The article presents the results of monitoring of landslides related to opencast mining. The landslides formed on the slopes of an artificial water reservoir in the Adamów open-cast lignite mine. The photogrammetric method was used for monitoring. The study of landslide activity was performed on the basis of six photogrammetric surveys made with the DJI Phantom 4 Advanced UAV. Changes in the landslide extent and vertical displacements were determined in five measurement periods. For four periods, differential digital terrain models were made and the volume of displaced earth masses was calculated. The future extent of the landslide was determined on the basis of cracks visible in high-resolution optical photos. The research has shown that UAVs equipped with an optical camera are very useful in monitoring the stability of slopes of post-mining water reservoirs. The applied method provided detailed data on the size of displacements without compromising on safety of people involved in field surveys.
The paper presents the history and latest achievements in landslide research at the Polish Geological Institute (PGI). Since the establishment of PGI in 1919, landslides have been investigated during geological mapping in the Carpathians and considered by engineering geologists. After the 2nd World War, the importance of landslide research becomes more and more important following each landslide catastrophic event. Since 2008, the research on landslide and mass movements has been carried out systematically at the PGI within the SOPO (Landslide Counteracting System) project framework. Since that time, the SOPO project has been developing from landslide mapping and recording into a large spatial database, a sophisticated monitoring system (including on-line data acquisition) and susceptibility analysis, and early warnings with prediction capabilities. SOPO plays an important role to local and national administration. Together with the legal component, it allows defining a strategy for landslide risk reduction in Poland. Recently, landslide research plays so important role at the PGI that a special department, called Geohazard Center, has been established within the PGI organizational structure.
Landslide monitoring is applied in case of a hazard for existing infrastructure located on hazardous landslide. It is the exact case of the Kasinka Mala landslide in the Outher Carpathians which causes a danger for the surrounding infrastructure. In order to measure the terrain deformations caused by landslide movements, the unnamed aerial vehicle equipped with a non-metric camera has been used. As a result of processing of aerial photos, orthophotomaps as well as digital elevation models have been produced. It enabled providing information about vertical and horizontal displacements caused by the landslide. The results of analysis shows that the mass movements occur at a different pace, but also that there are stable areas in the landslide. The application of UAV photogrammetry for landslide monitoring allows getting the information about the displacements in the unvegetated areas.
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