Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Characteristics of Spatial and Temporal Organic Matter in the Han River Watershed

한강수계 유기물의 시·공간적 분포 특성 비교

  • Yu, Soonju (Han-River Environment Research Center, National Institute of Environmental Research) ;
  • Cho, Hangsoo (Han-River Environment Research Center, National Institute of Environmental Research) ;
  • Ryu, Ingu (Han-River Environment Research Center, National Institute of Environmental Research) ;
  • Son, Juyeon (Han-River Environment Research Center, National Institute of Environmental Research) ;
  • Park, Minji (Han-River Environment Research Center, National Institute of Environmental Research) ;
  • Lee, Bomi (Han-River Environment Research Center, National Institute of Environmental Research)
  • 유순주 (국립환경과학원 한강물환경연구소) ;
  • 조항수 (국립환경과학원 한강물환경연구소) ;
  • 류인구 (국립환경과학원 한강물환경연구소) ;
  • 손주연 (국립환경과학원 한강물환경연구소) ;
  • 박민지 (국립환경과학원 한강물환경연구소) ;
  • 이보미 (국립환경과학원 한강물환경연구소)
  • Received : 2018.04.02
  • Accepted : 2018.07.20
  • Published : 2018.07.30
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Abstract

The purpose of this study is to find the characteristics of organic matters based on the distribution and oxidation rates, as noted according to the spatial and temporal variations from 2008 to 2016. Generally speaking, the Han River system is separated into one lower course and two upper courses which are the Namhan River and Bukhan River. The seasonal factor is one of the most important causes of water quality changing in both of the upper courses as a result of a few pollution sources. The concentration of organic matter was measured as higher in the lower course into which great streams with point and non-point sources were identified. According to seasonal variations, however, the change of the organic matter in the lower course is comparatively slighter than that of organic matters in the upper courses. The oxidation rates related to the BOD were 15 %, 17 % and 26 % in the Bukhan River, Namhan River and the lower course, respectively. These results could be explained that more biodegradable organic matter were seen to have existed in the lower courses comparing to the activity in the upper course. The oxidation rates of the BOD were noted as relatively higher in the eutrophicated places with phytoplankton. Therefore the BOD is one of the good index models to find the characteristic of the eutrophicated water. On the other hand BOD would not be enough to estimate concentration of refractory organic matters in the Bukhan and Namhan river. Consequently, both of the TOC and BOD are necessary indices to understand the identified refractory and/or biodegradable characteristics of organic matter.

Keywords

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