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Applied hydrogeology

The applied hydrogeological and hydrochemical research on the rock environment is focused on fractured hard rocks. These projects are concerned with identifying and evaluating sites with geological formations and structures suitable for use as underground repositories and reservoirs, including a deep geological repository for radioactive waste.

Water is the major medium in which contamination is transported from an underground storage back to the biosphere. Therefore, a determination of hydraulic properties of the rock and identification of preferred pathways for the flow of ground water are crucially important for a safety assessment of the underground repositories. Chemistry of the groundwater is equally important because this will govern the rate and type of chemical reactions between water, rock and geotechnical barriers.

Example of a comprehensive graphic interpretation of data from the borehole MEV-1 located at Melechov. The borehole was drilled as a part of the project MPO FR-Tl1/367.

Example of a comprehensive graphic interpretation of data from the borehole MEV-1 located at Melechov. The borehole was drilled as a part of the project MPO FR-Tl1/367.

Hydrogeological research carried out by the CGS in this area is designed to obtain and evaluate data from sites located in granitoid rocks. For this purpose, new methods were developed for making field measurements in rock environments with very low hydraulic conductivity. Special technical equipment was developed for hydrodynamic testing, and for collecting undisturbed samples of ground water from individual fractures or from fractures zones intersected by small diameter boreholes. This equipment has proved so effective that a submission has been made for a patent to be granted.

A field measurement of hydrogeological properties of rocks in a borehole at Tis u Blatna, West Bohemia.

A field measurement of hydrogeological properties of rocks in a borehole at Tis u Blatna, West Bohemia. (Author: Oldřich Myška)

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Česká geologická služba
Geologická 577/6
152 00 Praha 5
tel.: +420251085240
fax: +420 251 818 748
lenka.rukavickova@geologycz