Pore-Scale Evaluation of Enhanced Mixing within Preferential Transport Zones

Thomas Willingham, Charles Werth, Al Valocchi, Peter Grathwohl & Thomas Willingham
A prerequisite to determining risk from a subsurface contaminant plume is to determine chemical concentrations down gradient from the source zone. For a conservative contaminant, down gradient concentrations depend on the initial source zone concentrations and the extent to which the contaminant mixes (i.e., dilutes) with surrounding groundwater. For a (bio)reactive contaminant, down gradient concentrations also depend on the rate of reaction; this can be governed by the rate that the contaminant mixes with other...
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