Computational Modelling Of Reactive Transport
In Hydrogeological Systems
Author(s)
N. J. Kiani, M. K. Patel & C.-H. Lai
Abstract
This study presents numerical simulations of solute transport through
homogeneous and layered heterogeneous porous media taking the effects of
solute partitioning and particle deposition processes into account. The model is
based around PHYSICA’s multi-physics simulation environment and utilizes
finite volume discretisation techniques to investigate the attenuation of reactive
contaminants subject to equilibrium and kinetic adsorption isotherms. A number
of test cases have been conducted for simulating one and two-dimensional
advective-dispersive transport in homogeneous and layered soils. The accuracy
of the model has been examined by means of analytical/numerical solution
comparisons available in the literature. The model predicts that the shape and
spread of contaminant plume can be strongly influenced by the governing
adsorption mechanism for solute migration. Breakthrough curves of solute
transport subject to nonlinear adsorption (advection-dominant problems) exhibit
concentration shocks and sharp fronts with a retarded plume velocity as opposed
to the linear adsorption.
The contaminant concentration in layered physical and geochemically
heterogeneous systems is observed to be affected by contrasting
physical/geochemical properties and velocity variations across the layers.
Keywords: adsorption, finite volume, layered soils, nonlinear isotherm, colloid
transport, geochemically heterogeneous.
1 Introduction
Adsorption is one of the mass transfer processes that control the attenuation of
organic/inorganic compounds in hydrogeological systems. It involves the
Keywords
adsorption, finite volume, layered soils, nonlinear isotherm, colloid
transport, geochemically heterogeneous.
Related Book
Other papers in this volume
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