Neutrally buoyant tracers in hydrogeophysics: Field demonstration in fractured rock

Abstract : Electrical and electromagnetic methods are extensively used to map electrically conductive tracers within hydrogeologic systems. Often, the tracers used consist of dissolved salt in water, leading to a denser mixture than the ambient formation water. Density effects are often ignored and rarely modeled but can dramatically affect transport behavior and introduce dynamics that are unrepresentative of the response obtained with classical tracers (e.g., uranine). We introduce a neutrally buoyant tracer consisting of a mixture of salt, water, and ethanol and monitor its movement during push-pull experiments in a fractured rock aquifer using ground-penetrating radar. Our results indicate a largely reversible transport process and agree with uranine-based push-pull experiments at the site, which is in contrast to results obtained using dense saline tracers. We argue that a shift toward neutrally buoyant tracers in both porous and fractured media would advance hydrogeophysical research and enhance its utility in hydrogeology.
Type de document :
Article dans une revue
Geophysical Research Letters, American Geophysical Union, 2017, 44 (8), pp.3663-3671. 〈10.1002/2017GL073368〉
Liste complète des métadonnées

Littérature citée [33 références]  Voir  Masquer  Télécharger

https://hal-insu.archives-ouvertes.fr/insu-01534692
Contributeur : Isabelle Dubigeon <>
Soumis le : jeudi 8 juin 2017 - 08:21:00
Dernière modification le : lundi 26 mars 2018 - 15:28:03
Document(s) archivé(s) le : samedi 9 septembre 2017 - 12:46:05

Fichier

PL03759.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

Citation

Alexis Shakas, Niklas Linde, Ludovic Baron, John Selker, Marie-Françoise Gerard, et al.. Neutrally buoyant tracers in hydrogeophysics: Field demonstration in fractured rock. Geophysical Research Letters, American Geophysical Union, 2017, 44 (8), pp.3663-3671. 〈10.1002/2017GL073368〉. 〈insu-01534692〉

Partager

Métriques

Consultations de la notice

72

Téléchargements de fichiers

24