한국물환경학회지 (Journal of Korean Society on Water Environment)

  • 제27권4호
  • /
  • Pages.467-474
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  • 2011
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  • 2289-0971(pISSN)
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  • 2289-098X(eISSN)
한국물환경학회 (Korean Society on Water Environment)
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주암호 외남천 유역 하천수의 질소농도와 동위원소비 분석을 이용한 오염원 평가

Estimation of Pollution Sources of Oenam Watershed in Juam Lake using Nitrogen Concentration and Isotope Analysis

  • 최유진 (국립환경과학원 수질총량관리센터) ;
  • 정재운 (국립환경과학원 영산강물환경연구소) ;
  • 최우정 (전남대학교 지역바이오시스템공학과) ;
  • 윤광식 (전남대학교 지역바이오시스템공학과) ;
  • 최동호 (전남대학교 지역바이오시스템공학과) ;
  • 임상선 (전남대학교 지역바이오시스템공학과) ;
  • 정주홍 (전남대학교 지역바이오시스템공학과) ;
  • 임병진 (국립환경과학원 영산강물환경연구소) ;
  • 장남익 (국립환경과학원 기후대기연구부 대기환경연구과)
  • Choi, Yujin (Water Pollution Cap System Division, National Institute of Environment Research) ;
  • Jung, Jaewoon (Yeongsan River Environment Research Laboratory) ;
  • Choi, Woojung (Department of Rural & Bio-systems Engineering, Chonnam National University) ;
  • Yoon, Kwangsik (Department of Rural & Bio-systems Engineering, Chonnam National University) ;
  • Choi, Dongho (Department of Rural & Bio-systems Engineering, Chonnam National University) ;
  • Lim, Sangsun (Department of Rural & Bio-systems Engineering, Chonnam National University) ;
  • Jeong, Juhong (Department of Rural & Bio-systems Engineering, Chonnam National University) ;
  • Lim, Byungjin (Yeongsan River Environment Research Laboratory) ;
  • Chang, Namik (Air Quality Research Division, National Institute of Environment Research)
  • 투고 : 2011.03.30
  • 심사 : 2011.06.11
  • 발행 : 2011.07.30
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초록

In an effort to investigate water pollution characteristics of Juam lake, water samples were collected from three sites (Sites A, B, and C) of Oenam stream which is a typical tributary of rural watershed in the lake and analyzed for N concentration and the corresponding isotope ratio (${\delta}^{15}N$) of ${NO_3}^-$. Concentrations of ${NO_3}^-$ were not dramatically different among the sites; $0.8{\pm}0.2mgNL^{-1}$ (range: $0.0{\sim}4.3mgNL^{-1}$) for Site A, $1.1{\pm}0.2mgNL^{-1}$ ($0.0{\sim}4.3mgNL^{-1}$) for Site B, and $1.1{\pm}0.1mgNL^{-1}$ ($0.1{\sim}2.6mgNL^{-1}$) for Site C. Meanwhile, ${\delta}^{15}N$ tended to decrease with river flow; it was highest for Site A ($45.5{\pm}5.3$‰) followed by Site B ($19.7{\pm}2.0$‰) and Site C ($8.7{\pm}1.5$‰). Such high ${\delta}^{15}N$ values of ${NO_3}^-$ in Site A suggested that ${NO_3}^-$ derived from livestock feedlot (specifically livestock excrete of which ${\delta}^{15}N$ is higher than 10‰) is the predominant pollution sources despite mountainous area occupied the most of land-use in the watershed. Using the two-sources isotope mixing model, it was estimated that the contribution of cropping activities (i.e. fertilization) became greater in down-stream area (Sites B and C) due to the higher agricultural land-use than the up-stream area (Site A). Particularly, during the active cropping season, the low contribution of organic pollution sources indicated that domestic sewage was not the predominant pollution source. Therefore, it was suggested that agricultural sources such as livestock farming and cropping rather than mountainous and residential are the dominant sources of water pollution in the study area. These results could be effectively utilized in elucidating water pollution sources in rural areas and selecting water management practices.

키워드

과제정보

연구 과제 주관 기관 : 영산강물환경연구소

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