Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Analysis of Water Quality Fluctuations in Upstream Namhan River Watershed Using Long-term Statistical Analysis

통계적 경향 분석을 통한 남한강 상류 수계 수질 변동 해석

  • Byeon, Sang-Don (Department of Environment Sciences, Kangwon National University) ;
  • Noh, Yeon-Jung (Department of Eco Environment Sciences, Kangwon National University) ;
  • Lim, Kyeong-Jae (Department of Regional Infrastructure Engineering, Kangwon National University) ;
  • Kim, Jong-Gun (Department of Regional Infrastructure Engineering, Kangwon National University) ;
  • Kim, Dong-Jin (Wonju Regional Environmental Management Office) ;
  • Hong, Eun-Mi (School of Natural Resources and Environmental Science, Kangwon National University)
  • Received : 2020.06.08
  • Accepted : 2020.08.13
  • Published : 2020.09.30
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Abstract

There are fifteen non-point pollution management areas in Korea and three of them (Doam lake, Daegi district and Golji-cheon) are located in the upstream of the Namhan river watershed. Many efforts to reduce non-point sources (NPS) pollution have been conducted, however, water quality pollution in the watershed is still serious. To solve these problems, it is a priority to grasp water quality using statistical techniques. In this study, a trend analysis was conducted to evaluate the effect of NPS management in the watershed. The long-term trends from 1996 to 2018 of water quality properties were analyzed using data collected from the water environment information system. Seventeen monitoring stations were selected along the main stream in Namhan river basin. Monthly water quality properties (BOD, COD, TN, TP, TN/TP ratio, Conductivity, SS and Chlorophyll-a) were collected and analyzed by Mann-Kendall test and LOWESS. The results showed that the Conductivity tended to increase in all regions and was the highest level in Jijangcheon. Organic pollution such as BOD and COD tended to increase in the Jungseon area. SS did not show a large tendency, but it showed high concentration in the Doam watershed. In all regions, 40% of water quality properties showed a tendency to 'UP', 15% of water quality properties tended to 'DOWN', and 46% indicated no tendency. In order to determine the cause of this, additional research and measures for improvement are necessary. This study will be used for the establishment of water quality policy in the future.

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