MOŻLIWOŚCI i OGRANICZENIA ZASTOSOWANIA SF6 DO OCENY CZASU PRZEBYWANIA WÓD W OŚRODKACH WĘGLANOWYCH NA PRZYKŁADZIE GZWP GLIWICE

Abstract

ADVANTAGES AND CONSTRAINTS OF GROUNDWATER DATING USING SF6 IN CARBONATE AQUIFERS ON THE EXAMPLE OF MGWB GLIWICEAbstract, One of the most important issues in groundwater modelling is a validation process based on a comprehensive study of groundwater flow system. Groundwater dating, using environmental tracers like SF6, is a valuable tool for model verification. The paper describes preliminary results of SF6, application in the recognition of the MGWB Gliwice groundwater system. The aquifer represents a highly complex, triple-porosity hydrogeologicai system. The research, based on groundwater and surface water sampling carried out in 2010, revealed a generally high concentration of sulphur hexafluoride in water, ranging from 0.29 to 6.17 fmolL -1. In order to assess apparent groundwater age, selected lumped parameter models were applied, with a dispersion model chosen to fit best to the aquifer under investigation. The calculated residence time of tracer in the groundwater system is notably low and ranges generally from 5 to about 35 years, which suggests relatively short groundwater residence time in the aquifer.