Modelling transport of reactive tracers in a heterogeneous crystalline rock matrix

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http://hdl.handle.net/10138/307863

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Svensson , U , Voutilainen , M , Muuri , E , Ferry , M & Gylling , B 2019 , ' Modelling transport of reactive tracers in a heterogeneous crystalline rock matrix ' , Journal of Contaminant Hydrology , vol. 227 , 103552 . https://doi.org/10.1016/j.jconhyd.2019.103552

Title: Modelling transport of reactive tracers in a heterogeneous crystalline rock matrix
Author: Svensson, Urban; Voutilainen, Mikko; Muuri, Eveliina; Ferry, Michel; Gylling, Björn
Contributor: University of Helsinki, Particle Physics and Astrophysics
University of Helsinki, Geological disposal of spent nuclear fuel
Date: 2019-12
Language: eng
Number of pages: 16
Belongs to series: Journal of Contaminant Hydrology
ISSN: 0169-7722
URI: http://hdl.handle.net/10138/307863
Abstract: A numerical reactive transport model for crystalline rocks is developed and evaluated. The model is based on mineral maps generated by X-ray micro computed tomography (X-μCT); the maps used have a resolution of approximately 30 μm and the rock samples are on the cm scale. A computational grid for the intergranular space is generated and a micro-DFN (Discrete Fracture Network) model governs the grid properties. A particle tracking method (Time Domain Random Walk) is used for transport simulations. The basic concept of the model can now be formulated as follows; “when a particle is close to a reactive mineral surface it has a certain probability to get sorbed during a certain time span. Once sorbed it will remain so a certain time”. The model requires a number of input parameters that represent the sorption properties of the reactive minerals. Attempts are made to relate the parameters to traditional distribution parameters. The model is evaluated by comparisons with recent laboratory experimental data. These experiments consider two rock types (veined gneiss and pegmatitic granite) and two radionuclides (cesium and barium). It is concluded that the new reactive transport model can simulate the experimental data in a consistent and realistic way.
Subject: BA-133
DIFFUSION
DYNAMIC UPDATE
MEDIA
OLKILUOTO
POROSITY
SAMPLES
SIMULATION
SORPTION
114 Physical sciences
116 Chemical sciences
1171 Geosciences
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