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Content available Podatność osuwiskowa Polski
Using the location data of landslides and information on geo-environmental conditions, the landslide susceptibility in Poland was calculated using statistical methods. It shows that 15% of the country’s area is susceptible to landslides. The greatest threats occur in the Carpathians and in many regions of the Sudetes, uplands and in the riverbanks. The most vulnerable areas are the slopes in the range of 9-30°, which are built by the flysch sediments in the faulted zones. The areas susceptible to landslides include over a million buildings and about 7,000 km of roads.
The paper presents a statistical approach to landslide susceptibility modelling using the GIS-based spatial data analysis. The area of investigation is an urban district in which the activation of mass movements is of interest to both the local population and the authorities. The analyzes were carried out on the basis of the “Map of landslides and risk areas for the city of Gdansk” drawn in 2011. The research took into account the geological, geomorphological, hydrological, hydrogeological and anthropogenic conditions. Eleven landslide influencing factors were considered in the analyses. The landslide susceptibility map was evaluated by the landslides index method. The obtained results show that the most susceptible to landslides are slopes of angle between 10–29° and areas located at a distance of 50 m from watercourses and reservoirs. The presence of silty sands, silts and clays along a lithological layer and the N, NWand NE aspect of a slope are also of great significance. The final map presents the areas with the greatest probability of mass movement occurrence.
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