[논문]통계분석 및 수질지수를 이용한 남한강 하류 유역의 수질 평가

조용철; 최현미; 류인구; 김상훈; 신동석; 유순주

doi:10.15681/kswe.2021.37.2.114

통계분석 및 수질지수를 이용한 남한강 하류 유역의 수질 평가
Assessment of Water Quality in the Lower Reaches Namhan River by using Statistical Analysis and Water Quality Index (WQI) 원문보기

한국물환경학회지 = Journal of Korean Society on Water Environment, v.37 no.2, 2021년, pp.114 - 127

조용철 (국립환경과학원 한강물환경연구소) , 최현미 (국립환경과학원 한강물환경연구소) , 류인구 (국립환경과학원 한강물환경연구소) , 김상훈 (국립환경과학원 한강물환경연구소) , 신동석 (국립환경과학원 한강물환경연구소) , 유순주 (국립환경과학원 한강물환경연구소)

Abstract ▼ AI-Helper

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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표/그림 (14)

그림 Fig. 1. Location map of water quality monitoring sites in the lower reaches of the Namhan River.
표 Table 1. A list of water quality parameters and accepted ranges to calculate real-time water quality index (RTWQI)
표 Table 2. Classification schemes of RTWQI and CCME WQI
표 Table 3. Basic statistics data of water quality parameters at water quality monitoring sites from January 2017 to December 2019
그림 Fig. 2. Spatial distribution of BOD and T-P at main channels and major tributaries in the lower reaches of the Namhan River according to living environment standard of the river.
그림 Fig. 3. Dendrogram showing hierarchical clustering of monitoring sites according to Ward's method.
그림 Fig. 4. Pearson's correlation coefficient among the water quality parameters.
그림 Fig. 5. The component plot in the rotated space based on PCA.
표 Table 4. Rotated component matrix for water quality parameters based on PCA
그림 Fig. 6. WQI distribution map of the study area.
표 Table 5. Summary statistics of WQI at different monitoring sites during the study period (2017~2019)
그림 Fig. 7. Heat map analysis of monthly WQI for main channels and major tributaries in the lower reaches of the Namhan River.
그림 Fig. 8. The Mann-Kendall trend test for WQI.
표 Table 6. Result of Mann-Kendall trend test for water quality data

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