Groundwater Age and Groundwater Age Dating
Tóm tắt
A new way of thinking about groundwater age is changing the field of groundwater age dating. Following a rigorous definition of age, a groundwater sample is seen not as water that recharged the flow regime at a point in the past, but as a mixture of waters that have resided in the subsurface for varying lengths of time. This recognition resolves longstanding inconsistencies encountered in age dating and suggests new ways to carry out age dating studies. Tomorrow's studies will likely employ sets of marker isotopes and molecules spanning a broad spectrum of age and incorporate a wide range of chemical and physical data collected from differing stratigraphic levels. The observations will be inverted using reactive transport modeling, allowing flow to be characterized not in one direction along a single aquifer, but in two or three dimensions over an entire flow regime.
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Tài liệu tham khảo
Berger PM, 2008, An optimization approach to groundwater age dating: How old is water in the Paris basin?
Bethke CM, Lee M-K, Park J. 2002. Basin Modeling with Basin2, Release 5. Urbana:Hydrogeol. Prog., Univ. Illinois. 205 pp. http://www.geology.uiuc.edu/Hydrogeology
Clark ID, Fritz P. 1997. Environmental Isotopes in Hydrology. Boca Raton, FL: Lewis. 328 pp.
Doherty J, 2004, PEST: Model-Independent Parameter Estimation, User Manual, 5
Fontes JC, 1983, Guidebook on Nuclear Techniques in Hydrology
Freeze RA, Cherry JA. 1979. Groundwater. Engelwood Cliffs, NJ: Prentice Hall. 604 pp.
Goode DJ. 1998. Ground-water age and atmospheric tracers: simulation studies and analysis of field data from the Mirror Lake site, New Hampshire. PhD thesis. Princeton Univ. 194 pp. http://pa.water.usgs.gov/projects/frhr/thesis.html
Morgenstern U, 2000, Environmental Tracers in Subsurface Hydrology, 498
Poeter EP, 2005, U.S. Geol. Surv. Tech. Methods 6-A11