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The Advective-Transport Observation (ADV2) Package (Anderman and Hill, 2001) allows advective-transport observations of steady-state flow fields to be used in conjunction with the hydraulic head and flow observations included in the three-dimensional ground-water flow parameter-estimation model MODFLOW2000 (Harbaugh and others, 2000; Hill and others, 2000). In the ADV Package, advective-transport paths and times are represented using particle tracking. This allows advective-transport observations to be included in the regression with minimal increase in computational effort. Features of the package include: A particle-tracking routine that duplicates the semi-analytical method of MODPATH (Pollock, 1994). Comparison of the x-, y-, and zmovements of the simulated and observed advective front at defined times. Thus, the direction and path of travel as well as the overall travel distance is included in the calibration process. Calculation of sensitivities of the particle movement to the parameters using the exact sensitivity-equation approach. Composite scaled sensitivities provide users with a quantitative measure of the information provided by the observations. Particle tracking in a forward or backward direction can be used to evaluate transport of contaminants or recharge areas. Inclusion of effects such as retardation by adjustment of the effectiveporosity value.

Improving ground-water flow model calibration with the Advective-Transport Observation (ADV) Package to MODFLOWP