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Modeling cesium migration through Opalinus clay: a benchmark for single- and multi-species sorption-diffusion models

Águila, Jesús F.; Montoya, Vanessa 1; Samper, Javier; Montenegro, Luis; Kosakowski, Georg; Krejci, Philipp; Pfingsten, Wilfried
1 Institut für Nukleare Entsorgung (INE), Karlsruher Institut für Technologie (KIT)

Abstract:

Sophisticated modeling of the migration of sorbing radionuclides in compacted claystones is needed for supporting the safety analysis of deep geological repositories for radioactive waste, which requires robust modeling tools/codes. Here, a benchmark related to a long term laboratory scale diffusion experiment of cesium, a moderately sorbing radionuclide, through Opalinus clay is presented. The benchmark was performed with the following codes: CORE$^{2D}$V5, Flotran, COMSOL Multiphysics, OpenGeoSys-GEM, MCOTAC and PHREEQC v.3. The migration setup was solved with two different conceptual models, i) a single-species model by using a look-up table for a cesium sorption isotherm and ii) a multi-species diffusion model including a complex mechanistic cesium sorption model. The calculations were performed for three different cesium boundary concentrations (10$^{-3}$, 10$^{-5}$, 10$^{-7}$ mol / L) to investigate the models/codes capabilities taking into account the nonlinear sorption behavior of cesium. Generally, good agreement for both single- and multi-species benchmark concepts could be achieved, however, some discrepancies have been identified, especially near the boundaries, where code specific spatial (and time) discretization had to be improved to achieve better agreement at the expense of longer computation times. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000133219
Veröffentlicht am 22.05.2021
Originalveröffentlichung
DOI: 10.1007/s10596-021-10050-5
Scopus
Zitationen: 6
Web of Science
Zitationen: 6
Dimensions
Zitationen: 7
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.2021
Sprache Englisch
Identifikator ISSN: 1420-0597, 1573-1499
KITopen-ID: 1000133219
HGF-Programm 32.11.01 (POF IV, LK 01) Nuclear Waste Disposal
Erschienen in Computational Geosciences
Verlag Springer
Band 25
Heft 4
Seiten 1405–1436
Vorab online veröffentlicht am 24.04.2021
Nachgewiesen in Dimensions
Scopus
Web of Science
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