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Groundwater model parameter identification using a combination of cone-penetration tests and borehole data
Rogiers, Bart; Schiltz, Marco; Beerten, Koen et al.
2010In International Groundwater Symposium 2010, IAHR
 

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Keywords :
geostatistics; hydrogeology; radioactive waste disposal; groundwater modelling; parameterisation; scale; CPT; secondary data
Abstract :
[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.
Research center :
Aquapôle - ULiège
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
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  ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Hydrogéologie & Géologie de l'environnement
Huysmans, Marijke;  Katholieke Universiteit Leuven - KUL > Dept. of Earth and Environmental Sciences > Hydrogeology
Language :
English
Title :
Groundwater model parameter identification using a combination of cone-penetration tests and borehole data
Publication date :
September 2010
Event name :
International Groundwater Symposium 2010
Event organizer :
IAHR
Event place :
Valencia, Spain
Event date :
september 2010
Audience :
International
Main work title :
International Groundwater Symposium 2010, IAHR
Pages :
paper 28, 1-19
Funders :
CEN-SCK
Available on ORBi :
since 01 June 2010

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