Sunday, 30 June 2013

Derivation of flow and transport parameters from outcropping sediments of the Neogene aquifer, Belgium 30.6.13

Abstract
Centimetre-scale saturated hydraulic conductivities (K) are derived from air permeability measurements on a selection of outcrops of the Neogene aquifer in the Campine area, Belgium. Outcrop sediments are of Miocene to Quaternary age and have a marine to continental origin. Grain size analyses for the same outcrops and corresponding K predictions using previously developed models are also presented. We discuss outcrop hydrogeological properties and quantify the heterogeneity within the outcrops in detail using geostatistical variography. Moreover, outcrop-scale K values, their anisotropy and dispersivities are numerically calculated as a means to upscale such small-scale measurements to a larger scale commensurate with the scale of flow and transport modelling. By studying the small-scale variability as observed in outcrops, we gain crucial understanding of the larger-scale behaviour of the corresponding hydrogeological units within the Neogene aquifer, the most important groundwater reservoir of Flanders. The results of this study will equally improve conceptual hydrogeological model building and parameterization.

Keywords
Air permeameter; grain size; spatial variability; upscaling; anisotropy; dispersivity

Reference
Rogiers B, Beerten K, Smeekens T, Mallants D, Gedeon M, Huysmans M, Batelaan O, Dassargues A. 2013. Derivation of flow and transport parameters from outcropping sediments of the Neogene aquifer, Belgium. Geologica Belgica 16(3): 129-147. Paper (OA)



Below, an overview of the particle tracking performed for this paper is shown. The animations are made using the code from a previous blog post. The approximate extent of the outcrops that is simulated is shown as well in a photograph.

Campine Clay-Sand Complex (100 x 80 cm)


Lommel Sands (200 x 60 cm)




Mol Sands (160 x 80 cm)


Poederlee Sands (40 x 420 cm)


Poederlee Sands (40 x 100 cm)


Poederlee Sands (100 x 130 cm)


Poederlee-Kasterlee stratigraphic boundary (60 x 150 cm)


Kasterlee Sands (160 x 80 cm)


Kasterlee Clay (1600 x 200 cm)




Diest Clayey Top (40 x 120 cm)


Diest Sands (80 x 60 cm)


Bolderberg Sands (100 x 80 cm)


Bolderberg Sands (80 x 80 cm)

5 Bart Rogiers: Derivation of flow and transport parameters from outcropping sediments of the Neogene aquifer, Belgium Abstract Centimetre-scale saturated hydraulic conductivities ( K ) are derived from air permeability measurements on a selection of outcro...

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