engleski

The isotopic altitude effect of precipitation on the Northern Adriatic (Croatia)

The use and protection of the karst aquifers in the border area of Slovenia and Croatia require knowledge of the trans-boundary hydrological conditions. Three out of seven catchment areas between Kvarner and Trieste bay belong to trans-boundary aquifers. Rijeka, the third-largest city in Croatia, is located in this region. The precipitation as input into the water system and its stable isotope composition is a basic part whose knowledge is required for proper use and management of the water resources. The geomorphology of the region (e.g. mountains of 1400 m next to the sea) causes specific local conditions. We have measured the isotopic composition in various locations at different altitudes. For δ18O this ‘altitude effect’ is found to lie between approximately -0.14‰/100m and -0.3‰/100m, depending on the specific location and on the season. Correspondingly, also δD and the d-excess vary.

Karst aquifers; precipitation; stable isotope composition; altitude effect

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