High-resolution reconstruction of three-dimensional sedimentary aquifer analog : the Herten case study
Abstract
Data di Pubblicazione:
2011
Citazione:
High-resolution reconstruction of three-dimensional sedimentary aquifer analog : the Herten case study / P. Bayer, A. Comunian, J. Straubhaar, P. Huggenberger, P. Renard. - In: GEOPHYSICAL RESEARCH ABSTRACTS. - ISSN 1607-7962. - 13:(2011). ((Intervento presentato al convegno EGU General Assembly tenutosi a Wien nel 2011.
Abstract:
In recent years, analog studies have contributed to an improved understanding of those geological structures that
control flow and transport in natural aquifers. Special attention has been drawn to unconsolidated sedimentary
deposits, which host many of the important shallow aquifers in Central Europe. Among these are relatively young
fluvio-glacial and fluvial sediments in the Rhine basin. Gravel pits found in excavation show excellent sections of
the sedimentary sequence and thus offer direct insight into the structural and textural composition of the subsoil. A
major problem is that usually analogs are obtained from single outcrop walls, which only deliver a cross-sectional
profile but hardly capture the true three-dimensional conditions. This study describes an approach to also examine
the third dimension: by mapping during the ongoing excavation it is possible to obtain a three-dimensional repre-
sentation of a local field of observation within a short period of time. A detailed description of this “Herten case”
is presented and the findings from sedimentological, hydrogeological and geophysical analyses are compared. A
medium-scale (16m x 7m x 10m) gravel body is studied that delivered a high-resolution data set of lithofacies,
hydrofacies and ground penetrating radar (GPR) profiles. The three-dimensional (3D) structure is reconstructed in
a hierarchical framework by multiple point geostatistics. The developed aquifer analog model reproduces realistic
geological structures, and it respects the vertical distribution of the proportions of the conditioning data. It can
serve as ideal research benchmark for a variety of applications in hydrology and hydrogeology.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
P. Bayer, A. Comunian, J. Straubhaar, P. Huggenberger, P. Renard
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