Comparison of parameter sensitivities between a laboratory and field-scale model of uranium transport in a dual domain, distributed rate reactive system.
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| Title: | Comparison of parameter sensitivities between a laboratory and field-scale model of uranium transport in a dual domain, distributed rate reactive system. |
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| Authors: | Greskowiak, J.1, Prommer, H.1,2, Liu, C.3, Post, V. E. A.4,5, Ma, R.6, Zheng, C.6, Zachara, J. M.3 |
| Source: | Water Resources Research. 2010, Vol. 46 Issue 9, pn/a-n/a. 13p. |
| Subjects: | Uranium, Sensitivity analysis, Complexation reactions, Groundwater flow, Radioactive contamination, Zone of aeration |
| Abstract: | A laboratory-derived conceptual and numerical model for U(VI) transport at the Hanford 300A site, Washington, USA, was applied to a range of field-scale scenarios of different geochemical complexity to identify the importance of individual processes in controlling the fate of U(VI), as well as to elucidate the characteristic differences between well-defined laboratory and the more complex field-scale conditions. Therefore, a rigorous sensitivity analysis was carried out for the various simulation scenarios. The underlying conceptual and numerical model, originally developed from column experiment data, includes distributed rate surface complexation kinetics of U(VI), aqueous speciation, and physical nonequilibrium transport processes. The field scenarios accounted additionally for highly transient groundwater flow and variable geochemical conditions driven by frequent water level changes of the nearby Columbia River. The results of the sensitivity analysis showed not only similarities but also important differences in parameter sensitivities between the laboratory and field-scale models. It was found that the actual degree of sorption disequilibrium, actual concentration of sorbed U(VI), and the sorption extent (i.e., theoretical concentration of sorbed U(VI) at equilibrium) are the major controls for the magnitude of the calculated parameter sensitivities. These internal model variables depended mainly on (1) the groundwater flow conditions, i.e., the relatively long phases of limited groundwater movement in the field scale (intercepted by short peak flow events) and the long sustained flow phases in the column experiment (intercepted by relatively short stop flow events), and (2) the sampling location in the field-scale model, i.e., plume fringe versus plume center. [ABSTRACT FROM AUTHOR] |
| Copyright of Water Resources Research is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 87147038 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Comparison of parameter sensitivities between a laboratory and field-scale model of uranium transport in a dual domain, distributed rate reactive system. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Greskowiak%2C+J%2E%22">Greskowiak, J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Prommer%2C+H%2E%22">Prommer, H.</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Liu%2C+C%2E%22">Liu, C.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Post%2C+V%2E+E%2E+A%2E%22">Post, V. E. A.</searchLink><relatesTo>4,5</relatesTo><br /><searchLink fieldCode="AR" term="%22Ma%2C+R%2E%22">Ma, R.</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Zheng%2C+C%2E%22">Zheng, C.</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Zachara%2C+J%2E+M%2E%22">Zachara, J. M.</searchLink><relatesTo>3</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Water+Resources+Research%22">Water Resources Research</searchLink>. 2010, Vol. 46 Issue 9, pn/a-n/a. 13p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Uranium%22">Uranium</searchLink><br /><searchLink fieldCode="DE" term="%22Sensitivity+analysis%22">Sensitivity analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Complexation+reactions%22">Complexation reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Groundwater+flow%22">Groundwater flow</searchLink><br /><searchLink fieldCode="DE" term="%22Radioactive+contamination%22">Radioactive contamination</searchLink><br /><searchLink fieldCode="DE" term="%22Zone+of+aeration%22">Zone of aeration</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: A laboratory-derived conceptual and numerical model for U(VI) transport at the Hanford 300A site, Washington, USA, was applied to a range of field-scale scenarios of different geochemical complexity to identify the importance of individual processes in controlling the fate of U(VI), as well as to elucidate the characteristic differences between well-defined laboratory and the more complex field-scale conditions. Therefore, a rigorous sensitivity analysis was carried out for the various simulation scenarios. The underlying conceptual and numerical model, originally developed from column experiment data, includes distributed rate surface complexation kinetics of U(VI), aqueous speciation, and physical nonequilibrium transport processes. The field scenarios accounted additionally for highly transient groundwater flow and variable geochemical conditions driven by frequent water level changes of the nearby Columbia River. The results of the sensitivity analysis showed not only similarities but also important differences in parameter sensitivities between the laboratory and field-scale models. It was found that the actual degree of sorption disequilibrium, actual concentration of sorbed U(VI), and the sorption extent (i.e., theoretical concentration of sorbed U(VI) at equilibrium) are the major controls for the magnitude of the calculated parameter sensitivities. These internal model variables depended mainly on (1) the groundwater flow conditions, i.e., the relatively long phases of limited groundwater movement in the field scale (intercepted by short peak flow events) and the long sustained flow phases in the column experiment (intercepted by relatively short stop flow events), and (2) the sampling location in the field-scale model, i.e., plume fringe versus plume center. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Water Resources Research is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1029/2009WR008781 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: n/a Subjects: – SubjectFull: Uranium Type: general – SubjectFull: Sensitivity analysis Type: general – SubjectFull: Complexation reactions Type: general – SubjectFull: Groundwater flow Type: general – SubjectFull: Radioactive contamination Type: general – SubjectFull: Zone of aeration Type: general Titles: – TitleFull: Comparison of parameter sensitivities between a laboratory and field-scale model of uranium transport in a dual domain, distributed rate reactive system. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Greskowiak, J. – PersonEntity: Name: NameFull: Prommer, H. – PersonEntity: Name: NameFull: Liu, C. – PersonEntity: Name: NameFull: Post, V. E. A. – PersonEntity: Name: NameFull: Ma, R. – PersonEntity: Name: NameFull: Zheng, C. – PersonEntity: Name: NameFull: Zachara, J. M. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: 2010 Type: published Y: 2010 Identifiers: – Type: issn-print Value: 00431397 Numbering: – Type: volume Value: 46 – Type: issue Value: 9 Titles: – TitleFull: Water Resources Research Type: main |
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