The water quality in pristine aquifers is the result of complicated interactions between the solid phase and water flowing through the rock. To enhance the understanding of the processes involved and their interactions, reactive transport modelling will be carried out along selected flowlines.
The geochemical data (organic and inorganic) will be modelled using the state-of-the-art PHREEQC code taking into account the hydrogeology, groundwater residence time and mineralogy of the aquifer. This will provide a quantitative understanding of the main controls on baseline chemistry. Apart from providing an understanding of the evolution of water quality back in time (Figure 1), such models will also enable us to predict changes in water quality in the future.