Abstract
The paper deals with the issues related to the pollution of aquatic ecosystems. The influence of turbulence on the transport and dispersion of pollutants in the mentioned systems, as well as the calculation of the turbulent diffusion coefficients are studied. A case study on the determination of turbulent diffusion coefficients for some sectors of the Prut River is presented. A new method is proposed for the determination of the turbulent diffusion coefficients in the pollutant transport equation for specific sectors of a river, according to the associated number of P�clet, calculated for each specific area: the left bank, the right bank and the middle of the river.
Highlights
The paper deals with the issues related to the pollution of aquatic ecosystems
It has been found that turbulence influence on this phenomenon is taken into account by turbulent diffusion coefficients
Numerical models for 4 sectors of the Prut River were determined in order to determine the evolution of the pollutant concentration field
Summary
GALINA MARUSIC1*, VALERIU PANAITESCU2 1 Technical University of Moldova, 168 Stefan cel Mare si Sfant Blvd., MD-2004, Chisinau, Republic of Moldova 2 University Politehnica of Bucharest, 313 Splaiul Independentei, 060042, Bucharest, Romania. A new method is proposed for the determination of the turbulent diffusion coefficients in the pollutant transport equation for specific sectors of a river, according to the associated number of Péclet, calculated for each specific area: the left bank, the right bank and the middle of the river. Calculation network for the Prut River, the Criva sector where c is coefficients pollutant concentration (mg/L); of turbulent diffusion in the x and y dDixreacntdionDsy-;. It has been found that the variant using the Peclet number is better because it allows the variation of the local turbulent diffusion properties according to the variable speed field, as compared to the use of empirical formulas that have been developed based on samples taken from several rivers with different water flow parameters. Following the above-mentioned process and performing numerous numerical TDhye. comparison of simulations, the coefficients Dx and the obtained results concerning the concentration of the petroleum products showed a good correlation between the calculated data and the measured values in the field (Table 2)
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