Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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A Nonparametric Trend Tests Using TMDL Data in the Nakdong River

낙동강 수계의 수질오염총량 자료를 이용한 비모수적 수질추세 분석

  • Kim, Mi-Ah (Water Environment Research Department, National Institute of Environmental Research) ;
  • Lee, Soyoung (Water Environment Research Department, National Institute of Environmental Research) ;
  • Mun, Hyunsaing (Water Environment Research Department, National Institute of Environmental Research) ;
  • Cho, Hang-Soo (Han River Environment Research Center) ;
  • Lee, Jae-kwan (Water Environment Research Department, National Institute of Environmental Research) ;
  • Kim, Kyunghyun (Water Environment Research Department, National Institute of Environmental Research)
  • 김미아 (국립환경과학원 물환경연구부) ;
  • 이소영 (국립환경과학원 물환경연구부) ;
  • 문현생 (국립환경과학원 물환경연구부) ;
  • 조항수 (한강물환경연구소) ;
  • 이재관 (국립환경과학원 물환경연구부) ;
  • 김경현 (국립환경과학원 물환경연구부)
  • Received : 2016.11.03
  • Accepted : 2017.01.11
  • Published : 2017.01.30
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Abstract

We were interested in the long-term temporal and spatial variability trends of water quality. Trend tests such as the Seasonal and Regional Kendall tests and LOWESS (LOcally WEighted Scatter plot Smoother) have been recommended as outstanding tools for trend detection. In this study, we conducted four types of nonparametric trend tests (Seasonal and Regional Kendall tests, LOWESS, and flow-adjusted Seasonal Kendall). We aimed to identify water quality trends using the monthly data for five variables (BOD, COD, TN, TP, and flow) collected from 24 sites in the Nakdong River from August 2004 to December 2013. According to the Regional Kendall test, BOD, COD, and TN increased but TP decreased trend. The Seasonal Kendall test showed that BOD, TN, and TP remained constant at 62.5-83.3% of the sites. COD remained constant at 58.3% of the sites. LOWESS showed that TP gradually increased between 2007 and 2008, then decreased slowly at the Gumi, Geumhogang6, Daeam-1 and Milyanggang3 sites. BOD increased slightly between 2008 and 2009, and then decreased slowly at the Namgang4-1 site. Lastly, a flow-adjusted Seasonal Kendall test was conducted. There were different results between Seasonal Kendall and flow-adjusted Seasonal Kendall tests at 11 of the 24 sites. According to the results from six of the eleven sites, BOD increased at one site, showed no trends at three sited, and decreased at two sites. Each of COD, TN increased at two, one site. but TP decreased at two sites.

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References

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