engleski

Assessing the surface water status in Panonian ecoregion by water quality index model

The results of a 3-year monitoring study of surface water status in Panonian ecoregion for three different water types (4, 5B, 5C) are presented and evaluated statistically with descriptive and multivariable analysis. Basic statistical and correlation analysis of the 7 indicators of water quality (pH, dissolved oxygen, biological oxygen demand (BOD), total organic carbon (TOC), nitrate, total nitrogen and total phosphorus), all included in modified water quality index (WQIM) for the Panonian ecoregion, were performed. The analysis showed correlation between individual variables and especially strong correlation of BOD and TOC. Two linear prediction models (multivariable linear regression model (MLR) and piecevise linear regression model (PLR)) of WQI for assesment of water status in Panonian ecoregion were developed. In these linear models of WQI, indicator BOD was replaced with indicator TOC. In predicting WQI for the three different water types in Panonian ecoregion, better results were obtained with a correlation coefficients R2(4)=0, 88, R2(5B)=0, 76 and R2(5C)=0, 79 by piecevise linear regression model.

Water quality ; Water quality index ; Multivariable linear regression model ; Piecevise linear regression model

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