Determining timescales for groundwater flow and solute transport

By:  and 
Edited by: Peter G. Cook and Andrew L. Herczeg



One of the principal uses of environmental tracers is for determining the ages of soil waters and groundwaters. (We may refer to this as ‘hydrochronology’by analogy with the dating of solid materials known as geochronology.) Information on soil water and groundwater age enables timescales for a range of subsurface processes to be determined. For example, ‘groundwater stratigraphy’is used increasingly to decipher past recharge rates and conditions in unconfined aquifers, in much the same way that sedimentary stratigraphy yields information about past depositional environments. The use of environmental tracers to determine water ages allows groundwater recharge rates and flow velocities to be determined independently, and commonly more accurately, than with traditional hydraulic methods where hydraulic properties of aquifers are poorly known or spatially variable. Studies of groundwater residence times in association with groundwater contamination studies can enable historic release rates of contaminants and contaminant transport rates to be determined. Where input rates are known, measurements of groundwater contaminant concentrations, together with groundwater dating, can sometimes be used for estimating chemical reaction rates. The combination of these dating methods with stable isotope measurements has sometimes allowed changes in contaminant sources over time to be determined.

Publication type Book chapter
Publication Subtype Book Chapter
Title Determining timescales for groundwater flow and solute transport
ISBN 978-1-4613-7057-4
DOI 10.1007/978-1-4615-4557-6_1
Year Published 2000
Language English
Publisher Springer
Publisher location Boston
Contributing office(s) National Research Program - Eastern Branch, Toxic Substances Hydrology Program
Description 30 p.
Larger Work Type Book
Larger Work Subtype Monograph
Larger Work Title Environmental tracers in subsurface hydrology
First page 1
Last page 30
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