Reference : Groundwater model parameter identification using a combination of cone-penetration tests...
Scientific congresses and symposiums : Paper published in a book
Engineering, computing & technology : Geological, petroleum & mining engineering
http://hdl.handle.net/2268/59959
Groundwater model parameter identification using a combination of cone-penetration tests and borehole data
English
Rogiers, Bart [Belgian Nuclear Research Centre > Performance Assessment Studies > > >]
Schiltz, Marco [Samsuffit Geoservices > > > >]
Beerten, Koen [Belgian Nuclear Research Centre > Performance Assessment Studies > > >]
Gedeon, Matej [Belgian Nuclear Research Centre > Performance Assessment Studies > > >]
Mallants, Dirk [Belgian Nuclear Research Centre > Performance Assessment Studies > > >]
Batelaan, Okke [Katholieke Universiteit Leuven - KUL > Dept. of Earth and Environmental Sciences > Hydrogeology > >]
Dassargues, Alain mailto [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Hydrogéologie & Géologie de l'environnement >]
Huysmans, Marijke [Katholieke Universiteit Leuven - KUL > Dept. of Earth and Environmental Sciences > Hydrogeology > >]
Sep-2010
International Groundwater Symposium 2010, IAHR
paper 28, 1-19
No
International
International Groundwater Symposium 2010
september 2010
IAHR
Valencia
Spain
[en] geostatistics ; hydrogeology ; radioactive waste disposal ; groundwater modelling ; parameterisation ; scale ; CPT ; secondary data
[en] In the framework of the disposal of short-lived low- and intermediate-level radioactive waste in a
near-surface disposal facility in Dessel, Belgium, additional extensive site characterisation has been performed in 2008. The gathered data now include 388 hydraulic conductivity measurements on samples from 8 cored boreholes. Detailed characterisation of these cored boreholes, together with geophysical logging, enabled to identify various hydrostratigraphical units at 8 discrete locations in the research area. Various analyses were performed on the cores, yielding information on grain size, mineralogy, density and total porosity. Geophysical logging parameters were derived from gamma-ray and resistivity measurements. Subsequently, an extensive geotechnical logging campaign was performed in order to establish a 3D-model of the hydrostratigraphical units, based on a dense network of investigation points. About 180 cone penetration tests (CPTs) were executed and lithology was deduced in detail based on existing soil classi cation charts. As such, a description of the regional subsurface up to depths of nearly 50 m was established, and this information was integrated with the borehole data. Most importantly, the lateral extent, depth and thickness of a hydrogeologically important aquitard was identi fied.
Based on the 2008 site characterisation results and their interpretation, an update of a ground-
water fl ow model used in safety assessments was made. The CPT-based stratigraphic model and
the hydraulic conductivity data determined at different scales were combined into a new 3D hydrostratigraphical model. The small-scale measurements (on 100 cm³ core samples) are compared with hydraulic conductivity values obtained from pumping tests and the large-scale parameters derived by inverse modelling. The performance of the original and the updated flow model are compared. The presented approach was succesfull in substantially decreasing the conceptual model and parameter uncertainty and resulted in an improved calibration of the groundwater flow model.
Aquapôle - AQUAPOLE
CEN-SCK
Researchers ; Professionals
http://hdl.handle.net/2268/59959

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