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1 Studia Geomorphologica Carpatho-Balcanica

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Quantitative changes in near-channel landslides caused by fluvial erosion in the light of high-resolution DEM

Cebulski Jarosław

Studia Geomorphologica Carpatho-Balcanica

2022/2023

Vol. 56/57

3--50

The article deals the issue of near-channel landslide activity in two regions (Rożnowskie Foothills and Beskid Niski Mountains) in the Polish Outer Carpathians. The main objective of the research was to determine the volume of material removed from the studied landslides in the period from their occurrence to 2012 and to compare these results with the volume of material removed from landslides during the period of detailed research in 2014–2017. The ALS data was used to prepared to the DoDs analysis DoD analysis with theoretical landslide surfaces and to determine the volume of material removed from the occurrence of landslides to 2012. Detailed TLS surveys (10 measurement series) were carried out from April 2014 to November 2017, resulting in nine Digital Elevation Models (DEMs) of Difference (DoDs), illustrating quantitative and spatial changes within the investigated landslides. It was found that near-channel landslides, under the influence of ongoing fluvial erosion, exhibit continuous activity with varying intensity, depending on the hydrometeorological conditions. During flood events, the movements within the entire landslide area were activated. Conversely, in periods between floods, there was a constant removal of material from the toe of the landslides. During flood events, the material carried away by streams accounted for 60% to 90% of the volume of material removed throughout the research period. The volume of material removed from the landslide in 4 years of survey ranges from 14 to 107% of the material removed from the landslide since its occurrence to 2012.