Présentations Colloques

    Poster
    8.08
    Session 8.08: Mineral and Thermal water: an indicator of deep processes and source of economically valuable minerals
    Stasko (orateur)
    Interaction between fresh and therapeutic groundwater in exploitation conditions based on one year H, O, and S isotope and chemical observations of selected wells (Carpathians, SW Poland)
    **Complicated terms of water circulation in the flysch mountain catchments make it necessary to search for effective methods of its analysis in exploitation conditions. The main goal of the study was understanding processes of interaction between medicinal (HCO3-Na type, mineral) and fresh groundwater in flysh aquifer on the basis of case in Tylicz region (Carpathians, SW Poland). Reliable approach for medicinal water protection is pivotal task which remains without answer in Polish and European regulations. **One year periodic observation of chemical and isotopic composition was carried out (with parallel water table monitoring) in two neighbouring wells (with fresh and therapeutic groundwater), surface water, precipitation and infiltration water. During the study period significant differences among composition of groundwater, surface water and potential groundwater recharge sources were observed. Based on chemical (Na+, K+, Mg2+, Ca2+, HCO3-, Cl-, SO42-) and isotopic research (+18O(H2O), +2H(H2O), +34S(SO42-), +18O(SO42-) and hydrodynamic data, it was found that studied fresh and mineral groundwater demonstrate different origins and circulation ways. Fresh groundwater resources probably integrally were formed in the catchment (modern infiltration origin) and from precipitation to drainage area was impacted only by local factors. Chemical and isotope composition of mineral groundwater indicated that its resources was formed in deeper part of aquifer us an effect of glacial infiltration origin. Additionally, during the observation period there were no evidences for mixing of these waters with fresh groundwater during their exploitation. **The study demonstrated the usefulness of systematic and continuous isotopic, especially +34S(SO42-) and +18O(SO42-), analysis as an important complement to other chemical, isotope and hydrodynamic studies. Due to sustainable fresh groundwater resources management it is recommended not use simplified rules and limited extraction in area of fresh and mineral water coexistence without isotopic, chemical and hydrodynamical analysis.****
    Poland

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