Dr. Plamen Ivanov Profile

Dr. Plamen Ivanov

at Geological Institute BAS

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Publications (2)

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Proceedings Article | 20 September 2020 Presentation + Paper

Studying the slope deformations in a Bulgarian mountain by multitemporal DInSAR data processing

Hristo Nikolov, Mila Atanasova, Plamen Ivanov, Boyko Berov

Proceedings Volume 11533, 1153319 (2020) https://doi.org/10.1117/12.2573945

KEYWORDS: Data processing, Synthetic aperture radar, Satellites, Data acquisition, Roads, Bridges, Stochastic processes, Geodesy, Laser scanners, Analytical research

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This research is focused on registering the movements along the slope of the several slopes located on south-west of the mountain Stara Planina and establishing their average annual values. Currently at national level there are a low number of studies targeted at operational monitoring of the investigated slopes. These objects are quite specific for research since those kind of natural phenomena are inaccessible by other means or are quite dangerous to be investigated. On the other hand, the moving slopes are causing damages to infrastructural objects such as roads, bridges or power lines. Their behavior is difficult to forecast and for this reason they can be considered as natural hazards. Obtaining precise data for the single slope movements is done by in-situ investigations such as geodetic acquisitions, terrestrial laser scanning, and geological observations, which all require financial resources and human effort. For this reason, we used remotely sensed data from satellite based SAR instruments processed using the DInSAR method in order to analyze the motions of single slope and to establish a technique for the investigation of mountain slopes. An advantage of the selected method is the possibility to register the vertical movements of the whole slope with centimeter accuracy. This approach is based on the free access to the SAR data and tools for their thematic processing provided by ESA. In this study an emphasis is put on the manner how the obstacles encountered during the interferometric processing (e.g. presence of vegetation or topography) have been overcome. From the downloaded set of SAR images covering the region created were two multitemporal InSAR data series from ascending and descending orbits of the satellite. The results from the autumn-winter pairs exhibited good correlation with the expected displacements along the studied slope having a magnitude of 0.8 m.

Proceedings Article | 26 August 2020 Paper

Study of the contemporary state of the landslides in the northern Bulgarian Black Sea coast

Hristo Nikolov, Mila Atanasova, Keranka Vassileva, Rosen Nankin, Plamen Ivanov, Nikolay Dimitrov

Proceedings Volume 11524, 115241C (2020) https://doi.org/10.1117/12.2570678

KEYWORDS: Satellites, Satellite imaging, Raster graphics

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The territorial distribution of landslides along the Northern Bulgarian Black Sea coast has been evaluated by analyzing the results of field surveys for 2018 and 2019 based on geological surveys and processing of interferometric images from synthesized aperture radars (SAR). A local image archive of Sentinel-1A / B was created for the period 2015 - 2019 for this region and interferograms were produced every 4 months, 8 months, 1 year and in case of registering an event, led to the activation of landslide processes. A raster map of the concentration of deformations of the Earth's crust was created based on data from the obtained interferograms. Areas with active landslide movements along the Northern Bulgarian Black Sea coast have been identified for monitoring with the Global Navigation Satellite Systems (GNSS). A geodynamic network of 30 points covering the landslide circus ”Dalgiya Yar” and landslide “Thracian Cliffs“ was established and the first measurement cycle was carried out.

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