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Assessment of Water Quality in the Lower Reaches Namhan River by using Statistical Analysis and Water Quality Index (WQI)

통계분석 및 수질지수를 이용한 남한강 하류 유역의 수질 평가

  • Cho, Yong-Chul (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Choi, Hyeon-Mi (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Ryu, In-Gu (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Kim, Sang-hun (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Shin, Dongseok (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) ;
  • 최현미 (국립환경과학원 한강물환경연구소) ;
  • 류인구 (국립환경과학원 한강물환경연구소) ;
  • 김상훈 (국립환경과학원 한강물환경연구소) ;
  • 신동석 (국립환경과학원 한강물환경연구소) ;
  • 유순주 (국립환경과학원 한강물환경연구소)
  • Received : 2020.11.16
  • Accepted : 2021.03.24
  • Published : 2021.03.30

Abstract

Water pollution in the lower reaches of the Namhan River is getting worse due to drought and a decrease in water quantity due to climatic changes and hence is affecting the water quality of Paldang Lake. Accordingly, we have used a water quality index (WQI) and statistical analysis in this study to identify the characteristics of the water quality in the lower reaches of the Namhan River, the main causes of water pollution, and tributaries that need priority management. Typically, 10 items (WT, pH, EC, DO, BOD, COD, SS, T-N, T-P, and TOC) were used as the water quality factors for the statistical analysis, and the matrix of data was set as 324 × 10·1. The correlation analysis demonstrated a strong correlation between Chemical Oxygen Demand (COD) and T-P with a high statistical significance (r=0.700, p<0.01). Furthermore, the result of principal component analysis (PCA) revealed that the main factors affecting the change in water quality were T-P and organic substances introduced into the water by rainfall. Based on the Mann-Kendall test, a statistically significant increase in pH was observed in SH-1, DL, SH-2, CM, and BH, along with an increase in WQI in SH-2 and SM. BH was identified as a tributary that needs priority management in the lower reaches of the Namhan River, with a "Somewhat poor" (IV) grade in T-P, "Fair" grade in WQI, and "Marginal" grade in summer.

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