Numerical modeling of the flow of polluted groundwater into the Vyatka River

Abstract

In the formation of the hydrochemical regime of water bodies and adjacent territories, a significant role is played by the density stratification effects caused by the heterogeneity of the distribution of mineralization fields. When the concentration of the heavy solute is larger than one ppm under terrestrial conditions, these effects have a great influence on the nature of the flow. Such effects can not be described using hydrodynamic models within the framework of shallow water equations; for their correct description, it is necessary to use hydrodynamic models in a full three-dimensional non-hydrostatic formulation. The present paper presents the results of numerical modeling of the formation of diffuse pollution of the Vyatka River during washing of floodplain water bodies (quarries, lakes) in the region of the Kirovo-Chepetsk industrial complex. The assessment of the scale and intensity of the supply of nitrogen-containing compounds was made. The calculation results form the basis for the development of a number of possible measures aimed at both reducing diffuse runoff and ensuring the standard water quality at the main drinking water intake in Kirov, Russia.