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On the effects of subsurface parameters on evaporite dissolution (Switzerland)

Zidane, A. and Zechner, E. and Huggenberger, P. and Younes, A.. (2014) On the effects of subsurface parameters on evaporite dissolution (Switzerland). Journal of contaminant hydrology, Vol. 160. pp. 42-52.

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Official URL: http://edoc.unibas.ch/dok/A6288891

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Abstract

Uncontrolled subsurface evaporite dissolution could lead to hazards such as land subsidence. Observed subsidences in a study area of Northwestern Switzerland were mainly due to subsurface dissolution (subrosion) of evaporites such as halite and gypsum. A set of 2D density driven flow simulations were evaluated along 1000 m long and 150 m deep 2D cross sections within the study area that is characterized by tectonic horst and graben structures. The simulations were conducted to study the effect of the different subsurface parameters that could affect the dissolution process. The heterogeneity of normal faults and its impact on the dissolution of evaporites is studied by considering several permeable faults that include non-permeable areas. The mixed finite element method (MFE) is used to solve the flow equation, coupled with the multipoint flux approximation (MPFA) and the discontinuous Galerkin method (DG) to solve the diffusion and the advection parts of the transport equation. Results show that the number of faults above the lower aquifer that contains the salt layer is considered as the most important factor that affects the dissolution compared to the other investigated parameters of thickness of the zone above the halite formation, a dynamic conductivity of the lower aquifer, and varying boundary conditions in the upper aquifer. (C) 2014 Elsevier B.V. All rights reserved.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geologie-Paläontologie > Applied Geology (Huggenberger)
UniBasel Contributors:Huggenberger, Peter and Zechner, Eric and Zidane, Ali
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Elsevier
ISSN:0169-7722
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:10 Oct 2014 09:19
Deposited On:10 Oct 2014 09:19

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