| Abstract [eng] |
Final master's thesis “Mineral water formation of Šventoji - Upninkai aquifer complex in Western Lithuania“ is written by Elvinas Paplauskas. The work is relevant because it examines the hydrogeological and mineral water formation conditions of the Šventoji - Upninkai aquifer complex in Western Lithuania. Two wells have been installed in this layer over the last decade to extract mineralized water for health treatments. In addition, business and tourism interest in this work profile is rapidly growing. At the beginning of the final work, the literature of Lithuanian and foreign authors, scientific publications, related to the topic of the work, were reviewed, hydrogeological and hydrogeodynamic theoretical laws of water formation were described. Next, the characteristics of the research area were described: boundaries of the area, geographical conditions, hydrogeological-geological research and conditions, groundwater exploitation. The methodological part of the work defines how mineral water well was installed in this aquifer layer, how information was collected and processed, geological - hydrogeological conditions and compilation of cross-section were characterized. At the beginning of the work, three hydrogeological sections were drawn using ZWCAD software: sections that cross the research area from north to south, from west to east and crossing of the detailed hydrogeological section of Palanga city to the Silurian period rocks. Chemical analysis and hydrogeodynamic data were collected and selected from the geological survey GEOLIS information system, fieldwork records, Lithuania Geological Survey and company „Artva” archives. In order to access water origin and formation conditions the data were processed, calculations were performed - the degree of water metomorphization was obtained based on the Regional hydrochemical classification of Groundwater of the Baltic artesian basin, water type was determined according to V. Sulinas groundwater hydrochemical classification, comparative indicators of infiltrogenic and sedimentogenic brines were determined and forced pressure calculations were performed. The results show that most of the analysed mineral water in the wells is sedimentogenic brine, highly mineralized and is typical for the zone of slowed metabolism. Hydrochemical horizontal and vertical zonation is apparent in investigated aquifers in Western part of Lithuania. This information is presented graphically with the MAPinfo software - a map was created which distinguishes groundwater hydrochemical zones, with supplementary aquifer ridge isohypses and forced pressure isolines. A 3D model of a complex ridge absolute height was also developed. To sum up, the performed analysis revealed that the Šventoji - Upninkai aquifer complex is deepening in the southwest direction, mineralization from freshwater to brine is increasing in the same direction, and the overflow of groundwater from the higher an lower aquifers does not take place. The aqueous complex can be divided into two parts: the lower and upper part which has different water mineralization and hydrogeodynamic conditions. The paleohydrogeological development of the region changed original composition of groundwater, but comparative indexes show, that it retained features of sedimentogenic brines. |
