20.500.12556/DiRROS-21834 Groundwater tracer tests as a supporting method for interpreting the complex hydrogeological environment of the Urbas landslide in NW Slovenia This study investigates groundwater flow patterns in a landslide area above the settlement of Koroška Bela in NW Slovenia using a series of tracer tests with sodium chloride (NaCl) and fluorescein (uranine). The tracer experiments, using a combination of pumping tests and continuous groundwater observations, reveal two distinct groundwater flow horizons within the landslide body: a prevailing shallower flow within highly permeable gravel layers and a slower deep flow in the weathered low-permeability clastic layers. Uranine injections suggest longer retentions, indicating complex hydrogeological conditions. Groundwater is recharged by the infiltration of precipitation and subsurface inflow from the upper-lying carbonate rocks. In the upper landslide, highly permeable gravel layers accelerate flow, especially during heavy rainfall, while downstream interactions between permeable gravel and less permeable clastic materials create local aquifers and springs. These groundwater dynamics significantly influence landslide stability, as rapid infiltration during intense precipitation events can lead to transient increases in pore water pressure, reducing shear strength and potentially triggering slope movement. Meanwhile, slow deep flows contribute to prolonged saturation of critical failure surfaces, which may weaken the landslide structure over time. The study emphasizes the region’s geological heterogeneity and landslide stability, providing valuable insights into the groundwater dynamics of this challenging environment. By integrating hydrogeological assessments with engineering measures, the study provides supportive information for mitigating landslide risks and improving groundwater management strategies. groundwater tracer landslide Carboniferous Permian clastic rocks true false true Angleški jezik Ni določen Neznano 2025-04-05 03:35:40 2025-04-08 13:09:56 2025-10-24 03:49:58 0000-00-00 00:00:00 2025 0 0 17 str. no. 5 vol. 15 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2025-03-03 556.3 2076-3417 10.3390/app15052707 228596227 applsci-15-02707-2.pdf applsci-15-02707-2.pdf 1 EB3793C20DD763D47E0D96C9D40859E1 99df02482aeb2e2ebe1ec98cb2e9f6803b5b763f5ecf9643a6da61f1adc8fbb6 544c225f-146a-11f0-963a-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=31554 Geološki zavod Slovenije 0 0 0