Non-Fickian Tracer Dispersion In A Karst Conduit
Embedded In A Porous Medium
Author(s)
A.P. Belov & T.C. Atkinson
Abstract
Non-Fickian tracer dispersion in a karst conduit
embedded in a porous medium
A.P. Belov*, T.C. Atkinson*
"Department of Mathematics and Computing, University of
Glamorgan, Pontypridd, Mid Glamorgan, CF3 7 1DL, UK
^School of Environmental Sciences, University of East Anglia,
77%
ABSTRACT
Longitudinal dispersion of a tracer slug by the flow along a karst conduit is
often assumed to obey Pick's Law, governed by a single dispersion coeffi-
cient. Tracer breakthrough curves have often been interpreted on this basis
despite empirical evidence of non-Fickian asymmetry and tailing of the tra-
cer cloud. A possible cause of this tailing is that tracer diffuses through the
wall of the conduit into slow-moving groundwater in the fractured or
porous aquifer in which the conduit is embedded. The effects of such
behaviour on the time-concentration curve at the end of the conduit are
investigated in this study by means of mathematical analysis. An explicit
analytical solutio
Keywords
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