Implications for karst hydrology from 3D geological modeling using the aquifer base gradient approach

Butscher, Christoph and Huggenberger, Peter. (2007) Implications for karst hydrology from 3D geological modeling using the aquifer base gradient approach. Journal of hydrology, Vol. 342, H. 1/2. pp. 184-198.

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Official URL: http://edoc.unibas.ch/dok/A4998995

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We use the gradient of the aquifer base to investigate the hydrology of mature, shallow karst systems. We first present a 3D geological model of the Gempen plateau (NW Switzerland) that reveals the geometry of aquifers and aquitards and their displacement at faults, then transfer the 3D geological model to a hydrological model. The transformation is based on a conceptual karst model. approximating subsurface flow in mature, shallow karst systems to open surface flow on the top of the uppermost aquitard or aquifer base. The gradient of this surface is expected to mainly influence regional groundwater flow patterns. We use the hydrotogical model. to delineate spring catchment areas. The discharge areas and corresponding catchment areas of the model are compared with the occurrence of springs in the study area and with hydraulic links confirmed by tracer tests. We also describe the way in which the hydrological model contributes to identifying flow processes. The proposed aquifer base gradient approach enhances vulnerability assessment in mature, shallow karst regions by (1) localizing catchment areas as a precondition of source protection strategies and (2) indicating dominant flow processes associated with individual springs. (c) 2007 Elsevier B.V. All rights reserved. Hydrogeologie der Nordwestschweiz, Grundwasser
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Ehemalige Einheiten Umweltwissenschaften > Applied Geology (Huggenberger)
UniBasel Contributors:Butscher, Christoph and Huggenberger, Peter
Item Type:Article, refereed
Article Subtype:Research Article
Note:Note: Zugleich als Sonderdruck erschienen -- Publication type according to Uni Basel Research Database: Journal article
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Last Modified:18 Dec 2015 09:32
Deposited On:22 Mar 2012 14:02

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