Migration of contaminants through the unsaturated zone overlying the Hesbaye chalky aquifer in Belgium: a field investigation

Journal of Contaminant Hydrology
Serge BrouyèreVincent Hallet

Abstract

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 ...Continue Reading

Citations

Jun 27, 2013·Environmental Geochemistry and Health·L WangJ P Bloomfield
Oct 16, 2010·International Journal of Environmental Research and Public Health·Diane Saint-LaurentFrancis Baril
Jul 17, 2012·Journal of Contaminant Hydrology·A MangeretP Crançon
Feb 14, 2012·Journal of Contaminant Hydrology·Jana K Levison, Kent S Novakowski
Sep 25, 2010·Journal of Contaminant Hydrology·Philippe OrbanAlain Dassargues
Apr 3, 2007·Journal of Contaminant Hydrology·Quanlin ZhouGudmundur S Bodvarsson
Jul 5, 2015·Journal of Contaminant Hydrology·Lise CaryJérôme Labille
Mar 27, 2009·Environmental Research·Melanie WickiMarcel Tanner
Nov 1, 2018·The Science of the Total Environment·Ningxin ChenPierre Ribstein

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