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EXH 325: VS2DT Solute Transport Variably Saturated Porous Media Table of Contents

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Sea-Tac Airport
Third Runway
PCHB
Box 09

This technical report documents VS2DT, a computer program that models how chemical solutes move through variably saturated porous soil and rock, accounting for processes such as advection, hydrodynamic dispersion, decay, adsorption, and ion exchange. The document includes the underlying mathematical theory, numerical methods, data input instructions, and verification problems comparing the program's results against known analytical solutions. While primarily a groundwater contaminant transport modeling tool, it has no direct connection to airport noise policy.

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Notes

Exhibit 325 (AR 020514–020516) is a table of contents and figures/tables index from the VS2DT computer program documentation, covering simulation of solute transport in variably saturated porous media. Topics include advection, hydrodynamic dispersion, source/sink terms, decay, adsorption, ion exchange, boundary conditions, finite-difference spatial and temporal discretization, mass balance, and program verification. Five verification problems are listed, referencing analytical solutions by Hsieh (1986), van Genuchten (1982), and Huyakorn and others (1985). Isotherms covered include Freundlich, Linear, and Langmuir. Document is filed in the PCHB Third Runway EIS administrative record.

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