THE SPREAD OF POLLUTION IN RIVERS UNDER NATURAL AERATION
2022
Shabalin V. V. (Saint Petersburg State University of Architecture and Civil Engineering)
Russian. The research is motivated by the high level of water pollution in the river Okhta and Slavyanka in the Leningrad Oblast. To solve the problem, a simple mathematical model of river pollution is presented, and the effect of natural aeration on pollutant decomposition is examined. The model consists of a pair of coupled diffusion and convection equations for concentrations of pollutant and dissolved oxygen. The linking of these equations is determined by the reaction between oxygen and pollutant, with the formation of harmless compounds. Numerical and analytical evaluation of pollutant transportation in river water along its length (in one spatial dimension) has been performed. The work examines different variants of pollutant distribution models in the aquatic environment with a given set of parameters for a particular river. These parameters correspond to real situations of river pollution and can contribute to making adequate decisions in planning the restrictions imposed on the sources of industrial and domestic pollution in rural and urban areas.
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