Delineation of groundwater protection zones based on tracer tests and transport modeling in alluvial sediments |
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Authors: | J Derouane A Dassargues |
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Institution: | (1) Laboratoires de Géologie de l'Ingénieur, d'Hydrogéologie et de Prospection géophysique (LGIH), University of Liège, Bat. B19 Sart-Tilman, B-4000 Liège, Belgium Fax: +32-4-366-2817, BE |
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Abstract: | Regulations aiming to protect exploitable groundwater resources were edicted in Belgium a few years ago. Therefore, prevention
and protection zones are defined by law and must be determined practically around each pumping well or spring, based on local
hydrogeological conditions. The determination of hydrodynamic and hydrodispersive parameters, characterizing the local flow
and transport properties of the aquifer, requires pumping and tracing tests. The interpretation of these field experiments,
considering the heterogeneity of the geological layers, is performed through the use of numerical FEM simulations of the groundwater
flow and pollutant transport conditions in a deterministic framework. After calibration of the model on experimental measurements,
multiple simulations with contaminant injections at various points of the modeled domain allow the determination of the transfer
time of the pollutant in the studied aquifer whilst taking the updated heterogeneity into account. On the basis of the computed
transfer times in the saturated zone, the various prevention and protection areas can be assessed based on provisions of the
law.
Received: 27 June 1997 · Accepted: 29 July 1997 |
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Keywords: | Groundwater resources Alluvial aquifer Protection zones Tracing test Numerical model |
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