-
oa Natural and man-induced landslides formation factors within the Tysa-Apshytsia interfluve (Transcarpathia, Ukraine)
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Second EAGE Workshop on Assessment of Landslide Hazards and impact on communities, Sep 2020, Volume 2020, p.1 - 6
Abstract
Landslides as one of the hazardous exogenous geological processes are typical for the Transcarpathia and have already been established on 3% of its territory, which is 9 times higher than the national average. The number of active landslides changes from year to year, their area annually covers 0.0614–0.2400 sq. km. The Tys-Apshytsia interfluve, located in the southeast of the Transcarpathia, is characterized by low-mountain relief and tectonically belongs to the Solotvynska depression. Fifteen ancient landslides with a total area of 0.45 sq. km have been mapped here. Since the 2000s, four newly formed landslides of Quaternary clays and loams, and six areas of ancient landslides activation have been surveyed within the area. Geological and geomorphological structure peculiarities of the study area (predominant distribution of clay rocks, their slope-conformable bedding, presence of weakened zones along tectonic faults, etc.), combined with unfavorable meteorological conditions, have caused a landslides activation. Landslides are usually small in size (ranging from 200 sq. m to 0.03 sq. km) and depth of emplacement (from 0.5 to 3.2 m, less often up to 5.0 m). The aim of the work is to assess the triggers of landslide formation, the influence of anthropogenic factor to mitigate the impact of landslide formation on human activity. For this reason, the case study of two sites (Bila Tserkva-Velykyi Bychkiv and Solotvyno) of landslides distribution was carried out with the identification of the landslide mechanism and triggering factors; for delineation of mass-movement area, the slope stability analysis using a finite-element method (the Mohr-Coulomb model in PLAXIS) for Solotvyno case were applied. The results show that landsides activisation in case study sites is strongly influenced by man-induced factors, such as, slope cuttings, mistakes in landslide protection (Bila Tserkva-Velykyi Bychkiv case) and the jointed effect of karstification, mining and other economic activity (Solotvyno case).
