Solute/Porous Media Interactions Card Description (e-G)
A number of parameters are specified in the eSTOMP Solute/Porous Media Interaction Card.
Solid-Aqueous Partition Coefficient
Solid-Aqueous partition coefficient defines the interface equilibrium of a solute adsorbed on the solid and dissolved in the aqueous phase, and refers to the concentration of solute adsorbed on the solid phase (per unit mass of solid phase) over the concentration of solute dissolved in the aqueous phase (per unit mass aqueous phase). The longitudinal and transverse hydraulic dispersivities are properties only of the rock/soil type.
Longitudinal Dispersivity
Longitudinal dispersivity is defined with respect to dispersion along the flow path and is assumed to be independent of the flow direction with respect to the porous media structure.
Transverse Dispersivity
Transverse dispersivity is defined with respect to dispersion transverse to the flow path, independent of the flow direction. For stratified porous media, it can be expressed as the horizontal and vertical transverse dispersivities.
Directional Dispersion Coefficients
For stratified media, the directional dispersion coefficient (D) is calculated based on the equations below (Burnett and Frind 1987; Zheng and Wang, 1999):
where V is the directional aqueous velocity and |V| is defined as
The equations reduce to those for isotropic media when horizontal and vertical transverse dispersivities are equal.
References:
Burnett, R. D., and Frind, E. O. (1987), Simulation of contaminant transport in three dimensions: 2. Dimensionality effects, Water Resour. Res., 23( 4), 695– 705, doi:10.1029/WR023i004p00695.
Zheng, Chunmiao and Wang, Pu. (1999). MT3DMS: A Modular Three-Dimensional Multispecies Transport Model for Simulation of Advection, Dispersion, and Chemical Reactions of Contaminants in Groundwater Systems; Documentation and User's Guide.
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