Ecology and Resilient Infrastructure

Korean Society of Ecology and Infrastructure Engineering (응용생태공학회)
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Evaluation of Water Quality Characteristics at Kyeongan Stream Using the Flow-Loading Equation and Factor Analysis

유량-오염부하량 관계식과 요인분석을 이용한 경안천의 수질특성 평가

  • Kwon, Phil-Sang (Han River Environment Research Center, National Institute of Environment Research) ;
  • Park, Min-Ji (Han River Environment Research Center, National Institute of Environment Research) ;
  • Lee, Young-Joon (Han River Environment Research Center, National Institute of Environment Research) ;
  • Cho, Yong-Chul (Han River Environment Research Center, National Institute of Environment Research) ;
  • Noh, Chang-Wan (Han River Environment Research Center, National Institute of Environment Research) ;
  • Jung, Woo-Seok (Han River Environment Research Center, National Institute of Environment Research) ;
  • Kim, Ji-Ho (Han River Environment Research Center, National Institute of Environment Research) ;
  • Yu, Soon-Ju (Han River Environment Research Center, National Institute of Environment Research)
  • 권필상 (국립환경과학원 한강물환경연구소) ;
  • 박민지 (국립환경과학원 한강물환경연구소) ;
  • 이영준 (국립환경과학원 한강물환경연구소) ;
  • 조용철 (국립환경과학원 한강물환경연구소) ;
  • 노창완 (국립환경과학원 한강물환경연구소) ;
  • 정우석 (국립환경과학원 한강물환경연구소) ;
  • 김지호 (국립환경과학원 한강물환경연구소) ;
  • 유순주 (국립환경과학원 한강물환경연구소)
  • Received : 2017.11.17
  • Accepted : 2017.12.01
  • Published : 2017.12.31
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Abstract

In this study, we aimed to analyze the characteristics of water quality variation at Kyeongan Stream for a decade and to investigate by the flow-loading equation. The correlation analysis of water quality parameters and the influence factors were examined by statistical analysis. The characteristics of water quality variation showed that the fluctuations in $BOD_5$, $COD_{Mn}$ and TOC were repeated from year to year. TN and TP were decreased by year. By the flow-loading equation, the concentrations of $BOD_5$, $COD_{Mn}$, TOC and TN were decreased when the flow rate was on the rise. However, the flow did not affect the concentration of TP. According to correlation analysis, $BOD_5$ was highly correlated with $COD_{Mn}$ and TOC with the correlation coefficients of 0.890 (p<0.01) and 0.721 (p<0.01). The result of factor analysis, we identified that the water quality in Kyeongan Stream has been highly influenced by the organic matter index, followed by nitrogenous substance depending on the seasonal variations and the influx of suspended solid in accordance with the increase of flow.

본 연구에서는 경안천의 10년 수질변화 특성을 분석하고 유량-오염부하량 관계식을 이용하여 고찰하였다. 통계분석을 이용하여 수질 항목간의 상관분석과 수질에 영향을 미치는 요인분석을 하였다. 수질변화 특성 결과 $BOD_5$, $COD_{Mn}$, TOC는 연도별로 증가와 감소를 반복하는 것으로 나타났고 TN, TP는 연도별로 감소하는 것으로 나타났다. 유량-오염부하량 관계식을 통한 오염물질 유출특성결과 유량 증가 시 $BOD_5$, $COD_{Mn}$, TOC, TN농도는 감소하였으나, TP농도 변화에는 영향을 주지 않는 것으로 나타났다. 상관분석 결과 $BOD_5$는 $COD_{Mn}$, TOC의 상관계수가 0.890 (p<0.01), 0.721 (p<0.01)로 상관성이 통계적으로 높게 나타났다. 요인분석결과 경안천은 유기물 지표항목에 의한 요인이 가장 크며 계절변화에 따른 질소물질에 의한 요인, 유량증가에 따른 부유물질 유입요인 순으로 수질에 영향을 받고 있는 것으로 설명할 수 있다.

Keywords

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