Groundwater Discharge Assessment Using Environmental Tracers
Summary
Groundwater discharge, the flow of subsurface water into surface water bodies or the sea, plays a critical role in global water budgets, ecosystem function and contaminant transport. Environmental tracers—naturally occurring or introduced substances whose distribution reflects hydrological processes—are employed to quantify rates and pathways of discharge. Common tracers include short‐lived radionuclides such as radon-222, conservative major ions, stable water isotopes (δ18O and δ2H), and thermal anomalies detected via remote sensing. By establishing mass balances of tracers, researchers can distinguish groundwater inputs from direct precipitation and surface inflow, assess aquifer–surface connectivity, and evaluate temporal variability from seasonal cycles to long-term climatic shifts. Applications span lacustrine, fluvial, coastal and submarine environments, informing water resource management, pollution mitigation and biogeochemical cycling at regional to global scales.
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Groundwater Discharge Assessment Using Environmental Tracers publication trend
The graph below shows the total number of articles in groundwater discharge assessment using environmental tracers across all publications each year (not limited to Nature Index journals).
Technical terms
Environmental tracer: A chemical or isotopic constituent used to trace the origin, age or movement of water.
Mass balance approach: A calculation that accounts for all inputs, outputs and transformations of a tracer within a defined system to quantify a process rate.
Stable water isotopes: Non-radioactive forms of water molecules differing in oxygen or hydrogen isotopic composition, used to fingerprint water sources.
Radon-222: A naturally occurring radioactive noble gas with a half-life of 3.8 days, employed as a tracer for groundwater discharge.
Submarine groundwater discharge: The flow of groundwater into the ocean, carrying dissolved constituents from land to coastal waters.
References
- The contribution of groundwater discharge to the overall water budget of two typical Boreal lakes in Alberta/Canada estimated from a radon mass balance. Hydrology and Earth System Sciences (2010).
- Characterizing interactions between surface water and groundwater in the Jialu River basin using major ion chemistry and stable isotopes. Hydrology and Earth System Sciences (2012).
- Submarine Groundwater Discharge at a Single Spot Location: Evaluation of Different Detection Approaches. Water (2014).
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