20.500.12556/DiRROS-23480 Long-term post-event processes and major reactivation of a complex landslide: 2000–2023 evolution of the Ciprnik landslide, Julian Alps, Slovenia The Ciprnik complex landslide in the Planica valley (NW Slovenia) happened on 19. 11. 2000 as a translation slip-debris flow-hyperconcentrated flow event. It was triggered by a combination of the local geological structure (highly fractured beds dipping parallel to the surface), lithology (alternation of thin bedded carbonates and fine-grained clastics), and record-breaking monthly rainfall (613.6 mm in the month of the event). Twenty-three years later, on the night from 24. to 25. 10. 2023, large parts of the landslide reactivated during intense short-duration rainfall, which has a relatively common occurrence (104.2 mm in 24 h). We use 2006–2023 time series of photogrammetrically derived digital elevation models generated from aerial photographs and unmanned aerial vehicle surveys, sedimentological analysis, and meteorological data to (1) analyze decade-scale post-event processes on the Ciprnik landslide following the initial sliding event in November 2000 and (2) to study the October 2023 event and compare it to the November 2000 event. We find that after the initial November 2000 event, the area of the Ciprnik landslide remained unstable with an average annual erosion rate of 1000 to 3500 m3 of sediment. The 2023 event measured 26,000 m3 and, despite a different triggering rainfall, again occurred as a translation slip-debris flow-hyperconcentrated flow event exhibiting a strong fining down of sediment (from muddy-sandy-gravel to sandy-silt). This study demonstrates the complexity of triggering thresholds in the aftermath of the main mass movement event. Even in the later events, which have the same transport mechanisms as the original event, the triggering precipitation can differ considerably in duration and magnitude. complex landslide translational slip debris flow hyperconcentrated flow UAV granulometry true false true Angleški jezik Ni določen Neznano 2025-09-04 03:41:33 2025-09-04 13:41:17 2025-11-18 03:43:30 0000-00-00 00:00:00 2025 0 0 str. 4013-4027 12 22 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2025-08-08 55 1612-510X 10.1007/s10346-025-02598-5 246472963 s10346-025-02598-5-8.pdf s10346-025-02598-5-8.pdf 1 5DF36DE5BC589A6A00E8660040440C04 f9a73aa6b4b3a6d1280cb0540ca8bccda1b311747fdd4172952a4c7460801126 dfebe1b2-c3bc-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=35931 Geološki zavod Slovenije 0 0 0