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Hydrogeological concept of the coastal karst spring Golubinka, a case study from the Dinaric karst, Croatia

The Golubinka spring is a typical coastal karst spring. It is situated in Northern Dalmatia, Croatia. The groundwater springs through the cave system, while most of the catchment area is built of karstified limestones. Geophysical research ; electrical tomography profiles have been done to improve understanding of the springs’ nearby outflow system. In the paper, these findings have been compared with hydrochemical circumstances and previous conceptual models, and they pointed out a few relevant facts. There are several karst conduit systems at the end of the catchment, connected or not with the previously explored cave systems. A conceptual model was improved based on the detailed hydrogeological map of the spring’s second sanitary protection zone and new findings obtained by electrical resistivity tomography. The research was conducted within the Interreg Adrion project MUHA (Multihazard framework for water-related risks management) because it was the project’s pilot area in Croatia. The explorations' main goal was to better understand hydrogeological circumstances in this very complex Dinaric karst system. The spring is coastal, and seawater penetration into its aquifer happens periodically. The spring is also a public water supply extraction site, and its protection significantly depends on the geological structure and rock mass karstification. MUHA project targets several types of hazards and risks that affect potable water resources and water-related issues (accidental pollution, flooding, drought, and failure of critical infrastructure due to earthquakes). Seawater influence on the Golubinka spring water is highly connected with drought events and pumping for water supply. These main hazards decrease groundwater pressure in the karst aquifer and allow seawater intrusions. Conceptual modeling and a better understanding of the spring’s nearby hinterland can lead to engineering solutions, such as corrections of the pumping regime and/or relocating the extraction site in the future.

karst spring, Golubinka, electrical resistivity tomography, hydrogeology

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