The paper summarizes the observation of the Potoška planina landslide, which is located in the Karavanke mountain range in NW Slovenia. This paper presents the monitoring of surface movement patterns at the toe of the Potoška planina landslide using two independent survey techniques. The sliding mass is composed of tectonically deformed and weathered Upper Carboniferous and Permian clastic rocks covered with a large amount of talus material, which is unstable and prone to landslides. Additionally, the Bela torrent causes significant erosion and increases the possibility of mobilization of the sliding mass downstream. In order to estimate surface movement patterns over a monitoring period of 22.5 months periodic monitoring was conducted using unmanned aerial vehicle (UAV)-based photogrammetry, which provides high-resolution images and tachymetric geodetic measurements that enables accurate control of photogrammetric analysis of surface displacements. According to our results, the movement pattern at the toe of the Potoška planina landslide indicates a steadily downslope movement of the entire area with localised surges superficial slips.
COBISS.SI-ID: 2566485
The landslide as a debris flow source identification is an important but often complex step in debris flow hazard assessment. Landslides are an important source of debris flows and this paper presents a multi-model approach of identification. The village of Koroška Bela in NW Slovenia has a history of debris flows and active landslides in the watershed of the Bela torrent, which presents a sediment source for potential debris flows in the future. Two models were applied for landslide identification in the watershed. A detailed field survey was carried out for model results validation. A GIS-based landslide susceptibility model was applied to identify areas susceptible to landslides and the LS Rapid triggering model was applied also to identify landslides and simulate the triggering phase.
COBISS.SI-ID: 2631765
In Slovenia and its immediate NW surroundings, a variety of landslide forms exist, presented in the 4th World Landslide Forum Post-Forum Study Tour. A fundamental common characteristic of landslides located in the Vipava River Valley and Soča River Valley (Slano blato, Rebrnice, Stogovce, Stože, Strug) is the high landslide velocity, due to heavy rainfall and soil wetting. These failures correspond to complex landslides, in which unstable masses develop into debris flow. In all cases, the sliding occurred in clastic rocks (mostly flysch) and located below steep slopes composed of highly permeable carbonate rocks. Due to faults and cracks in the surface rocks, a large part of precipitation is able to penetrate and supply the weathered clastic zones with additional water. In contrast, the geological complexity of each landslide area and surrounding caused the differences in movement types, sediment grain sizes and sliding surface. All these landslide forms can be placed in the category of rainfall-induced landslides that became active in unfavourable geological conditions. Similar unfavourable conditions also prevail at the Potoška planina landslide, where debris flow flooded the village of Koroška Bela in the eighteenth century. While active movements and geo-mechanical properties of the soils at Potoška planina indicate that the landslide material could generate a debris flow during heavy rainfall.
COBISS.SI-ID: 8095585