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Charles University in Prague (2017)

Salt precipitation in subsurface zone of sandstone and other porous rocks and simulation of water transport and evaporation

Sommerová Anna

Titre : Salt precipitation in subsurface zone of sandstone and other porous rocks and simulation of water transport and evaporation

Srážení solí v přípovrchové zóně pískovce a dalších porézních hornin a simulace transportu a výparu vody

Auteur : Sommerová Anna

Université de soutenance  : Charles University in Prague

Grade : Mgr Diploma thesis 2017

Résumé
The main goal of this thesis was to find and compare salt-forming ions from samples of a subsurface zone of sandstone and other porous rocks. The surveyed samples came from different environments (humid and arid climate) from different locations in the Czech Republic, Jordan and the United States of America. Identification of various types of salt was based on evaluation of chemical analyzes of leached samples. Furthermore a laboratory experiment in which I used a fluorescein dye to observe the capillary rise and evaporation in unsaturated samples of sandstone was carried out. The salt content in the Czech Republic humid environment locations is generally lower than the one in foreign arid climate locations. Halit dominates in the locations Petra and Crystal Peak. In the other locations sulphate minerals dominate. The salts containing aluminum – alums were determined in the Czech Republic in the area of Czech Paradise and the surrounding. Relatively high concentrations of nitrate mineral nitratine were identified in the Devil’s Pulpit location in Pilsen, the Czech Republic. From the observation of capillary rising experiments performed with artificially created honeycombs, I conclude that the height of the capillary rise is crucial for the transport of solution, and at a certain capillary height, the solution gets only into the backwalls of the honeycomb while the lips of honeycomb remain dry.

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Page publiée le 6 mai 2018