(Received: November 9, 2006; Accepted for publication: December 14, 2006; Published on Web: March 2, 2007)
We researched the water quality of the Donau based on OECD reports. Observations in the reports have defects that make evaluation of environmental situations difficult. By using interpolations in the compensation quantitative structure-activity relationships (CQSAR), we complement the defects in the water quality of the rivers. Thus, we get a complete data set for dissolved oxygen, biochemical oxygen demand, and total phosphorus. Using the data set, we examine re-naturalization of the Donau. We investigate the effect of dams between Slovakia and Hungary, by using reconstructions of neural networks in CQSAR.
The water quality of the Donau has been improved as to DO and BOD. The rivers have been re-naturalized. We believe that the effect is found in these indexes; however, not so much for the T-P.
We find a negative effect of the dam construction on changes of DO in the Hungary Donau.
Keywords: Water quality, Donau, Re-naturalization, Compensation Quantitative Structure-Activity Relationship (CQSAR)
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