Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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A Study on the Water Quality Changes of TMDL Unit Watershed in Guem River Basin Using a Nonparametric Trend Analysis

비모수 경향분석법 적용을 통한 금강수계 총량관리 단위유역의 수질변화 연구

  • Kim, Eunjung (Watershed and Total Load Management Research Division, National Institute of Environmental Research) ;
  • Kim, Yongseok (Watershed and Total Load Management Research Division, National Institute of Environmental Research) ;
  • Rhew, Doughee (Watershed and Total Load Management Research Division, National Institute of Environmental Research) ;
  • Ryu, Jichul (Watershed and Total Load Management Research Division, National Institute of Environmental Research) ;
  • Park, Baekyung (Watershed and Total Load Management Research Division, National Institute of Environmental Research)
  • 김은정 (국립환경과학원 유역총량연구과) ;
  • 김용석 (국립환경과학원 유역총량연구과) ;
  • 류덕희 (국립환경과학원 유역총량연구과) ;
  • 류지철 (국립환경과학원 유역총량연구과) ;
  • 박배경 (국립환경과학원 유역총량연구과)
  • Received : 2014.01.15
  • Accepted : 2014.02.14
  • Published : 2014.03.30
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Abstract

In order to assess the effect of TMDLs management and improve that in the future, it is necessary to analyze long-term changes in water quality during management period. Therefore, long term trend analysis of BOD was performed on thirty monitoring stations in Geum River TMDL unit watersheds. Nonparametric trend analysis method was used for analysis as the water quality data are generally not in normal distribution. The monthly median values of BOD during 2004~2010 were analyzed by Seasonal Mann-Kendall test and LOWESS(LOcally WEighted Scatter plot Smoother). And the effect of Total Maximum Daily Loads(TMDLs) management on water quality changes at each unit watershed was analyzed with the result of trend analysis. The Seasonal Mann-Kendall test results showed that BOD concentrations had the downward trend at 10 unit watersheds, upward trend at 4 unit watersheds and no significant trend at 16 unit watersheds. And the LOWESS analysis showed that BOD concentration began to decrease after mid-2009 at almost all of unit watersheds having no trend in implementation plan watershed. It was estimated that TMDLs improved water quality in Geum River water system and the improvement of water quality was made mainly in implementation plan unit watershed and tributaries.

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References

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