Journal of Environmental Impact Assessment (환경영향평가)

Korean Society of Environmental Impact Assessment (한국환경영향평가학회)
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Evaluation of Discharge-Water Quality Characteristics and River Grade Classification of Jinwi River Unit Basin

진위천 단위유역의 유량-수질 특성 및 하천 등급화 평가

  • Cho, Yong-Chul (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Choi, Jin-Woo (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Noh, Changwan (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Kwon, Phil-Sang (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Kim, Sang-hun (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Yu, Soonju (Han River Environment Research Center, National Institute of Environmental Research)
  • 조용철 (국립환경과학원 한강물환경연구소) ;
  • 최진우 (국립환경과학원 한강물환경연구소) ;
  • 노창완 (국립환경과학원 한강물환경연구소) ;
  • 권필상 (국립환경과학원 한강물환경연구소) ;
  • 김상훈 (국립환경과학원 한강물환경연구소) ;
  • 유순주 (국립환경과학원 한강물환경연구소)
  • Received : 2018.11.23
  • Accepted : 2018.12.07
  • Published : 2018.12.31
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Abstract

The aim of this study is to examine the characteristics analysis of the discharge and water quality based on TPLMS (Total Pollution Load Management System) in the Jinwi River unit basin, and to propose a management plan by selecting the point that needs improvement of water quality in order to achieve the target water quality. We evaluated the discharge and water quality characteristics, statistical analysis, daily delivery load and daily delivery density, grade classification, for 14 total pollution load site's from 2014 to 2016 year in Jinwi river unit basin. The average discharge of Jinwi river unit basin is $22.411m^3/s$ and discharge of Hwangguji River is 32.8% and the water quality characteristics along the tributary river were clarified spatially. As the result, it was analyzed that Seongeun River is an indirect indicator of organic pollutants, Gwanri River is a seasonal factor, Osan River and Hwangguji River both affect water quality. Estimation of delivered pollutant loads at the HG-3 site was 6,470.4 BOD kg/day, 6,846.7 TN kg/day and delivered pollutant loads density increased to $220.9BOD\;kg/day/km^2$, $22.4TP\;kg/day/km^2$ at the HG-4 site. This result demonstrates that the total pollution load site needed to improve water quality of the Jinwi River unit basin was HG-3 site.

본 연구는 진위천 단위유역의 수질오염총량제도에 따른 유량 및 수질 특성을 정확히 파악하고 목표 수질을 달성하기 위하여 수질 개선이 우선적으로 필요한 총량 지점을 선정하여 관리 방안을 제시하는 것이다. 진위천 단위유역의 2014년부터 2016년까지 14개 총량 지점을 대상으로 유량 및 수질 특성, 통계 분석, 유달부하량 및 유달부하 밀도 산정, 하천 등급화 등을 평가하였다. 진위천 단위유역의 유량은 평균 $22.411m^3/s$이고 황구지천의 유량이 32.8%를 차지하였으며 지류 하천에 따른 공간적으로 수질특성이 뚜렷하게 나타났다. 주성분 분석 결과 오산천과 황구지천은 유기오염 간접지표 및 계절적 요인, 성은천은 유기오염 간접지표 요인, 관리천은 계절적 요인이 수질에 영향을 미치는 것으로 분석되었다. 유달부하량 산정 결과 HG-3 지점에서 6,470.4 BOD kg/day, 6,846.7 TN kg/day로 높게 나타났으며 유달부하 밀도는 HG-4 지점에서 $220.9BOD\;kg/day/km^2$, $22.4TP\;kg/day/km^2$로 높게 나타났다. 하천 등급화 방법을 이용한 진위천 단위유역의 수질 개선이 우선으로 필요한 총량 지점은 HG-3 지점으로 나타났다.

Keywords

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Figure 1. Sampling locations for discharge and water quality monitoring in the Jinwi River unit basin. Jinwi River (JW-1, JW-2, JW-3, JW-A), Seongeun River (SE-1), Osan River (OS-1, OS-2, OS-2), Hwangguji River (H-1, HG-2, HG-3, HG-4, HG-5), Gwanri River (GR-1).

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Figure 2. Process of principal component analysis (PCA).

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Figure 3. Statistical analysis of water quality of monitoring site’s in Jinwi River using the box Plot (a) BOD, (b) COD, (c) SS, (d) TN, (e) TP, (f) TOC.

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Figure 4. Grade classification results according to water quality and discharge.

Table 1. Area of 8 city in the Jinwi River basin

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Table 2. Analysis of water flow measurement result data by year (2014-2016)

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Table 3. Average concentration of water quality data in the monitoring sites (2014-2016)

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Table 4. Comparison of loading values rotated component matrix

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Table 5. Daily delivery load in the tributaries Jinwi River

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Table 6. Daily delivery density in the tributaries Jinwi River

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