Assessment of Water Quality Target Attainment and Influencing Factors Using the Multivariate Log-Linear Model in the Nakdong River Basin, Republic of Korea

Because identifying the factors affecting water quality is challenging, assessment of an individual component based on arithmetic mean method cannot adequately support management policies. Therefore, in this study, we assessed target attainment at 24 sites Nakdong River Basin by applying multivariate log-linear models to identify influencing quality, including flow and season. The temporal seasonal trend were also analyzed using calculated model coefficients. Specifically, weekly data biological oxygen demand (BOD), total phosphorous (TP), during 2013–2018 used investigate 2018 level for river. significance suitability F-test, root squared error (RMSE), absolute percent (MAPE), adjusted R2 values. All applied study showed statistical prediction BOD TP concentrations. Moreover, was identified as main factor had a predominant effect concentrations tributaries stream, respectively. Furthermore, among sites, targets evidently attained 18 17