Groundwater And Contaminant Travel Time
Distributions Near Permeable Reactive Barriers
Author(s)
H. Klammler, K. Hatfield & I. V. Perminova
Abstract
Permeable Reactive Barriers (PRBs) is a passive in-situ technology, which is
based on the interception and remediation of a contaminant plume through
installation of reactive material in an aquifer. Groundwater and contaminant
travel times for a given location in the aquifer to or from the PRB are important
parameters in PRB design and performance monitoring. The approach taken is
two-dimensional in the horizontal plane and based on existing flow field
solutions for a series of PRB configurations. Transport is considered purely
advective with a possible retardation between groundwater and contamination.
The aquifer is assumed homogeneous and a dimensionless travel time is
introduced for arbitrary magnitudes of ambient groundwater flow, confined
aquifer thickness and porosity as well as contaminant retardation. Travel time is
expressed in a general form by an integral along curved stream lines in the
physical plane and transformed into an integral along a straight stream line in the
complex potential plane, where a simple numerical integration method is applied
to generate maps of isochrones. Travel times are seen to be rather uniformly
distributed within capture/release zones with minor effects of local low flow
zones (stagnation points). Funnel-and-gate systems show a stronger lateral
growth of capture/release zones at early times than other PRB types. Drain-andgate
PRBs possess closed isochrones and are identified as transitional
configurations between classic PRBs and pump-and-treat systems.
Keywords: aquifer, plume, remediation, capture zone, conformal mapping,
particle tracking.
Keywords
aquifer, plume, remediation, capture zone, conformal mapping,
particle tracking
Related Book
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