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The variety of landslide forms in Slovenia and its immediate NW surroundings

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Abstract

The Post-Forum Study Tour following the 4th World Landslide Forum 2017 in Ljubljana (Slovenia) focuses on the variety of landslide forms in Slovenia and its immediate NW surroundings, and the best-known examples of devastating landslides induced by rainfall or earthquakes. They differ in complexity of the both surrounding area and of the particular geological, structural and geotechnical features. Many of the landslides of the Study Tour are characterized by huge volumes and high velocity at the time of activation or development in the debris flow. In addition, to the damage to buildings, the lives of hundreds of people are also endangered; human casualties occur. On the first day, we will observe complex Pleistocene to recent landslides related to the Mesozoic carbonates thrust over folded and tectonically fractured Tertiary siliciclastic flysch in the Vipava Valley (SW Slovenia), serving as the main passage between the Friulian lowland and central Slovenia, and thus also an important corridor connecting Northern Italy to Central Europe. A combination of unfavourable geological conditions and intense short or prolonged rainfall periods leads to the formation of different types of complex landslides, from large-scale deep-seated rotational and translational slides to shallow landslides, slumps and sediment gravity flows in the form of debris or mudflows. The second day of the study tour will be held in the Soča River Valley located in NW Slovenia close to the border with Italy, where the most catastrophic Stože landslide in Slovenia recently caused the deaths of seven people, and the nearby Strug landslide, which is a combination of rockfall, landslide and debris flow. The final day of the Post-Forum Study Tour will start in the Valcanale Valley located across the border between Slovenia and Italy, severely affected by a debris flow in August 2003. The flow caused the deaths of two people, damaged 260 buildings; large amounts of deposits blocked the A23 Highway, covering both lanes. In Carinthia (Austria), about 25 km west of Villach, the Dobrač/Dobratsch multiple scarps of prehistoric and historic rockslides will be observed. Dobratsch is a massive mountain ridge with a length of 17 km and a width of 6 km, characterized by steep rocky walls. The 3-day study tour will conclude with a presentation of the Potoška planina landslide, a slide whose lower part may eventually generate a debris flow and therefore represents a hazard for the inhabitants and for the infrastructure within or near the village of Koroška Bela.

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Acknowledgments

The authors would like to thank the Slovenian Research Agency, the Ministry of the Environment and Spatial Planning, the Administration for Civil Protection and Disaster Relief, the University of Ljubljana, the Geological Survey of Slovenia and others not directly mentioned in the paper for the support in the form of funding, co-funding and important data.

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Authors and Affiliations

  1. Geological Survey of Slovenia, Dimičeva ul. 14, 1000, Ljubljana, Slovenia

    Mateja Jemec Auflič & Jernej Jež

  2. Department of Geology, Faculty of Natural Sciences and Engineering, University of Ljubljana, Ljubljana, Slovenia

    Tomislav Popit & Timotej Verbovšek

  3. Research Centre of the Slovenian Academy of Science and Arts, Novi trg 2, Ljubljana, Slovenia

    Adrijan Košir

  4. Faculty of Civil and Geodetic Engineering, University of Ljubljana, Ljubljana, Slovenia

    Matej Maček, Janko Logar, Ana Petkovšek & Matjaž Mikoš

  5. Department of Mathematics and Geosciences, University of Trieste, Trieste, Italy

    Chiara Calligaris, Chiara Boccali & Luca Zini

  6. Geological Survey of Austria, Neulinggasse 38, 1030, Vienna, Austria

    Jürgen M. Reitner

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  1. Mateja Jemec Auflič
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  2. Jernej Jež
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  8. Matjaž Mikoš
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  13. Timotej Verbovšek
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Correspondence to Mateja Jemec Auflič.

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Jemec Auflič, M., Jež, J., Popit, T. et al. The variety of landslide forms in Slovenia and its immediate NW surroundings. Landslides 14, 1537–1546 (2017). https://doi.org/10.1007/s10346-017-0848-1

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  • DOI: https://doi.org/10.1007/s10346-017-0848-1

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