Reference : The usefulness of CPTs for deterministic, spatially heterogeneous, large-scale aquita...
Scientific congresses and symposiums : Paper published in a book
Engineering, computing & technology : Geological, petroleum & mining engineering
http://hdl.handle.net/2268/137362
The usefulness of CPTs for deterministic, spatially heterogeneous, large-scale aquitard parametrisation
English
Rogiers, Bart [Belgian Nuclear Research Centre (SCK•CEN) > Institute for Environment, Health and Safety > > >]
Mallants, Dirk [CSIRO Land and Water (Australia) > Groundwater Hydrology Program > > >]
Batelaan, Okke [Vrije Universiteit Brussel - VUB > Dept. of Hydrology and Hydraulic Engineering > > >]
Gedeon, Mattej [Belgian Nuclear Research Centre (SCK•CEN) > Institute for Environment, Health and Safety > > >]
Huysmans, Marijke [Katholieke Universiteit Leuven - KUL > Dept. of Earth and Environmental Sciences > > >]
Dassargues, Alain mailto [Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Hydrogéologie & Géologie de l'environnement >]
Dec-2012
Abstract available on IAHS website http://www.iahs.info/redbooks/355.htm
Models - Repositories of Knowledge
Oswald, S.E.
Kolditz, O.
Attinger, S.
IAHS
Publ. 355
41-47
Yes
International
9781907161346
Wallingford
UK
ModelCARE2011
18-22 september 2011
IAHS
Leipzig
Germany
[en] Groundwater modelling ; heterogeneity ; aquitard ; CPT ; hydraulic conductivity ; cone penetration tests ; inverse optimisation ; soil behaviour types ; upscaling ; geostatistics ; friction ratio ; cone resistance
[en] Aquitards can be effectively parameterised and incorporated in a groundwater flow model by using standard cone penetration tests (CPTs). Several conceptually different realizations of an aquitard’s hydraulic conductivity field were evaluated based on: (i) conventional methods of soil behaviour type classification, (ii) recent relationships from the literature, and (iii) novel site-specific relations with hydraulic conductivity. We show that use of most of these CPT-based hydraulic conductivity estimations in groundwater flow modelling effectively enhance model performance based on absolute head values and gradients across the aquitard. Conceptual models that considered a spatially heterogeneous hydraulic conductivity for the aquitard performed better than the reference case with a uniform aquitard hydraulic conductivity. However, the hydraulic conductivity of thin heavy clay lenses, characteristic of the aquitard present in our study area, cannot be captured using these continuum approaches. The
latter leads to a bias in the direct hydraulic conductivity predictions; an alternative is to invoke inverse modelling with the heterogeneous parameter fields. To address this issue, the concept of the boundary energy associated with the CPT signal is also introduced for characterising the presence of heavy clay lenses. Overall, the CPT-based concepts provide more accurate, robust, and high-resolution data-based parameterisation of the studied aquitard.
Aquapôle - AQUAPOLE
Researchers ; Professionals
http://hdl.handle.net/2268/137362

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