Radionuclide behaviour in the natural environment

Poinssot, Christophe; Geckeis, Horst

doi:10.1016/b978-1-78242-231-0.00003-x

Cited by 6 publications

(7 citation statements)

References 18 publications

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“…The sound understanding of flow and transport processes in heterogeneous porous media is a key requirement for a broad range of applications. This includes the geological storage of nuclear waste (De Marsily et al, ; Poinssot & Geckeis, ), the sequestration of carbon dioxide in deep saline aquifers (Niemi et al, ), aquifer remediation, and the management of groundwater resources (Domenico & Schwartz, ; Freeze & Cherry, ). Flow and transport in groundwater are dominated by spatial heterogeneity in the hydraulic medium properties, which may vary in natural media over more than 12 orders of magnitude (Bear, ; Sanchez‐Vila et al, ).…”

Section: Introductionmentioning

confidence: 99%

Upscaling and Prediction of Lagrangian Velocity Dynamics in Heterogeneous Porous Media

Hakoun

Comolli

Dentz

2019

Water Resources Research

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The understanding of the dynamics of Lagrangian velocities is key for the understanding and upscaling of solute transport in heterogeneous porous media. The prediction of large‐scale particle motion in a stochastic framework implies identifying the relation between the Lagrangian velocity statistics and the statistical characteristics of the Eulerian flow field and the hydraulic medium properties. In this paper, we approach both challenges from numerical and theoretical points of view. Direct numerical simulations of Darcy‐scale flow and particle motion give detailed information on the evolution of the statistics of particle velocities both as a function of travel time and distance along streamlines. Both statistics evolve from a given initial distribution to different steady‐state distributions, which are related to the Eulerian velocity probability density function. Furthermore, we find that Lagrangian velocities measured isochronally as a function of travel time show intermittency dominated by low velocities, which is removed when measured equidistantly as a function of travel distance. This observation gives insight into the stochastic dynamics of the particle velocity series. As the equidistant particle velocities show a regular random pattern that fluctuates on a characteristic length scale, it is represented by two stationary Markov processes, which are parametrized by the distribution of flow velocities and a correlation distance. The velocity Markov models capture the evolution of the Lagrangian velocity statistics in terms of the Eulerian flow properties and a characteristics length scale and shed light on the role of the initial conditions and flow statistics on large‐scale particle motion.

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Section: Introductionmentioning

confidence: 99%

Upscaling and Prediction of Lagrangian Velocity Dynamics in Heterogeneous Porous Media

Hakoun

Comolli

Dentz

2019

Water Resources Research

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“…Fission and activation products are also generated during this industrial process, among them the transuranic elements Np, Pu, Am and Cm. Most of the nuclear waste constituents can be environmental hazards and can have a significant impact on human health . The consequence of the nuclear accidents of 1986 at Chernobyl and of 2011 at Fukushima can be evoked here.…”

Section: Introductionmentioning

confidence: 99%

“…Migration of radionuclides in environmental systems is an important concern. Knowledge of their transport in the environment is crucial, not only for fundamental geochemistry, but also for assessing the risk posed by long‐term storage of nuclear waste .…”

Section: Introductionmentioning

confidence: 99%

“…The consequence of the nuclear accidents of 1986 at Chernobyl and of 2011 at Fukushima can be evoked here. Significant amount of waste radionuclides have already been released to the environment, for example, from the Hanford site and Rocky Flats in the USA and from the Mayak complex in the former USSR .…”

Section: Introductionmentioning

confidence: 99%

“…Potentially mobile, long‐lived fission and activation products are 99 Tc, 135 Cs, 129 I, 79 Se, 14 C, 36 Cl, 41 Ca and 63 Ni. The actinides Np, Pu and Am are usually considered as being immobile . Their chemistry is somewhat complex and they may be mobilized under certain environmental conditions .…”

Section: Introductionmentioning

confidence: 99%

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Affinity capillary electrophoresis in studying the complex formation equilibria of radionuclides in aqueous solutions

Sladkov

2016

Electrophoresis

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Interaction of radionuclides with inorganic and organic species present in natural environment plays an important role in their eventual dispersion. The complex equilibria established in the aqueous phase cause significant changes in the migration properties of radionuclides. Affinity capillary electrophoresis (ACE) can be fruitful in studying these equilibria. This paper reviews the recent methodological advances of the use of ACE in studying the complex equilibria of radionuclides in aqueous solutions. Special attention is paid to the determination of a number of species involved in equilibrium, species constituents (number of ligands, protonated, deprotonated), the influence of ionic strength and temperature on stability constants of complex species formed. Use of ACE for the determination of the main thermodynamic parameters (the molar Gibbs energy (Δ G ), the molar enthalpy (Δ H ) and the molar entropy (Δ S )) of complex formation reactions is also discussed. These data are essential to predict dispersion of radionuclides in the natural environment.

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Features of 90Sr behavior in Crimean lakes with different salinity of their water environment

et al. 2022

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Radionuclide behaviour in the natural environment

Cited by 6 publications

References 18 publications

Upscaling and Prediction of Lagrangian Velocity Dynamics in Heterogeneous Porous Media

Upscaling and Prediction of Lagrangian Velocity Dynamics in Heterogeneous Porous Media

Affinity capillary electrophoresis in studying the complex formation equilibria of radionuclides in aqueous solutions

Features of 90Sr behavior in Crimean lakes with different salinity of their water environment

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