Journal of Environmental Impact Assessment (환경영향평가)

Korean Society of Environmental Impact Assessment (한국환경영향평가학회)
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Assessment of Water Quality in the Miho Stream Using Multivariate Statistics

다변량 통계기법을 이용한 미호천 본류 수질특성 평가

  • Yoon, Hyeyoung (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • Kim, Jeehyun (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • Chae, Minhee (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • Cho, Yoonhae (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • Cheon, Seuk (Geum River Environment Research Center, National Institute of Environmental Research)
  • 윤혜영 (국립환경과학원 금강물환경연구소) ;
  • 김지현 (국립환경과학원 금강물환경연구소) ;
  • 채민희 (국립환경과학원 금강물환경연구소) ;
  • 조윤해 (국립환경과학원 금강물환경연구소) ;
  • 천세억 (국립환경과학원 금강물환경연구소)
  • Received : 2019.03.14
  • Accepted : 2019.07.11
  • Published : 2019.08.31
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Abstract

In The study, is to investigate the spatial characteristics of the Miho stream, which is the main tributary of the Geum River system, and to identify the main factors influencing the water quality using water quality analysis and multivariate analysis. The survey subjects were selected as 7 main sites in the Miho stream water system, From 2012 to 2017, 16 items including weather temperature and weather data were used for multivariate analysis. As a result of the water quality analysis, the average concentration of BOD and COD for 6 years was 3grade (normal) compared with the water quality environmental standard (river) of conditions. The concentrations of nitrogen and phosphorus were highest at th upstream site, then decreased and then increased again by the hydrogeological and geomorphological effect. Cluster analysis of spatial and water quality characteristics, it was evaluated as three clusters and the pollution sources is the greatest impact. As a result of principal component analysis and factor analysis on each cluster and mainstream, three to four major components were extracted. Main stream and the Cluster 1, Cluster 3 first principal factor included nitrogen and seasonal factors,first factor of Cluster 2 included nitrogen and water temperature. Nitrogen is the principal factor which affects water quality in Miho stream.

본 연구는 금강 수계 주요 지류인 미호천수계를 대상으로 수계의 공간적 특성을 조사하고, 수질분석과 통계분석을 이용하여 수질에 영향을 주는 주요인을 파악하였다. 조사 대상은 미호천 수계의 본류에서 수질측정망을 운영 중인 7개 지점으로 선정하였고, 2012년부터 2017년까지 6년간 측정망 수온 등 16개 항목, 기상자료 등을 사용하여 다변량 통계분석을 실시하였다. 수질 분석 결과, 유기물질 지표인 BOD와 COD의 6년간 평균 농도는 환경부 수질 및 수생태계 생활환경기준(하천)과 비교하여 III등급(보통)으로 나타났다. 지점별 비교 결과 질소계열과 인계열의 농도는 상류 지점에서 가장 높게 나타났으며, 이후 감소하는 경향을 보이다 수리적, 지형적 영향으로 다시 증가하는 것으로 나타났다. 공간 및 수질 특성을 고려한 계층적 군집분석 결과, 총 3개의 군집으로 평가되었으며, 수계에 유입되는 오염원의 영향이 큰 것으로 나타났다. 각 군집과 본류 전체를 대상으로 실시한 주성분 및 요인분석 결과, 각각 3~4개의 주성분이 추출되었다. 요인분석 결과 제1요인은 본류와 Cluster1,3에서 질소계열 요인과 계절적 요인, Cluster2에서 질소계열 요인과 수온으로 나타나 미호천 수계의 수질에 가장 큰 영향을 미치는 인자는 질소계열의 농도인 것으로 나타났다.

Keywords

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