Comparaison de la distribution statistique de l'âge des eaux estimée avec des traceurs environnementaux, en utilisant des modèles numériques de mélange binaire et le modèle numérique d'un karst fracturé et plissé

Vallée de Shenandoah, Virginie, et Ouest Virginie, USA

Translated title of the contribution: Comparison of age distributions estimated from environmental tracers by using binary-dilution and numerical models of fractured and folded karst: Shenandoah Valley of Virginia and West Virginia, USA

Richard M. Yager, L. Niel Plummer, Leon J. Kauffman, Daniel H. Doctor, David L. Nelms, Peter Schlosser

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Measured concentrations of environmental tracers in spring discharge from a karst aquifer in the Shenandoah Valley, USA, were used to refine a numerical groundwater flow model. The karst aquifer is folded and faulted carbonate bedrock dominated by diffuse flow along fractures. The numerical model represented bedrock structure and discrete features (fault zones and springs). Concentrations of 3H, 3He, 4He, and CFC-113 in spring discharge were interpreted as binary dilutions of young (0-8 years) water and old (tracer-free) water. Simulated mixtures of groundwater are derived from young water flowing along shallow paths, with the addition of old water flowing along deeper paths through the model domain that discharge to springs along fault zones. The simulated median age of young water discharged from springs (5.7 years) is slightly older than the median age estimated from 3H/3He data (4.4 years). The numerical model predicted a fraction of old water in spring discharge (0.07) that was half that determined by the binary-dilution model using the 3H/3He apparent age and 3H and CFC-113 data (0.14). This difference suggests that faults and lineaments are more numerous or extensive than those mapped and included in the numerical model.

Original languageFrench
Pages (from-to)1193-1217
Number of pages25
JournalHydrogeology Journal
Volume21
Issue number6
DOIs
StatePublished - Sep 1 2013
Externally publishedYes

Fingerprint

age structure
karst
dilution
tracer
valley
CFC
fault zone
bedrock
aquifer
water
lineament
groundwater flow
carbonate
groundwater
comparison
young
flowing water

Keywords

  • Fractured rocks
  • Groundwater age
  • Karst
  • Numerical modelling
  • USA

ASJC Scopus subject areas

  • Water Science and Technology
  • Earth and Planetary Sciences (miscellaneous)

Cite this

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title = "Comparaison de la distribution statistique de l'{\^a}ge des eaux estim{\'e}e avec des traceurs environnementaux, en utilisant des mod{\`e}les num{\'e}riques de m{\'e}lange binaire et le mod{\`e}le num{\'e}rique d'un karst fractur{\'e} et pliss{\'e}: Vall{\'e}e de Shenandoah, Virginie, et Ouest Virginie, USA",
abstract = "Measured concentrations of environmental tracers in spring discharge from a karst aquifer in the Shenandoah Valley, USA, were used to refine a numerical groundwater flow model. The karst aquifer is folded and faulted carbonate bedrock dominated by diffuse flow along fractures. The numerical model represented bedrock structure and discrete features (fault zones and springs). Concentrations of 3H, 3He, 4He, and CFC-113 in spring discharge were interpreted as binary dilutions of young (0-8 years) water and old (tracer-free) water. Simulated mixtures of groundwater are derived from young water flowing along shallow paths, with the addition of old water flowing along deeper paths through the model domain that discharge to springs along fault zones. The simulated median age of young water discharged from springs (5.7 years) is slightly older than the median age estimated from 3H/3He data (4.4 years). The numerical model predicted a fraction of old water in spring discharge (0.07) that was half that determined by the binary-dilution model using the 3H/3He apparent age and 3H and CFC-113 data (0.14). This difference suggests that faults and lineaments are more numerous or extensive than those mapped and included in the numerical model.",
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