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Apports des traceurs environnementaux à la connaissance de l’âge des eaux souterraines

Abstract : Environmental tracers are relevant tools for understanding the water cycle and particularly for understanding the circulation of groundwater. Groundwater is indeed invisible to humans most of the time and circulates in complex and heterogeneous geological environments. This resource suffers from serious anthropogenic impacts due to its overexploitation, especially in arid regions. It also undergoes a degradation of its chemical, even bacteriological quality by the use in particular of pollutants on the surface of the ground. Water stocks, their evolution and their vulnerability must therefore be estimated. Understanding of the groundwater cycle is accessible, in particular through the use of chemical compounds such as environmental tracers, which will integrate the water molecule, or dissolve in water and follow it along it course in the rocks. Knowledge of the origin of these tracers in water and their evolution, coupled with high-performance analytical techniques, should make it possible to reconstruct the history of these waters, in terms of residence time, mixtures, and geographical origin. The water age ranges estimated by these tracers go from a few days to several million years and therefore cover almost all of the water ages in the ground. Analytical techniques have progressed considerably from the second half of the 20th century, to allow these tracers to be measured at extremely low concentrations, with increasingly reduced volumes of water, thus allowing their democratization in the world scientific community. The interpretation models for these tracers have also been greatly developed in order to better consider the advective, dispersive and diffusive processes of water and associated tracers.
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https://theses.hal.science/tel-03238497
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Submitted on : Thursday, May 27, 2021 - 10:30:08 AM
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  • HAL Id : tel-03238497, version 1

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Thierry Labasque. Apports des traceurs environnementaux à la connaissance de l’âge des eaux souterraines. Sciences de la Terre. Université Rennes 1, 2020. Français. ⟨NNT : 2020REN1B031⟩. ⟨tel-03238497⟩

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