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- W1678753896 abstract "[1] Large-scale dispersion was studied in an unconsolidated, sandy, glaciofluvial, river-recharged, and confined aquifer in Germany. Groundwater observation wells from a 3.5-km-long transect located in flow direction from the river Oder into a large lowland area (Oderbruch polder) were sampled for noble gases in order to date the groundwater with the tritium and helium (3H-3He) technique. The apparent 3H-3He ages of the groundwater increased from only a few months to >40 years along the flow path. Highest values for initial 3H (sum of 3H and its decay product tritiogenic helium, 3Hetri) were encountered in 2.6-km river distance. Concentrations of 4He in the water increased to 1.1 × 10−7 cm3 STP/g with distance from the river. The initial 3H data enabled an estimation of the longitudinal dispersivity with a simplified one-dimensional transport model. The best fit of modeled and measured initial 3H data was obtained using a dispersivity of 120 m. Deviations of modeled hydraulic ages and measured apparent 3H-3He ages for older samples can be explained by dispersive mixing." @default.
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- W1678753896 date "2009-02-01" @default.
- W1678753896 modified "2023-10-12" @default.
- W1678753896 title "Analysis of long-term dispersion in a river-recharged aquifer using tritium/helium data" @default.
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- W1678753896 doi "https://doi.org/10.1029/2007wr006746" @default.
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