Articles | Volume 29, issue 22
https://doi.org/10.5194/hess-29-6577-2025
https://doi.org/10.5194/hess-29-6577-2025
Research article
 | 
21 Nov 2025
Research article |  | 21 Nov 2025

Transport behavior displayed by water isotopes and potential implications for assessment of catchment properties

Dan Elhanati, Erwin Zehe, Ishai Dror, and Brian Berkowitz

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Short summary
Measurements of water isotopes are often used to estimate water transit time distributions and aquifer storage thickness in catchments. However, laboratory-scale measurements show that water isotopes exhibit transport behavior identical to that of inert chemical tracers rather than of pure water. The measured mean tracer and apparent mean water velocities are not necessarily equal; recognition of this inequality is critical when estimating catchment properties such as aquifer storage thickness.
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