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Simulation of Rock Salt Dissolution and Its Impact on Land Subsidence : Volume 18, Issue 6 (17/06/2014)

By Zidane, A.

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Book Id: WPLBN0004011117
Format Type: PDF Article :
File Size: Pages 13
Reproduction Date: 2015

Title: Simulation of Rock Salt Dissolution and Its Impact on Land Subsidence : Volume 18, Issue 6 (17/06/2014)  
Author: Zidane, A.
Volume: Vol. 18, Issue 6
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Younes, A., Huggenberger, P., Zechner, E., & Zidane, A. (2014). Simulation of Rock Salt Dissolution and Its Impact on Land Subsidence : Volume 18, Issue 6 (17/06/2014). Retrieved from

Description: Applied and Environmental Geology, Environmental Sciences Department, University of Basel, Bernoullistrasse 32, 4056 Basel, Switzerland. Extensive land subsidence can occur due to subsurface dissolution of evaporites such as halite and gypsum. This paper explores techniques to simulate the salt dissolution forming an intrastratal karst, which is embedded in a sequence of carbonates, marls, anhydrite and gypsum. A numerical model is developed to simulate laminar flow in a subhorizontal void, which corresponds to an opening intrastratal karst. The numerical model is based on the laminar steady-state Stokes flow equation, and the advection dispersion transport equation coupled with the dissolution equation. The flow equation is solved using the nonconforming Crouzeix–Raviart (CR) finite element approximation for the Stokes equation. For the transport equation, a combination between discontinuous Galerkin method and multipoint flux approximation method is proposed. The numerical effect of the dissolution is considered by using a dynamic mesh variation that increases the size of the mesh based on the amount of dissolved salt. The numerical method is applied to a 2-D geological cross section representing a Horst and Graben structure in the Tabular Jura of northwestern Switzerland. The model simulates salt dissolution within the geological section and predicts the amount of vertical dissolution as an indicator of potential subsidence that could occur. Simulation results showed that the highest dissolution amount is observed near the normal fault zones, and, therefore, the highest subsidence rates are expected above normal fault zones.

Simulation of rock salt dissolution and its impact on land subsidence

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