LiDAR-Based Identification, Mapping and Inventory of Slope Deformations in Biele Karpaty Mts.

Improving the landslide risk prevention by defining the risk of slope deformation in geological environment prone to mass movements within the Slovak Republic, is the primary objective of the geological task Identification, Inventory and Engineering Geological Mapping of Slope Deformations which was solved in 2018–2023. It concerns the exploration of 5 regions significantly threatened by slope failures with a total mapped area of approximately 3,195 square kilometres. One of these regions are Biele Karpaty Mts. with an area of 606.4 km ² . The inventory itself was preceded by the creation of a detailed digital terrain model (DTM) generated from airborne LiDAR data. Engineering geological and geological mapping was aimed at refining the position of the covering Quaternary lithological complexes and the slope deformations and other geohazards using precise DTM and GNSS technologies. This was followed by the updating the database of slope deformations operated by SGIDŠ and by the preparation and creation of parametric maps necessary for the development of the landslide hazard forecast by numerical methods in the GIS environment. In this paper we present results of the mapping and their comparison with existing Atlas of Slope Stability of the Slovak Republic.As a result of mapping in the region of the Biele Karpaty Mts., 2,951 landslides covering the total area 109.6 km ² were registered. A differentials map of landslide near Machnáč Hill was created by using interpolated LiDAR data comparison of the two differential digital terrain models (2018 vs 2021) via map algebra analysis.