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Przydatność pomiarów georadarowych i analiz geomorfometrycznych do rozpoznania wewnętrznej struktury płytkich osuwisk : na przykładzie góry Średniak w Masywie Śnieżnika, Sudety Wschodnie

Makoś M., Sobczyk A.

Przegląd Geologiczny

2018

Vol. 66, nr 10

636--647

The paper reviews an application of non-destructive electromagnetic imaging of shallow bedrock and landslide colluvium horizons performed with ground-penetrating radar (GPR) technique on mass movement-affected mountain slope. We used a non-shielded 52 MHz GPR equipment to study an area of a shallow translational landslide, which developed on steeply inclined gneissic bedrock on Mt. Sredniak slopes (1210 m a.s.l.) in the Śnieżnik Massif. This landslide originated at the boundary zone between intact bedrock comprising Proterozoic gneisses and uppermost slope cover, as a result of continuous rainfall during July of 2011. Furthermore, to better understand and examine a landslide area on Mt. Sredniak slopes we also applied structural geological and geomorphological methods. The GPR analyses resulted in high-resolution imaging of internal slope structure and gravitational deposit architecture in the range of 0.5-5 m below surface level. Electromagnetic sounding performed directly above the landslide source area elucidated a set of bedrock discontinuities with a possible direct impact on water aggregation and migration during the rainfall episodes. Furthermore, a GPR profile performed in a landslide toe area, showed subsurface reflection horizons to be correlated with a colluvium/bedrock transitional zone and internal heterogeneous architecture of colluvial deposits. Ground-penetrating radar proved to be both powerful and an easy-maintained 'on-site' method for steep mountain slope analysis, with a potential for high-resolution imaging of shallow-seated gravitational slope deformations.

Thematic mapping of avalanche-threatened areas

Babiy L., Hrytskiv N., Laykun L.

Geomatics, Landmanagement and Landscape

2017

no. 4

15--26

Providing avalanche-threatened areas with modern thematic data mapping is an urgent task. It will allow us to predict and prevent catastrophic consequences of snow avalanches. The purpose of this paper is to create a set of thematic raster maps of Polonyna Borzhava mountain ridge, including a physical map, a map of relative avalanche hazards, and a map of avalanche paths, on the basis of analysing certain morphometric and environmental factors. Modelling and analysing morphometric parameters of the ridge surface were implemented, and they were represented as factors of avalanche occurrence. The areas with consistent snow avalanche occurrence in the Polonyna Borzhava mountain ridge were allocated by combining cartographic material, remote sensing data, statistical meteorological data and some geomorphometric data about the surface in one unified geographic information system. Thematic mapping of snow avalanches of Polonyna Borzhava ridge has been implemented in the scale of 1:50000. The resulting thematic maps can be used when developing winter tourist routes.