Environmental tracers age dating young groundwater

Progress needs to be made in obtaining representative samples.

Concentrations of He and Ne in excess of solubility equilibrium indicate that the dissolved gases are not fractionated.

The resulting residence-time distribution, or age, of groundwater sampled at a given well is a key property that reflects not only local conditions but in fact global information about the subsurface materials along the historical flow path of the water (Marçais et al., in review; Mc Callum et al., 2014).

With the governing equation of groundwater age distributions (Ginn, 1999) we have begun using isotopic data (Massoudieh and Ginn, 2011) in combination with high-resolution three-dimensional regional groundwater modeling to assess the way that moments of age – e.g., mean and variance – varies with space, and how this reflects sustainability of water resources (Woolfenden and Ginn, 2009; Ginn et al., 2009).

Geochemistry has contributed significantly to the understanding of ground-water systems over the last 50 years.

Historic advances include development of the hydrochemical facies concept, application of equilibrium theory, investigation of redox processes, and radiocarbon dating.

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