caa a22 4500 445814799 CHVBK 20180317145223.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s10040-011-0759-5 doi (NATIONALLICENCE)springer-10.1007/s10040-011-0759-5 Effects of tectonic structures, salt solution mining, and density-driven groundwater hydraulics on evaporite dissolution (Switzerland) [Elektronische Daten] [Eric Zechner, Markus Konz, Anis Younes, Peter Huggenberger] Effets des structures tectoniques, cavitation par solution salée et hydraulique gravitaire de nappe sur la dissolution d'évaporite (Suisse) Subsurface dissolution (subrosion) of evaporites such as halite and gypsum can lead to extensive land subsidence. Recent land subsidences have been surveyed at six separate locations in northwestern Switzerland. The diameters of the affected surface areas range from 100 to 1,500 m, and corresponding subsidence rates reached more than 100 mm/year. Based on a geometrical model, three sites could be outlined where land subsidence can likely be attributed to salt solution mining. The effects of increased hydrostatic gradient due to both groundwater withdrawal and fluid density contrasts were evaluated in more detail for the remaining sites with a series of 2D density-coupled solute-transport simulations along an approximately 1,000-m-long and 150-m-deep 2D cross section. Simulation results indicate that the upconing process of saline groundwater into the main aquifer occurs under different distributions of subsurface parameters and hydraulic boundary conditions. For the presented setup, the simulations also revealed that the most sensitive factor for the dissolution rate is the structure or dip of the halite formation, which leads to an increase of dissolution rate with increasing dip. Due to the increased density of the brine, an intrinsic flow dynamic develops which follows the direction of the dip. Springer-Verlag, 2011 Subrosion nationallicence Tectonics nationallicence Numerical modeling nationallicence Density-driven solute transport nationallicence Switzerland nationallicence Zechner Eric Institute of Geology and Paleontology, Environmental Sciences Department, University of Basel, Bernoullistr. 32, 4056, Basel, Switzerland aut Konz Markus Institute of Geology and Paleontology, Environmental Sciences Department, University of Basel, Bernoullistr. 32, 4056, Basel, Switzerland aut Younes Anis Laboratoire d'Hydrologie et de Géochimie de Strasbourg, University of Strasbourg, CNRS, UMR 7517, Strasbourg, France aut Huggenberger Peter Institute of Geology and Paleontology, Environmental Sciences Department, University of Basel, Bernoullistr. 32, 4056, Basel, Switzerland aut Hydrogeology Journal Springer-Verlag 19/7(2011-11-01), 1323-1334 1431-2174 19:7<1323 2011 19 10040 https://doi.org/10.1007/s10040-011-0759-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10040-011-0759-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zechner Eric Institute of Geology and Paleontology, Environmental Sciences Department, University of Basel, Bernoullistr. 32, 4056, Basel, Switzerland aut NATIONALLICENCE 700 1- Konz Markus Institute of Geology and Paleontology, Environmental Sciences Department, University of Basel, Bernoullistr. 32, 4056, Basel, Switzerland aut NATIONALLICENCE 700 1- Younes Anis Laboratoire d'Hydrologie et de Géochimie de Strasbourg, University of Strasbourg, CNRS, UMR 7517, Strasbourg, France aut NATIONALLICENCE 700 1- Huggenberger Peter Institute of Geology and Paleontology, Environmental Sciences Department, University of Basel, Bernoullistr. 32, 4056, Basel, Switzerland aut NATIONALLICENCE 773 0- Hydrogeology Journal Springer-Verlag 19/7(2011-11-01), 1323-1334 1431-2174 19:7<1323 2011 19 10040 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer