ZASTOSOWANIE MODELOWANIA GEOCHEMICZNEGO DO OCENY WARUNKÓW KSZTAŁTOWANIA SIĘ SKŁADU CHEMICZNEGO WÓD PODZIEMNYCH W REJONIE UJĘCIA GLIWICE ŁABĘDY
Abstract
APPLICATION OF GEOCHEMICAL MODELLING IN ASSESSING GROUNDWATER CHEMISTRY EVOLUTION
IN THE GLIWICE ŁABĘDY INTAKE AREA
Abstract. Paper presents results of spatial and temporal analysis of groundwater chemistry in Triassic fractured-karst-porous aquifer in the area of Gliwice Łabędy well field for the years 1995–2010. Outcome of geochemical modelling was also described as a tool for quantitative assessment of geochemical processes active in that part of the carbonate aquifer. Spatial heterogeneity of groundwater chemistry within the study area is manifested mainly by higher mineralization and concentrations of major ions west of the trough filled with Miocene evaporite deposits, what reflects significant impact of Miocene sediments on the groundwater chemistry. Major processes controlling chemical composition of groundwater within the study area are dissolution of carbonates and evaporites, sulfides oxidation and denitrification. Redox processes play an important role particularly in the agricultural area where elevated concentrations of nitrates where observed. Geochemical modelling with Phreeqc allowed the authors to distinguish sources of sulphates in groundwater (sulphides oxidation and gypsum dissolution) in different parts of the investigated aquifer.
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