Hydrological role of karst in the Chalk aquifer of Upper Normandy, France

Abstract : The role of karst on large-scale groundwater flow is defined for the Chalk aquifer of Upper Normandy (western Paris Basin), France. In the regional context, chalk plateaus occupy the greater part of watersheds and are the main sites of groundwater recharge. Previous studies focused on karstic output systems in the valleys and less on water-level variations in the recharge zones upstream. This study assesses the relevant hydrogeological processes using time-series data (boreholes and springs) recorded along a down-gradient hydrologeological cross-section in two selected watersheds. These hydrological data are interpreted in the framework of previous descriptions of the morphological organization of the study area's karst network. The results highlight the hydrological role of (1) the input karst (vertical conduits) which drains recharging water, (2) the output karst (sub-horizontal conduits widely developed in the vicinity of valleys in the surface watersheds) which drains the output flows, and (3) the connections between these two (input and output) networks, which control the upstream water levels and allow quick transfer to springs, particularly after strong rainfall events. A conceptual model of the hydrological functioning of this covered karst aquifer is established, which should serve for the structuring and parameterization of a numerical model.
Type de document :
Article dans une revue
Hydrogeology Journal, Springer Verlag, 2014, 22 (3), pp.663-677. 〈10.1007/s10040-013-1083-z〉
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https://hal-brgm.archives-ouvertes.fr/hal-01174803
Contributeur : Anne-Marie Pouget <>
Soumis le : jeudi 9 juillet 2015 - 18:17:44
Dernière modification le : lundi 15 janvier 2018 - 11:56:01

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S. El Janyani, J.P. Dupont, N. Massei, S. Slimani, N. Dörfliger. Hydrological role of karst in the Chalk aquifer of Upper Normandy, France. Hydrogeology Journal, Springer Verlag, 2014, 22 (3), pp.663-677. 〈10.1007/s10040-013-1083-z〉. 〈hal-01174803〉

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