engleski

Quaternary Deposits as the Hydrogeological System of Eastern Slavonia

The area of eastern Slavonia, situated between the Drava and Sava rivers, comprises three geotectonic units: the eastern part of sthe Drava depression in the north, part of the Slavonia-Srijem depressionin the south and the central Đakovo-Vinkovce plateau together with the Vukovar plateau. These units are separated by deep faults that reach the base of the Tertiary sediments. The first 200 m of Quaternary deposists are saturated with fresh water. The aim of this study was to find out whether the faults from impermeable boundaries separating the waterbearing deposits into independant hydraulic systems, or if a singular hydraulc entity exists. Results of the analysis indicate that lithological continuity of the aquifers exists along the fault zones on the margins of the Đakovo-Vinkovci and the Vukovar plateaux, which means that there is no impermeable hydraulic boundary on the watershed between the Sava and Drava rivers is one hydraulic system consisting of zones with different transmissivity values. In the zones of reduced transmissivity, the hydraulic connections are weakened, but not broken. Such zones exists not only along the fault zones of the Đakovo-Vinkovci plateau and the Vukovar plateau, but also within the Sava and Drava depressions. The terrain morphology influenced formation of both the surface and the underground watershed, parallel to the extension of the Đakovo-Vinkovci and Vukovar plateau. Therefore, within this single hydraulic entity, when the drawdown reaches the watershed due to excessive pumping, the watershed will be diplaced from its natural position.

Fault zones; Transmissivity; Plateau; Eastern Slavonia; Croatia

nije evidentirano