Landslide hazard zonation by deterministic analysis (Veľká Čausa landslide area, Slovakia) |
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| Authors: | Róbert Jelínek Peter Wagner |
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| Institution: | (1) State Geological Institute of Dionyz Stur, Kynceľovská 10, 974 01 Banská Bystrica, Slovakia;(2) State Geological Institute of Dionyz Stur, Mlynská dolina 1, 817 04 Bratislava 11, Slovakia |
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| Abstract: | A practical application of a simple and economical solution to landslide hazard zonation based on slope stability analysis
was carried out in the Veľká Čausa landslide, Horná Nitra region, central Slovakia. The region is prone to different types
of slope deformation controlled by geological structure, physical and mechanical properties of materials, complicated hydrogeological
setting, undulating morphology, and man-made influence. Taking into consideration the cause of the landslide, identified as
groundwater change, two scenarios of landslide activity have been investigated. Scenario 1 considers the maximum groundwater
level recorded from March 1995 to October 1998, corresponding to the period starting from the most recent landslide activity
up to the end of remediation work. Scenario 2 considers the maximum groundwater level recorded from November 1998 to December
2004, after the remediation works, and corresponding to the actual situation of the landslide. It has been found from this
study that slope angle has the highest influence on landslide instability in the Veľká Čausa landslide. Therefore, high resolution
Digital Elevation Model (DEM) is essential for obtaining reasonable results. In addition, an appropriate selection of the
model input parameters (e.g., shear strength) is very important. The validation between the calculated landslide hazard zonation
map and results of monitoring survey were examined. The results show moderate to good agreement with the inclinometric and
geodetic measurements. It was also verified that the most active part of the landslide is the north-western side. |
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| Keywords: | Landslide hazard zonation Slope stability GIS Slovakia Veľ ká Č ausa landslide |
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