Tritium-helium 3 dating under complex conditions in hydraulically stressed areas of a buried-valley aquifer

Stephanie Dunkle Shapiro, Gary Rowe, Peter Schlosser, Andrea Ludin, Martin Stute

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The 3H-3He dating method is applied in a buried-valley aquifer near Dayton, Ohio. The study area is large, not all sampling locations lie along well-defined flow paths, and existing wells with variable screen lengths and diameters are used. Reliable use of the method at this site requires addressing several complications: (1) The flow system is disturbed because of high pumping rates and induced infiltration; (2) tritium contamination is present in several areas of the aquifer; and (3) radiogenic helium concentrations are elevated in a significant number of the wells. The 3H-3He ages are examined for self-consistency by comparing the reconstructed tritium evolution to the annual weighted tritium measured in precipitation; deviations result from dispersion, tritium contamination, and mixing. The 3H-3He ages are next examined for consistency with chlorofluorocarbon ages, the agreement is poor because of degradation of CFCs. Finally, the 3H-3He ages are examined for consistency with the current understanding of local hydrologic processes; the ages are generally supported by hydrogeologic data and the results of groundwater flow modeling coupled with particle-tracking analyses.

Original languageEnglish (US)
Pages (from-to)1165-1180
Number of pages16
JournalWater Resources Research
Volume34
Issue number5
DOIs
StatePublished - Jan 1 1998
Externally publishedYes

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tritium
helium
aquifer
valley
CFC
well
dating method
flow modeling
groundwater flow
pumping
infiltration
dating
degradation
sampling
contamination

ASJC Scopus subject areas

  • Water Science and Technology

Cite this

Tritium-helium 3 dating under complex conditions in hydraulically stressed areas of a buried-valley aquifer. / Shapiro, Stephanie Dunkle; Rowe, Gary; Schlosser, Peter; Ludin, Andrea; Stute, Martin.

In: Water Resources Research, Vol. 34, No. 5, 01.01.1998, p. 1165-1180.

Research output: Contribution to journalArticle

Shapiro, Stephanie Dunkle ; Rowe, Gary ; Schlosser, Peter ; Ludin, Andrea ; Stute, Martin. / Tritium-helium 3 dating under complex conditions in hydraulically stressed areas of a buried-valley aquifer. In: Water Resources Research. 1998 ; Vol. 34, No. 5. pp. 1165-1180.
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