Diffusion Models of Environmental Transport

Choy, Bruce; Reible, Danny D.

• Environmental Transport Modeling Introduction Outline Preliminaries Equilibrium Between Environmental Tables Diffusion and the Diffusion Coefficient Surface Mass Transfer Coefficient Mass Balance and Transport Equations Diffusion in a Semi-Infinite Soil/Sediment System Introduction Analysis Summary Numerical Evaluation Development Diffusion in a Finite Layer Soil/Sediment Bed Introduction Analysis Summary Numerical Evaluation Development Diffusion in a Two-Layer Composite Soil/Sediment Bed Introduction Analysis Summary Numerical Evaluation Development Diffusion in a Three-Layer Composite Soil/Sediment Bed Introduction Analysis Summary Numerical Evaluation Development Advection-Diffusion Models Introduction Analysis Summary Numerical Evaluation Development Volatile Liquid Evaporation and Diffusion Through a Soil/Sediment Bed Introduction Analysis Summary Numerical Evaluation Development Diffusion in Systems with Time Dependent Soil-Air Partition Coefficients Introduction Mathematical Analysis Analysis Summary Variable Transformation on a Variety of Time Dependent Air-Soil Partition Coefficient Functions Development Miscellaneous Transport Models Constant Flux, Volatile Liquid Evaporation with Uniform Initial Liquid Saturation Appendices Error Function Laplace Transformation Roots of Transcendental Equations Predicting the Diffusion Coefficient in Vapor Predicting the Diffusion Coefficient in Liquid Sample Calculations of Models Using Mathcad (TM) 7