
RECENT RESEARCH ACCOMPLISHMENTS 3. Do available numerical methods and programs solve the forward problem well enough to support the sensitivity analysis, nonlinear regression, and uncertainty analysis methods of my own work and others? How can these deficiencies be remedied? The sensitivity analysis and regression methods described in Recent Research Accomplishments item 1 requires constitutive equations and numerical methods that represent subsurface flow and transport accurately; any model error diminishes the certainty of the results. Laboratory experiments provide a unique opportunity to test numerical models of subsurface transport, as reported by Mehl and Hill (1999, 2000, 2001). The figure below uses results from a laboratory experiment to evaluate the existence and importance of numerical inaccuracies in the solution methods available in the groundwater transport code MT3DMS.
mchill@usgs.gov Last Modified: April 14, 2008 