Show simple item record

dc.contributor.authorvan der Weerd H
dc.contributor.authorHassanizadeh SM
dc.contributor.authorRichardson-van der Poel MA
dc.date.accessioned2014-01-17T14:06:41
dc.date.issued1993-01-31
dc.identifier725206010
dc.description.abstractA study of uranium transport in the Koongarra site of Alligator Rivers Uranium deposit (Australia) is carried out. The analysis of the solid phase uranium concentration measured at various depths provides a useful picture of the dispersion process. Results of this analysis seem to support the hypothesis that groundwater movement and dispersion of uranium has mainly taken place in the transition zone of weathering. As the rock has become fully weathered and turned into clayey material, the groundwater movement and uranium dispersion has basically stopped. From the dispersion patterns it can be concluded that either the direction of groundwater flow did not change significantly during the past few million years, or other environmental factors played a more important role. Comparing uranium solid phase and solution data, there appears to be a linear relationship between uranium in the accessible solid and the liquid phase. This suggest that it might be a good assumption to use the distribution coefficient between these phases, Pa, to include sorption in modelling. In the preliminary step of modelling, a mean flow velocity vector, constant in time and space has been used to simulate the dispersion fan. The movement of the weathering transition zone has been neglected. The calculated contour lines seem to be in qualitative agreement with the measured ones. Study of Koongarra site will assist to identify various processes which affect dispersion of radionuclides over long periods of time. Insight will be obtained into the ways of including complicated geochemical processes in a simplified manner in a transport model. Simulation of the dispersion fan measured at various depths in Koongarra with Metropol-4 will increase the model confidence.<br>
dc.description.sponsorshipDGM/SVS
dc.description.sponsorshipEZ
dc.format.extent48 p
dc.language.isoen
dc.publisherRijksinstituut voor Volksgezondheid en Milieu RIVM
dc.relation.ispartofRIVM Rapport 725206010
dc.relation.urlhttp://www.rivm.nl/bibliotheek/rapporten/725206010.html
dc.subject05nl
dc.subjectgrondwaternl
dc.subjectstromingnl
dc.subjecttransportnl
dc.subjectradioactief afvalnl
dc.subjectzoutlaagnl
dc.subjectopslagnl
dc.subjectondergrondse opslagnl
dc.subjectwiskundig modelnl
dc.subjectrisiconl
dc.subjectsimulatienl
dc.subjecturaniumnl
dc.subjectaustralienl
dc.subjectsorptienl
dc.subjectdispersienl
dc.subjectgroundwateren
dc.subjectflowen
dc.subjecttransport processesen
dc.subjectnuclear wasteen
dc.subjectsalt domesen
dc.subjectdisposalen
dc.subjectunderground storageen
dc.subjectmodellingen
dc.subjectrisksen
dc.subjectsimulationen
dc.subjectgeohydrologyen
dc.subjecturaniumen
dc.subjectaustraliaen
dc.subjectsorptionen
dc.subjectdispersionen
dc.subjectadsorptionen
dc.subjectweatheringen
dc.subjectverspreidingen
dc.subjectadsorptieen
dc.subjectverweringen
dc.subjectkoongarraen
dc.titleINTRAVAL phase 2, test case 8. Alligator Rivers Natural Analogue - Modelling of uranium transport in the weathered zone at Koongarra (Australia). Progress reporten
dc.title.alternative[INTRAVAL fase 2, test case 8. Alligator Rivers Natuurlijk Analogon - Modellering van uraniumtransport in de verweerde zone in Koongarra Australie). Voortgangsrapport.]nl
dc.typeReport
dc.contributor.departmentLBG
dc.date.updated2014-01-17T13:09:00Z
html.description.abstractA study of uranium transport in the Koongarra site of Alligator Rivers Uranium deposit (Australia) is carried out. The analysis of the solid phase uranium concentration measured at various depths provides a useful picture of the dispersion process. Results of this analysis seem to support the hypothesis that groundwater movement and dispersion of uranium has mainly taken place in the transition zone of weathering. As the rock has become fully weathered and turned into clayey material, the groundwater movement and uranium dispersion has basically stopped. From the dispersion patterns it can be concluded that either the direction of groundwater flow did not change significantly during the past few million years, or other environmental factors played a more important role. Comparing uranium solid phase and solution data, there appears to be a linear relationship between uranium in the accessible solid and the liquid phase. This suggest that it might be a good assumption to use the distribution coefficient between these phases, Pa, to include sorption in modelling. In the preliminary step of modelling, a mean flow velocity vector, constant in time and space has been used to simulate the dispersion fan. The movement of the weathering transition zone has been neglected. The calculated contour lines seem to be in qualitative agreement with the measured ones. Study of Koongarra site will assist to identify various processes which affect dispersion of radionuclides over long periods of time. Insight will be obtained into the ways of including complicated geochemical processes in a simplified manner in a transport model. Simulation of the dispersion fan measured at various depths in Koongarra with Metropol-4 will increase the model confidence.&lt;br&gt;


This item appears in the following Collection(s)

Show simple item record