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Ziel 3/ Cíl 3 – Project ‘GRACE’ – a project aiming to clarify the phenomenon of declining groundwater levels in two Czech-Saxon boarder regions

Anna Katharina Böhm1, Frank Horna1, Mathias Hübschmann1, Ottomar Krentz1, Carsten Schulz1, Thomas Voigt2
1 LfULG
2 Friedrich-Schiller-Universität Jena

O 13.1 in Czech-German exchange on environmental-, soil- and hydro(geo)logical issues

30.05.2014, 11:00-11:20, H18, NW II

 

From 2011 till 2014 the Czech-Saxon project ‘GRACE’ (Groundwater Absence in Cretaceous Sandstone Aquifers) runs at the Saxon State Agency of Environment, Agriculture and Geology (LfULG). The project is funded by the European Regional Development Fund (ERDF). Objective of the project is to find the reasons for decreasing groundwater levels which have been observed in parts of the cretaceous sandstones in Czech and Saxony since the 1980 ties. The investigation areas are situated in the national park ‘Sächsische und Böhmische Schweiz’ and in the ‘Zittauer Gebirge’.

 

The main focus of the project lies on creating groundwater flow models in order to understand hydrogeological and hydrological processes and to predict future development of groundwater resources under changing conditions like climate change or human water supply. Therefor it was necessary to create models of geological and hydrogeological structures in Saxon parts of the investigation areas which are completely covered by cretaceous sandstones.

 

For the two geological models in both investigation areas all available boreholes and its information were used. A main emphasis lay on the correlation of Czech and Saxon sandstone layers in order to create a Saxon structure model which is compatible with already existing Czech geological models. Together with colleagues from the Czech Geological Survey and the Academy of Science a solution for correlation of Czech and Saxon cretaceous formations was found. Finally most of the Saxon boreholes were newly interpreted according to the new correlation and on the base of a partially new mapping of sandstones. Furthermore a correlation of the stratigraphic sandstone units in ‘Sächsische Schweiz’ and ‘Zittauer Gebirge’ was proposed for the first time.

 

In a second step the geological models were used to construct spatial models of hydrogeological structures by 3D-modeling using GEMCOM SURPACTM and Schlumberger Petrel. These models were constructed on a part of the Czech territory too allowing a more easily connection with the Czech data. The parameterisation of aquifers and aqiutards/ aquifuges by hydraulic parameters like permeability or porosity as well as the flow modelling itself was done by the Czech colleagues.

The results of flow modelling mainly improved the ideas of subsurface watersheds and showed the impacts of anthropogenous water withdrawals on both dynamic and static groundwater resources.



Voigt, T. et al. (2013): Grundlagen für ein geologisch-tektonisches Modell der Kreideablagerungen im Sächsisch-Böhmischen Grenzbereich im Rahmen des Ziel 3-Projektes GRACE. – Abschlussbericht, im Auftrag des LfULG, Friedrich-Schiller-Universität Jena; 42 S. + Anl.

Kahnt, R. et al. (2014): Entwicklung zweiter 3D-Modelle hydrogeologischer Körper im sächsisch-böhmischen Grenzgebiet im Rahmen des Ziel 3-Projektes GRACE. – Abschlussbericht, im Auftrag des LfULG, G.E.O.S. Ingenieurgesellschaft mbH; 115 S. + Anl.



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Letzte Änderung 14.05.2014