Coupled transport-reaction modeling of the long-term interaction between iron, bentonite and Callovo-Oxfordian claystone in radioactive waste confinement systems

Ngo, Viet V.; Delalande, M.; Clément, Alain; Michau, Nicolas; Fritz, Bertrand

doi:10.1016/j.clay.2014.08.020

Cited by 23 publications

(21 citation statements)

References 53 publications

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“…Hydrogeochemical simulations were performed with the 1D thermo-kinetic code KIRMAT (KInectic of Reaction and MAss Transport; Gérard et al, 1998;Ngo et al, 2014;Lucas et al, 2017;Ackerer et al, 2018). KIRMAT is based on the Transition State Theory (TST) and solves the equations describing geochemical reactions and transport mass balance in a porous medium.…”

Section: The Kirmat Reactive-transport Codementioning

confidence: 99%

Determining How Critical Zone Structure Constrains Hydrogeochemical Behavior of Watersheds: Learning From an Elevation Gradient in California's Sierra Nevada

et al. 2020

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Concentration-discharge (C-Q) relations can provide insight into the dynamic behavior of the Critical Zone (CZ), as C-Q relations integrate the spatial distribution and timing of watershed hydrogeochemical processes. This study blends geomorphologic analysis, C-Q relations and reactive-transport modeling using a rich dataset from an elevation gradient of eight watersheds in the Southern Sierra Nevada, California. We found that the CZ structure exerts a strong control on the C-Q relations, and on the hydrogeochemical behavior of headwater watersheds. Watersheds with thin regolith, a large stream network, and limited water storage have fast mean transit times along subsurface flow lines, and show limited seasonal variability in ionic concentrations in streamflow (i.e., chemostatic behavior). In contrast, watersheds with thicker regolith, a small stream network and more water storage have longer transit times along subsurface flow lines, and exhibit greater chemical variability (i.e., chemodynamic behavior). Independent estimates of mean transit times and water storage from other isotopic, hydrologic and geophysical studies were consistent with results from modeling C-Q relations. The stream chemistry and its variability were controlled by lateral flow within the regolith, and no mixing with deep groundwater was needed to explain the observed chemical variability. This study opens the possibility to estimate water-storage capacity and mean transit times, and thus drought resistance in watersheds, by using quantitative modeling of C-Q relations.

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Section: The Kirmat Reactive-transport Codementioning

confidence: 99%

Determining How Critical Zone Structure Constrains Hydrogeochemical Behavior of Watersheds: Learning From an Elevation Gradient in California's Sierra Nevada

et al. 2020

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“…The corrosion products predicted by the models are dominated by magnetite, along with Fe-carbonates (Ca-siderite, chukanovite) and Fe-silicates (greenalite, cronstedtite, berthierine) in the dense layer. In some cases, the precipitation of magnetite is only transient, usually due to competition with iron silicates, especially when high reactive surface areas and/or precipitation rate for secondary minerals are used Savage et al, 2010a;Ngo et al, 2014).…”

Section: Steel Corrosion In Claymentioning

confidence: 99%

Stability of Clay Barriers Under Chemical Perturbations

Bildstein

Claret

2015

Natural and Engineered Clay Barriers

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“…with a term considering the departure from equilibrium considering reaction (3). This assumption results in a progressive decrease of the corrosion rate, usually by an order of magnitude over a period of 100 000 years (Marty et al 2010;Lu et al 2011;Ngo et al 2014). Note that a decrease of the corrosion rate is also achieved, to some extent, by considering that the reactive surface area depends on the amount of iron and on porosity (Bildstein et al 2006;Savage et al 2010;Wersin and Birgersson 2014).…”

Section: A Decade Of Rtm Evolution Of Simulations At the Scale Of Thementioning

confidence: 99%

RTM for Waste Repositories

Bildstein

Claret

Frugier

2019

Reviews in Mineralogy and Geochemistry

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Coupled transport-reaction modeling of the long-term interaction between iron, bentonite and Callovo-Oxfordian claystone in radioactive waste confinement systems

Cited by 23 publications

References 53 publications

Determining How Critical Zone Structure Constrains Hydrogeochemical Behavior of Watersheds: Learning From an Elevation Gradient in California's Sierra Nevada

Determining How Critical Zone Structure Constrains Hydrogeochemical Behavior of Watersheds: Learning From an Elevation Gradient in California's Sierra Nevada

Stability of Clay Barriers Under Chemical Perturbations

RTM for Waste Repositories

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