Multiphase flow and reactive transport benchmark for radioactive waste disposal

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24220%2F24%3A00013203" target="_blank" >RIV/46747885:24220/24:00013203 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/article/10.1007/s12665-024-11887-6" target="_blank" >https://link.springer.com/article/10.1007/s12665-024-11887-6</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s12665-024-11887-6" target="_blank" >10.1007/s12665-024-11887-6</a>

Result language

angličtina

Original language name

Multiphase flow and reactive transport benchmark for radioactive waste disposal

Original language description

Compacted bentonite is part of the multi-barrier system of radioactive waste repositories. The assessment of the long-term performance of the barrier requires using reactive transport models. Here we present a multiphase flow and reactive transport benchmark for radioactive waste disposal. The numerical model deals with a 1D column of unsaturated bentonite through which water, dry air and may flow and with the following reactions; aqueous complexation, calcite and gypsum dissolution/precipitation, cation exchange and gas dissolution. INVERSE-FADES-CORE V2, , TOUGHREACT and iCP were benchmarked with 6 test cases of increasing complexity, starting with conservative tracer transport under variably unsaturated conditions and ending with water flow, gas diffusion, minerals and cation exchange. The solutions of all codes exhibit similar trends. Small discrepancies are found in conservative tracer transport due to differences in hydrodynamic dispersion. Computed pressures agree when a sufficiently refined grid is used. Small discrepancies in and pH are found near the no-flow boundary at early times which vanish later. Discrepancies are due differences in the formulations used for gas flow at nearly water-saturated conditions. Computed pressures show a fluctuation between and years which slows down the in-diffusion of . This fluctuation is associated with chemical reactions involving . There are discrepancies in solute concentrations due to differences in the Debye–Hückel (DH) formulation. They are overcome when all codes use the same DH formulation. The results of this benchmark will contribute to increase the confidence on multiphase reactive transport models for radioactive waste disposal.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

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Continuities

R - Projekt Ramcoveho programu EK

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

ENVIRONMENTAL EARTH SCIENCES

ISSN

1866-6280

e-ISSN

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Volume of the periodical

83

Issue of the periodical within the volume

22

Country of publishing house

DE - GERMANY

Number of pages

23

Pages from-to

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UT code for WoS article

001348473400006

EID of the result in the Scopus database

2-s2.0-85208721400