Stochastic delineation of wellhead protection area in fractured aquifers and parametric sensitivity study |
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Authors: | S Chevalier M A Buès J Tournebize O Banton |
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Institution: | (1) Laboratoire Environnement, Géomécanique et Ouvrages – Ecole Nationale Supérieure de Géologie, Rue du Doyen Roubault, B.P. 40, 54501 Vandoeuvre-lès-Nancy Cedex, France, FR;(2) INRS-EAU, Université du Québec, 2800 Rue Einstein, C.P. 7500, Sainte-Foy (Qc) G1V 4C7, Canada, CA |
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Abstract: | In many countries, the setup of protection areas around every drinking water well was instituted at a national level in order
to preserve the quality of water as well as the perennially of the resource. Wellhead protection surfaces have been defined
using capture zones showing the area influenced by a well within a certain time. A stochastic method is developed for delineating
time-related capture zones in fractured aquifers characterised by a low porosity and a high degree of fracturing. The flow
velocity within the fractures is determined statistically depending on the distribution of the fracture features and the mass
transfer solution is obtained through a particle tracking algorithm. Probabilistic capture zone curves are obtained as a function
of the travel time of particles to the well and the percentage of particles apt to be extracted up to this time. A sensitivity
study of fracture network parameters leads to the conclusion that orientations and aperture distribution of the fracture sets
are of primary importance to the wellhead protection delineation. |
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