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Drip rate and tritium activity in the Niedźwiedzia Cave system (Poland) as a tool for tracking water circulation paths and time in karstic systems

Gąsiorowski M., Hercman H., Pruszczyńska A., Błaszczyk M.

Geochronometria

2015

Vol. 42, no.1

210--216

The Niedźwiedzia Cave system is composed of 3 horizontal levels of passages and chambers. Changes in the drip rate of water from the upper level stalactites correlate well with changes in precipitation intensity. The transition time between the surface and the upper level of the cave was estimated to 14 days. Drip sites in the middle and lower levels of the cave exhibited two types of recharge: some did not correlate with precipitation intensity, whereas others correlated well with rain events. The transition times for the latter sites were estimated to be greater than 6 months. This estimate was confirmed by the calculation of the transition time based on tritium activity. The oldest water in the entire karst system was observed in a karst spring. The mean tritium age for this water during winter was estimated to be 3.9 ± 0.6 yr. More precise calculations of the tritium age of karst water require longer precipitation activity datasets.