Ljiljana Takić

Evaluation of the Ecochemical Status of the Danube in Serbia in Terms of Water Quality Parameters

The Danube is an international river passing partly through Serbia. The protection of the environment and sustainable use of water resources is a primary task that implies constant monitoring of the quality status and evaluation of ecochemical status of the water in the Danube basin. The investigation includes calculation of all-inclusive water quality by the Serbian water quality index (SWQI) method and an evaluation of eco-chemical status of the Danube water in terms of water quality parameters from the entry to the exit point along its course through Serbia in the year of 2009. The results show that the overall quality of the Danube water on the territory of Serbia corresponds to the descriptive indicator of “very good” water. According to the Council Directive75/440/EEC, the evaluation of the ecostatus, with slight deviation of individual parameters at Pančevo, corresponds to A1 category of the surface water quality intended for the abstraction of drinking water supplies in member states.

Application of multivariate statistical techniques in the water quality assessment of Danube river, Serbia

Abstract The aim of this article is to evaluate the quality of the Danube River in its course through Serbia as well as to demonstrate the possibilities for using three statistical methods: Principal Component Analysis (PCA), Factor Analysis (FA) and Cluster Analysis (CA) in the surface water quality management. Given that the Danube is an important trans-boundary river, thorough water quality monitoring by sampling at different distances during shorter and longer periods of time is not only ecological, but also a political issue. Monitoring was carried out at monthly intervals from January to December 2011, at 17 sampling sites. The obtained data set was treated by multivariate techniques in order, firstly, to identify the similarities and differences between sampling periods and locations, secondly, to recognize variables that affect the temporal and spatial water quality changes and thirdly, to present the anthropogenic impact on water quality parameters.

New approach for water quality analysis and modeling

Watercourses present a special case of water reservoirs. Regardless to the method of their investigation, there is still a search for the convenient method for processing of collected measurements of water quality parameters. Research direction was defined by the EU directive framework for aquatic bodies. Taking into consideration the existing methods for water quality analysis, this paper presents a proposal of a new method for analysis and modeling the aquatic body behavior. The measurements conducted at five stations on the river Ibar in the period from 2007 to 2012 are used as a basis. The basic method is based on multivariable analysis of unevenly time spaced measuring data. The basis was the correlation analysis that defined dependent parameters for determination the SWQI indices. Analyses have shown that the obtained results can be used for establishing an integral monitoring the water quality of aquatic system of the river Ibar. Also, they pointed out the possible directions for measurement and analysis upgrading.