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Title: Exploratory and structural data analysis of a sandy aquifer at Mol/Dessel, Belgium
Authors: Rogiers, Bart
Mallants, Dirk
Batelaan, Okke
Gedeon, Matej
Huysmans, Marijke
Dassargues, Alain #
Issue Date: 3-May-2010
Host Document: Geophysical Research Abstracts vol:12
Conference: EGU General Assembly location:Vienna date:3-7 May 2010
Abstract: 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 characterization has been performed in 2008. The
gathered data now enclose 388 hydraulic conductivity measurements on samples of 8 cored boreholes. Additionally, secondary information as grain size analysis, resistivity, porosity, etc. was gathered. With this dataset,
a small-scale probabilistic approach can be used 1) to validate the current existing deterministic groundwater
models based on large-scale average hydraulic conductivity values, and 2) to support design for a monitoring
network. In preparation for stochastic realizations of the subsurface, an exploratory and structural data analysis
was performed and is presented here.
The exploratory data analysis allows definition of hydrogeological units, independent from the existing lithostratigraphy. It also shows the presence of three conductivity classes within a strongly heterogeneous unit.
Currently, only vertical structural data analysis is performed based on vertical data profiles. Semi-variograms
and cross-variograms are calculated to characterize the spatial variance of the different hydrogeological units.
Additional sampling and measurements will be performed in the future to provide information of the horizontal
spatial variance. Together with the current results, these will serve as the basis for conditional stochastic simulation
of groundwater flow and contaminant transport.
Publication status: published
KU Leuven publication type: IMa
Appears in Collections:Division of Geology
# (joint) last author

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