Groundwater Age Assessment and Isotopic Analysis
Summary
This field focuses on estimating the time since water entered and moved through subsurface aquifers, combining isotopic tracers with hydrogeological models. By analysing the concentrations of naturally occurring radioisotopes and stable isotopes in dissolved water samples, researchers can reconstruct recharge rates, flow paths and residence times. Techniques such as radiocarbon dating of dissolved inorganic carbon, chlorofluorocarbon dating, krypton-81 and tritium–helium methods reveal age distributions and mixing processes within multi-layer aquifers. This information is indispensable for sustainable groundwater management, contaminant risk assessment and predicting aquifer responses to climatic or anthropogenic stress. Recent advances integrate high-resolution numerical flow modelling with multi-tracer datasets, enabling quantitative mapping of groundwater flow dynamics even in data-scarce regions. Global applications range from assessing the vulnerability of arid basins to over-abstraction, to characterising thermal spring recharge and deep geothermal circulation. Ultimately, the synergy of isotopic tools and hydrogeochemical modelling delivers a comprehensive framework to safeguard groundwater resources and guide policy decisions.
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Groundwater Age Assessment and Isotopic Analysis publication trend
The graph below shows the total number of articles in groundwater age assessment and isotopic analysis across all publications each year (not limited to Nature Index journals).
Technical terms
Radiocarbon dating (14C dating): Measurement of the decay of carbon-14 in dissolved inorganic carbon to estimate groundwater residence time up to ~40 000 years.
Stable isotopes: Non-radioactive isotopes (e.g. 2H, 18O) used to trace water sources, evaporation effects and mixing processes within aquifers.
Chlorofluorocarbon (CFC) dating: Use of CFC concentrations in groundwater to determine recharge ages over the past 70 years.
Residence time: The average time water spends in an aquifer from recharge to discharge.
Numerical groundwater flow model: A computational representation of groundwater movement, calibrated with hydraulic and tracer data to simulate age distributions.
Recharge: The process by which surface water infiltrates to replenish an aquifer.
References
- Quantifying aquifer interaction using numerical groundwater flow model evaluated by environmental water tracer data: Application to the data-scarce area of the Bandung groundwater basin, West Java, Indonesia. Journal of Hydrology Regional Studies (2023).
- Hydrogeochemical and environmental isotope study of Topusko thermal waters, Croatia. Environmental Geochemistry and Health (2024).
- Distributions of Groundwater Age under Climate Change of Thailand’s Lower Chao Phraya Basin. Water (2020).
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