Article (Scientific journals)
Finite elements modelling of a large water table aquifer in transient conditions
Dassargues, Alain; Radu, Jean-Pol; Charlier, Robert
1988In Advances in Water Resources, 11 (2), p. 58-66
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Keywords :
Groundwater modelling; Finite elements; water table aquifer; transient conditions; chalk aquifer
Abstract :
[en] A chalky aquifer located near Liege (Belgium), is recharged by infiltration through the overlying loess. Wells and collecting tunnels produce a daily flow of 60OO0m a out of this aquifer when hydrogeological balances have shown that an average yield of 100 0OO m a/day should be possible. Finite element modelling has been developed to foresee the evolution of the water table to get some additional information especially about the main drainage axis. The transient flow constitutive laws are recalled in confined and unconfined aquifers. A new law is proposed to model the water table surface in transient conditions and with a fixed meshing network. Using the local flow equilibrium and the virtual power principle, the FEM formulation is set up. The time integration and the iteration technique are shortly discussed. The 3D discretization and the modelling of the entire aquifer has been realized. The problem requires about 3600 DOF and 2670 8-nodes isoparametric brick finite elements. The modelling has been quite delicate because of the geometric complexity of the different geological layers. This complexity justifies fully the use of the finite element method; there is indeed a great diversity of geological characteristics and the range of the different permeabilities is very wide. Sensitivity of the model to permeabilities and storage coefficient variations has been studied and various numerical problems have been notified. The calibration procedure is described in its main steps, and the most significant results are presented.
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Dassargues, Alain  ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Hydrogéologie & Géologie de l'environnement
Radu, Jean-Pol ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géomécanique et géologie de l'ingénieur
Charlier, Robert ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géomécanique et géologie de l'ingénieur
Language :
English
Title :
Finite elements modelling of a large water table aquifer in transient conditions
Publication date :
1988
Journal title :
Advances in Water Resources
ISSN :
0309-1708
Publisher :
Elsevier Science
Volume :
11
Issue :
2
Pages :
58-66
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 02 December 2008

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