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

Water Resources Research

By:
, , , , and
https://doi.org/10.1029/97WR03322

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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. 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.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Tritium-helium 3 dating under complex conditions in hydraulically stressed areas of a buried-valley aquifer
Series title:
Water Resources Research
DOI:
10.1029/97WR03322
Volume:
34
Issue:
5
Year Published:
1998
Language:
English
Publisher:
American Geophysical Union
Description:
16 p.
First page:
1165
Last page:
1180
Country:
United States
State:
Ohio
City:
Dayton