Abstract
Using a Freundlich adsorption isotherm for bromide ( Br− ) published earlier, we used two-dimensional groundwater simulations to compare the dispersion of a conservative tracer to Br− undergoing mildly nonlinear adsorption ( exponent=0.893 ; coefficient=0.0412 ). Variances of the natural logarithm of hydraulic conductivity fields were varied over an order of magnitude to simulate mildly and strongly heterogeneous flow fields. To estimate the apparent accuracies of longitudinal ( AL ) and horizontal transverse ( AT ) dispersivities measured using conservative tracers in field experiments, we considered two operationally defined decisions: the amount of Br− injected (1.0 and 0.1 kg) and the lowest tracer concentration value used in dispersivity computations as a result of analytical quantification limits or background concentrations (0.1 ppm). Results from both operational criteria were compared using hypothesis testing. AL values for the conservative simulations in mild heterogeneity were within a factor o...
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