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Modélisation géochimique des fractionnements isotopiques avec le code de transport réactif Hytec et applications environnementales

Abstract : The scope of geochemical processes modeled by reactive transport codes is widening and allows these codes to address different type of problematics (radioactive waste storage, mining, contamination, etc.). The last decade saw the rise of the isotopic fractionation modeling with reactive transport codes. This functionality allows tracing geochemical processes in amore precise way, using geochemical reactions and the isotopic fractionation they induce. However, the traditionally used hypothesis to model isotopic fractionation relies on the existence of a major isotope for the studied element. This work, prepared at MINES ParisTech, contains mathematical developments to support the methodology a set of less constraining hypotheses, easily verified in the majority of natural systems. Several application cases were performed with Hytec, are active transport code developed at MINES ParisTech. The comparison of isotopic fractionation simulation results in a benchmark study acts as a validation of this methodology with Hytec.Then, a model of degradation and migration of chlorinated solvents in an aquifer-aquitard system was built step by step. This model allows simulating the isotopic signatures of carbon and chlorine in these components. Results showed that data extracted from the aquifer brings information about the reactivity of the aquitard regarding the solvent degradation. Furthermore, results also highlight the importance of the choice of model parameters and the potential of isotopic fractionation modeling combined to theversatility of Hytec.
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Submitted on : Tuesday, September 28, 2021 - 9:50:11 AM
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  • HAL Id : tel-03356435, version 1


Manon Lincker. Modélisation géochimique des fractionnements isotopiques avec le code de transport réactif Hytec et applications environnementales. Géochimie. Université Paris sciences et lettres, 2020. Français. ⟨NNT : 2020UPSLM071⟩. ⟨tel-03356435⟩



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