Assessment of groundwater recharge processes through karst vadose zone by cave percolation monitoring

Titre traduit de la contribution: Evaluation des processus de recharge dans la zone vadose des aquifères karstiques par le monitoring de percolation en grottes

Amael Poulain, Arnaud Watlet, Olivier Kaufmann, Michel Van Camp, Hervé Jourde, Naomi Mazzilli, Gaëtan Rochez, Romain Deleu, Yves Quinif, Vincent Hallet (Promoteur)

Résultats de recherche: Contribution à un journal/une revueArticle

72 Téléchargements (Pure)

Résumé

Recharge processes of karst aquifers are difficult to assess given their strong heterogeneity and the poorly known effect of vadose zone on infiltration. However, recharge assessment is crucial for the evaluation of groundwater resources. Moreover, the vulnerability of karst aquifers depends on vadose zone behaviour because it is the place where most contamination takes place. In this work, an in situ experimental approach was performed to identify and quantify flow and storage processes occurring in karst vadose zone. Cave percolation monitoring and dye tracing were used to investigate unsaturated zone hydrological processes. Two flow components (diffuse and quick) were identified and, respectively, account for 66% and 34% of the recharge. Quickflow was found to be the result of bypass phenomenon in vadose zone related to water saturation. We identify the role of epikarst as a shunting area, most of the storage in the vadose zone occurring via the diffuse flow component in low permeability zones. Relationship between rainfall intensity and transit velocity was demonstrated, with 5 times higher velocities for the quick recharge mode than the diffuse mode. Modelling approach with KarstMod software allowed to simulate the hybrid recharge through vadose zone and shows promising chances to properly assess the recharge processes in karst aquifer based on simple physical models.

Titre traduit de la contributionEvaluation des processus de recharge dans la zone vadose des aquifères karstiques par le monitoring de percolation en grottes
langue originaleAnglais
Pages (de - à)2069-2083
Nombre de pages15
journalHydrological Processes
Volume32
Numéro de publication13
Date de mise en ligne précoce9 mai 2018
Les DOIs
Etat de la publicationPublié - 30 juin 2018

mots-clés

  • karst
  • zone vadose
  • essai de traçage
  • fluorimètre
  • uranine

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  • Thèses de l'étudiant

    Flow and transport characterization in vadose and phreatic zones of karst aquifers: Experimental approaches in the Givetian limestones of South Belgium

    Author: Poulain, A., 6 sept. 2017

    Superviseur: Hallet, V. (Promoteur), Yans, J. (Président), Goderniaux, P. (Personne externe) (Jury), Jourde, H. (Personne externe) (Jury), Kaufmann, O. (Personne externe) (Jury) & Vanclooster, M. (Personne externe) (Jury)

    Thèse de l'étudiant: Doc typesDocteur en Sciences

    Contient cette citation

    Poulain, A., Watlet, A., Kaufmann, O., Van Camp, M., Jourde, H., Mazzilli, N., Rochez, G., Deleu, R., Quinif, Y., & Hallet, V. (2018). Assessment of groundwater recharge processes through karst vadose zone by cave percolation monitoring. Hydrological Processes, 32(13), 2069-2083. https://doi.org/10.1002/hyp.13138