Abstract
Titration of isotopic and geochemical ratios in karst water of the Jura Mountains shows gradients at the groundwater province scale. Climatic gradients are displayed under consideration of the emergence water temperature and its 18O content (0.22 δ ‰ per 100m). Geochemical gradients are connected to the intake area lithology (limestones, marls dolomites) but are also influenced by pollution. Gradients connected to the hydrodynamics of this area (ionic activity, silica tritium) oppose quick transit to long stay aquifers. Further they copy closely the geological structure (folded area with a high structural gradient and table-land with a weak incline).
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