Tritium 3he dating of shallow groundwater
Tritium 3he dating of shallow groundwater - validating while unmarshalling
Recharge rates have been computed using the 3H/3He age gradients and vary from 62 cm yr-1 beneath the Borden landfill to 14 cm yr-1 north of the landfill. The 3H/3He-computed recharge agrees well with the recharge function used in previous flow modelling.
The correspondence between the 3H/3He and CFC ages indicates that dispersion has had a minimal effect on the tracer-based ages of water in this aquifer.
Massmann, “Infiltration of River Water into the Groundwater Investigations and Modelling of Hydraulic and Geochemical Processes in the Oderbruch Aquifer, Germany,” Ph.
Merzb, “Redox Processes in the Oderbruch Polder Groundwater Flow System in Germany,” Applied Geochemistry, Vol.
Apparent groundwater ages based on CFC- and He-dating techniques and model-based travel times could not be statistically differentiated, and all were strongly correlated with depth.
Confinement of 3He was high because of the rapid vertical flow velocity (of the order of 1 m/yr), resulting in clear delineation of groundwater travel times based on the He and CFC ages indicates that dispersion has had a minimal effect on the tracer-based ages of water in this aquifer.
Cherry, “Tritium and Helium 3 as Groundwater Age Tracers in the Borden Aquifer,” Water Resources Research, Vol.
Clark, “A 3H/3He Study of Groundwater Flow in a Fractured Bedrock Aquifer,” Ground Water, Vol. Schlosser, “Age Dating of Ground Water Using Chlorofluorocarbons, Tritium/Helium: 3, and Flow Path Analysis in an Unconfined Aquifer of the New Jersey Coastal Plain,” Water Resources Research, Vol. Michel, “Flow of River Water into a Karstic Limestone Aquifer. Dating the Young Fraction in Groundwater Mixtures in the Upper Floridan Aquifer near Valdosta, Georgia,” Applied Geochemistry, Vol. Computed 3H/3He age profiles are compared with travel times predicted using a previously calibrated flow model. Helium 3 confinement is strong while dispersive mixing is weak in the Borden aquifer, resulting in an excellent delineation of groundwater travel times.He)) and groundwater flow path analysis is useful for investigating groundwater travel times, flow patterns, and recharge rates, as demonstrated by this study of the homogeneous shallow, unconfined Kirkwood-Cohansey aquifer system in the southern New Jersey coastal plain.