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Influence of Carbonate-Flysch Contact and Groundwater Dynamics on the Occurrence of Geohazards in Istria, Croatia

Author

Listed:
  • Sanja Dugonjić Jovančević

    (Faculty of Civil Engineering, University of Rijeka, Rijeka 51000, Croatia)

  • Josip Rubinić

    (Faculty of Civil Engineering, University of Rijeka, Rijeka 51000, Croatia)

  • Igor Ružić

    (Faculty of Civil Engineering, University of Rijeka, Rijeka 51000, Croatia)

  • Maja Radišić

    (Faculty of Civil Engineering, University of Rijeka, Rijeka 51000, Croatia)

Abstract

This research focuses on the analysis of soil-water interaction at the carbonate-flysch contact on the Istrian peninsula in Croatia. As a result of the interaction of surface and groundwater and the position of flysch and carbonate rocks in the geotechnical profile, two problems occur in the study area: numerous instabilities and the occasionally high turbidity of drinking water. As an example, the St. Ivan spring was considered. The paper presents a complex mechanism of groundwater circulation in geological structures at carbonate-flysch contacts, differences in runoff through karst aquifers and flysch rocks during heavy rainfall under current and predicted (climate change) conditions, and the mentioned geohazards as a result of extreme precipitation. The analyses carried out showed the decisive influence of the existing geological structure on the dynamics of infiltration and precipitation runoff, as well as the risks of pronounced spring water turbidity and instability events. The main drivers of these geohazards are continuous long-term precipitation for landslides and intense daily precipitation for turbidity. Possible consequences of climate change are the increase in precipitation intensity, amount and higher variation, which subsequently brings risks such as the increase in maximum runoff, i.e., the expected more frequent occurrence of high turbidity and the more frequent occurrence of higher cumulative precipitation triggering instabilities in the area.

Suggested Citation

  • Sanja Dugonjić Jovančević & Josip Rubinić & Igor Ružić & Maja Radišić, 2021. "Influence of Carbonate-Flysch Contact and Groundwater Dynamics on the Occurrence of Geohazards in Istria, Croatia," Land, MDPI, vol. 10(5), pages 1-14, April.
    • Handle: RePEc:gam:jlands:v:10:y:2021:i:5:p:441-:d:540314
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    References listed on IDEAS

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    1. Sanja Dugonjić Jovančević & Željko Arbanas, 2017. "Influence of the runout potential on landslide-susceptible areas along the flysch–karst contact in Istria, Croatia," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 85(3), pages 1347-1362, February.
    2. Sanja Dugonjić Jovančević & Željko Arbanas, 2012. "Recent landslides on the Istrian Peninsula, Croatia," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 62(3), pages 1323-1338, July.
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    Cited by:

    1. Ozren Hasan & Slobodan Miko & Saša Mesić & Zoran Peh, 2023. "Chemical Weathering Rates of Soils Developed on Eocene Marls and Sandstones in a Mediterranean Catchment (Istria, Croatia)," Land, MDPI, vol. 12(4), pages 1-18, April.

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    1. Sanja Dugonjić Jovančević & Željko Arbanas, 2017. "Influence of the runout potential on landslide-susceptible areas along the flysch–karst contact in Istria, Croatia," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 85(3), pages 1347-1362, February.

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