Capture Flows Of Funnel-and-gate
Reactive Barriers Without Gravel Packs
Author(s)
H. Klammler, K. Hatfield & A. Kacimov
Abstract
Permeable reactive barriers (PRBs) are a passive in-situ technology, which is
based on the interception and physical, chemical and/or biological remediation of
a contaminant plume through installation of reactive material in an aquifer.
Previous work of the authors includes analytical approaches in two dimensions
(horizontal plane) based on the conformal mapping technique that allows for the
determination of the groundwater flow fields and capture zones of PRBs of
different types. Solutions assume that the permeability kr of the reactive material
itself is high with respect to the surrounding aquifer permeability ka or that
highly permeable gravel packs are present to equilibrate the hydraulic heads at
the up and down-gradient faces of the reactor. Respective results include a
simple relationship Q(R) between capture flow Q and reactor Darcian hydraulic
resistance R. Based on the same technique, the present work gives an exact
solution for funnel-and-gate (FG) and velocity equalization wall (VEW) PRBs
without gravel packs for the particular case of kr = ka. Furthermore, a numerical
finite difference study is performed to show that Q(R) is a good approximation
(with errors in the 1% range of maximum capture flow Q(0)) for FG and VEW
Keywords
PRB, groundwater, aquifer, contaminant plume, passive remediation, conformal mapping, Schwarz-Christoffel
Related Book
Other papers in this volume
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