Reference : Migration of contaminants through the unsaturated zone overlying the Hesbaye chalky aqui...
Scientific journals : Article
Engineering, computing & technology : Geological, petroleum & mining engineering
http://hdl.handle.net/2268/2335
Migration of contaminants through the unsaturated zone overlying the Hesbaye chalky aquifer in Belgium: a field investigation
English
Brouyère, Serge mailto [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Hydrogéologie & Géologie de l'environnement >]
Dassargues, Alain [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Hydrogéologie & Géologie de l'environnement >]
Hallet, Vincent [Université de Liège - ULg > Sciences appliquées > LGIH > >]
Aug-2004
Journal of Contaminant Hydrology
Elsevier Science Bv
72
1-4
135-164
Yes (verified by ORBi)
International
0169-7722
Amsterdam
[en] chalk ; loess ; solute transport ; tracer ; saturated zone ; unsaturated zone ; dual-porosity, dual-permeability
[en] This paper presents the results of a detailed field investigation that was performed for studying groundwater recharge processes and solute downward migration mechanisms prevailing in the unsaturated zone overlying a chalk aquifer in Belgium. Various laboratory measurements were performed on core samples collected during the drilling of boreholes in the experimental site. In the field, experiments consisted of well logging, infiltration tests in the unsaturated zone, pumping tests in the saturated zone and tracer tests in both the saturated and unsaturated zones. Results show that gravitational flows govern groundwater recharge and solute migration mechanisms in the unsaturated zone. In the variably saturated chalk, the migration and retardation of solutes is strongly influenced by recharge conditions. Under intense injection conditions, solutes migrate at high speed along the partially saturated fissures, downward to the saturated zone. At the same time, they are temporarily retarded in the almost immobile water located in the chalk matrix. Under normal recharge conditions, fissures are inactive and solutes migrate slowly through the chalk matrix. Results also show that concentration dynamics in the saturated zone are related to fluctuations of groundwater levels in the aquifer. A conceptual model is proposed to explain the hydrodispersive behaviour of the variably saturated chalk. Finally, the vulnerability of the chalk to contamination issues occurring at the land surface is discussed. (C) 2003 Elsevier B.V. All rights reserved.
Aquapôle - AQUAPOLE
Etude phénoménologique de la propagation d'une susbtance miscible en milieu non saturé et application au transfert des nitrates vers la nappe aquifère de Hesbaye
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/2335
10.1016/j.jconhyd.2003.10.009
Available at ScienceDirect.com

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