The evaluation of risk to the environment by subsurface contamination remains one of the major challenges to the Army. Numerical models such as the U. S. Army's Groundwater Modeling System that simulate water flow and chemical transport are increasingly used in remediation design and analysis. This research contributes toward a better understanding of field-testing methods to obtain model parameters. The focus was on both reactive and sorptive parameters. The experimental ...
Natural soil is a discrete, heterogeneous porous material with many sizes of physical structure. These multi-scale discrete media resist description by differential equations with macroscopic parameters. Constitutive parameters may display an apparent scale dependence or the governing equations may exhibit non-physical behavior. To address these issues, a discrete-medium modeling philosophy is adopted that relies less on complex constitutive theory and more on computational resolution. Specifically, a stochastic, high-resolution, discrete network ...
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