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MONITORING OF THE LANDSLIDE PROCESSES AT THE "DALGIYA YAR" LANDSLIDE
Abstract
The study of landslides is of particular importance because they can lead to great material damage. The region of the Bulgarian northern Black Sea coast is affected by many landslides and it is important to monitor motions of the major landslides in this area. The paper outline deformation analysis of the landslide processes in the area of ?Dalgiya yar?. It is a landslide circus from the Varna landslide region that covers several active landslides, whose boundaries are overlapping and for that reason are difficult to differentiate. For some of the landslides located in this area, a smaller landslide could be delineated inside them. For this study we used data from two epochs measurements - in 2013 by classical and in 2018 by GNSS, provided by Ministry of Regional Development and Public Works and new GNSS measurements performed in 2019 year of the geodetic network in the ?Dalgiya Yar? landslide. The coordinates obtained by processing of the last GNSS measurements along with coordinates from first two epochs are processed together to solve for point?s velocities of the established geodetic control network. Strain rates, crustal dynamic parameters and point?s velocities of the network are obtained. The horizontal motions of the landslide vary from 13 mm/y to 46 mm/y. Separately, the landslide movements are estimated by D-iNsar technics using images produced by Sentinel-1. Comparison of the results from both methods shows a good agreement. The results contribute to obtain reliable information about the origin and dynamics of the landslide movement process as well as the assessment of the resulting hazards for the population and the infrastructure. As a whole, the results unambiguously show the necessity to permanently monitor the landslide and the same is valid for most of the North Black Sea landslides.
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