Modelling of a Large-scale In-situ Migration Experiment with 14C-labelled Natural Organic Matter in Boom Clay

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@article{cd747466151b4af19e2392d622df2307,
title = "Modelling of a Large-scale In-situ Migration Experiment with 14C-labelled Natural Organic Matter in Boom Clay",
abstract = "For the assessment of the long-term safety of a geological disposal of high- and intermediate level radioactive waste and/or spent fuel in the Boom Clay, a better understanding of the migration behaviour of Natural Organic Matter (NOM) is needed because it can act as a carriermolecule for radionuclides. Therefore, a large-scale in-situ migration experiment with 14C-labelled NOM was performed to study the NOM migration behaviour on a large scale (m), on the long-term (> 10 years) and in directions parallel and perpendicular to the bedding plane (transport anisotropy). The numerical modelling tool HYDRUS2D/3D was used to interpret the results. The model was built stepwise, testing the influence of advection, colloid attachment/detachment and anisotropy. The upscaling of previously determined parameters from small scale lab tests was also tested. A classic diffusion-advection description, using parameter values in the range of those obtained in the lab tests, provided already reasonable results. Inclusion of a colloid filtration term in the model significantly improved the simulation. Finally, the model was succesfully tested against a second dataset and the anisotropy of the Boom clay was brought into account.",
keywords = "organic matter, Boom Clay, transport modelling",
author = "Evelien Martens and Norbert Maes and Eef Weetjens and {Van Gompel}, Marc and {Van Ravestyn}, Louis",
note = "Score = 10",
year = "2010",
month = "11",
doi = "10.1524/ract.2010.1770",
language = "English",
volume = "98",
pages = "695--701",
journal = "Radiochimica Acta",
issn = "0033-8230",
publisher = "R. Oldenbourg",
number = "9-11",

}

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TY - JOUR

T1 - Modelling of a Large-scale In-situ Migration Experiment with 14C-labelled Natural Organic Matter in Boom Clay

AU - Martens, Evelien

AU - Maes, Norbert

AU - Weetjens, Eef

AU - Van Gompel, Marc

AU - Van Ravestyn, Louis

N1 - Score = 10

PY - 2010/11

Y1 - 2010/11

N2 - For the assessment of the long-term safety of a geological disposal of high- and intermediate level radioactive waste and/or spent fuel in the Boom Clay, a better understanding of the migration behaviour of Natural Organic Matter (NOM) is needed because it can act as a carriermolecule for radionuclides. Therefore, a large-scale in-situ migration experiment with 14C-labelled NOM was performed to study the NOM migration behaviour on a large scale (m), on the long-term (> 10 years) and in directions parallel and perpendicular to the bedding plane (transport anisotropy). The numerical modelling tool HYDRUS2D/3D was used to interpret the results. The model was built stepwise, testing the influence of advection, colloid attachment/detachment and anisotropy. The upscaling of previously determined parameters from small scale lab tests was also tested. A classic diffusion-advection description, using parameter values in the range of those obtained in the lab tests, provided already reasonable results. Inclusion of a colloid filtration term in the model significantly improved the simulation. Finally, the model was succesfully tested against a second dataset and the anisotropy of the Boom clay was brought into account.

AB - For the assessment of the long-term safety of a geological disposal of high- and intermediate level radioactive waste and/or spent fuel in the Boom Clay, a better understanding of the migration behaviour of Natural Organic Matter (NOM) is needed because it can act as a carriermolecule for radionuclides. Therefore, a large-scale in-situ migration experiment with 14C-labelled NOM was performed to study the NOM migration behaviour on a large scale (m), on the long-term (> 10 years) and in directions parallel and perpendicular to the bedding plane (transport anisotropy). The numerical modelling tool HYDRUS2D/3D was used to interpret the results. The model was built stepwise, testing the influence of advection, colloid attachment/detachment and anisotropy. The upscaling of previously determined parameters from small scale lab tests was also tested. A classic diffusion-advection description, using parameter values in the range of those obtained in the lab tests, provided already reasonable results. Inclusion of a colloid filtration term in the model significantly improved the simulation. Finally, the model was succesfully tested against a second dataset and the anisotropy of the Boom clay was brought into account.

KW - organic matter

KW - Boom Clay

KW - transport modelling

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_109126

UR - http://knowledgecentre.sckcen.be/so2/bibref/7329

U2 - 10.1524/ract.2010.1770

DO - 10.1524/ract.2010.1770

M3 - Article

VL - 98

SP - 695

EP - 701

JO - Radiochimica Acta

JF - Radiochimica Acta

SN - 0033-8230

IS - 9-11

ER -

ID: 337297