Abstract
This study analyzed the effects of Yeoju, Gangcheon, Yeoju 1, Neungseo, and Daesin in the Namhan River basin on eutrophication (chlorophyll-a trophic state index: TSI) from September 2012 to December 2018 by path analysis. Depend on the standardized path coefficient, the Yeoju area had a positive (+) effect at 0.792±0.024 (p<0.001) on the Gangcheon. Likewise, Gangcheon’s TSI had an effect on the downstream TSI of Yeoju 1 by the standardization path coefficient of 0.848±0.018 (p<0.001). The standardization path coefficients of Yeoju 1→Neungseo, Neungseo→Daesin were 0.754±0.025 (p<0.001) and 0.817±0.020 (p<0.001), respectively. The livestock solids waste in Gangcheon had a statistically significant positive (+) effect with a standardization path coefficient of 0.169±0.084 (p=0.04). The R-square, the influence of the causal variable on the outcome variable, was very high with 0.641 in Gangcheon, 0.733 in Yeoju, 0.566 in Neungseo, and 0.682 Daesin. According to this study, it was found that controlling the cause of eutrophication in the upstream region is very important in controlling eutrophication of the entire river. This study was conducted on 5 of the Namhan River water quality measurement points. It is thought that continuous causality research will be possible in more regions in the future.
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