends were analyzed utilizing Seasonal Mann-Kendall test, LOWESS and three-dimensional graphs were constructed with respect to distance and time. The graph can visualize spatial and temporal trend of the long-term water quality in a large river system. The results of trend analysis indicated that water quality of BOD and TN showed the downward trend. This quantitive and quantitative analysis is the useful tool to analyze and display the long-term trend of water quality in a large river system.

Keywords

Acknowledgement

Supported by : 학술진흥재단

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