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- Title
Tritium-helium 3 dating under complex conditions in hydraulically stressed areas of a buried-valley aquifer.
- Authors
Shapiro, Stephanie Dunkle; Rowe, Gary; Schlosser, Peter; Ludin, Andrea; Stute, Martin
- 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.
- Publication
Water Resources Research, 1998, Vol 34, Issue 5, p1165
- ISSN
0043-1397
- Publication type
Article
- DOI
10.1029/97WR03322