MATHEMATICAL MODELING OF THE UNDERGROUND HYDROSPHERE POLLUTION PROCESS
Keywords:
Subsurface hydrosphere, tailings storage facility, Richards equation, Darcy's law, Brooks-Corey model, advective-dispersive transport, hydrodynamic dispersion tensor, linear sorption, COMSOL MultiphysicsAbstract
This article examines a two-dimensional, non-stationary problem involving coupled hydrodynamic and convective-diffusion modeling. The authors investigate the filtration of contaminated solutions from a surface reservoir (tailings impoundment) through an unsaturated, two-layer porous medium to an aquifer. The mathematical description of the hydrodynamics is based on the nonlinear Richards equation, incorporating the Brooks-Corey model to describe relative phase permeability. Contaminant transport is modeled using an advection-dispersion equation that takes into account linear sorption (desorption) by the soil skeleton and two-phase decay kinetics. The problem is solved using the finite element method (FEM) on a mesh of 4106 triangular elements.
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