Défense de thèse de doctorat en sciences géologiques
Hydrodynamics of solute transport in karst conduits with contrasted geometries : karstogenesis description and tracer tests modelling in the Waulsortian mudmounds (Furfooz, Belgium)
Date : 06/12/2018 16:00 - 06/12/2018 18:00
Lieu : Amphithéâtre CH01, rue Grafé, 5000 Namur
Orateur(s) : Lorraine DEWAIDE
Organisateur(s) : Vincent HALLET
Jury
Pauline COLLON (ULorraine) co-promotrice, Nathalie DÖRFLIGER (BRGM-Fr), Jean-Marc BAELE (UMons), Malcolm FIELD (EPA-USA), Johan YANS (UNamur) président, Vincent HALLET (UNamur) promoteur
Résumé
The thesis tackles issues related to solute transport in karst conduits. Precisely, the work focuses on the geometrical control of the conduits on artificial tracer transport. The Furfooz karst system was chosen as case study. It is located in the carbonate mudmounds of the Waulsort Formation (Tournaisian-Visean) of Southern Belgium. In this system, the underground river flows through contrasted geometries, i.e. small conduits vs. underground voluminous lakes. The study is based on field information that are mainly gathered by the realization of numerous tracer tests on the karst system. Double-peaked breakthrough curves were sampled downstream the lakes. Hypothesis about the origin of these multi-peaked BTCs are proposed and documented by the tracer tests analysis, and water-level and physico-chemical data. The physical and numerical modelling of the tracer tests are also proposed to dimension the system and verify some postulates. To a smaller extent, the thesis gives a first analysis of complex geochemical processes (dolomitisation/dedolomitisation) and textural variations related to the karstogenesis of the Furfooz massif.
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