Scholarly record

APPLICATION OF INTERFEROMETRY IN LANDSLIDE AREA ANALYSIS

Mila Atanasova

Abstract

Obtaining reliable data on the ongoing risky geo-processes and obtaining adequate and reliable information about them on the current state of the Earth's surface is a key factor in tracking the origin and dynamics of landslide processes as well as assessing the resulting threats to the population and infrastructure. According to information provided by the national authority responsible for the monitoring and keeping track of the landslides over the past two years their number has almost doubled. This is the main reason why it is necessary to develop and implement a rapid and accurate method for their operational observation. One possible solution proposed in this paper is to use the information derived from differential interferometric data processing from the synthesized aperture radar (SAR) data, based on which Earth's crust deformations are registered with magnitude of centimeters. Results from SAR data processing unambiguously indicate the presence of these movements in certain zones of these areas, but verified in-situ GNSS measurements are also required to obtain validated information. From what it was said above formulated is the main objective - studies of the landslide processes through the use of innovative methods. This objective is achieved through implementation of the following: extraction of high quality and reliable information on SAR images focused on regular monitoring of landslide areas integrating interferometric imaging and GNSS data. Based on the freely available SAR data and the software provided by ESA, as well as data from national sources is make a prototype of an archive for monitoring the movements of Earth's crust (landslides, subsidence, etc.). Object of the this studies is the region that has been known for decades with several active large landslides is the Northeast Black Sea coast, which has determined its choice as an region of interest. The outcomes of this research can be summarized as follows ? extensive research was performed on the recent activations of landslides, collected were geodetic data about the deformations caused by them, created was a local image archive of Sentinel-1 satellites for the region of Northeastern Bulgaria; justified is the need to use local DEM in order to improve the quality of the produced interferometric images; created was a set of interferometric images at fixed intervals - monthly, every 4 months, 8 months, a year; generated are thematic interferometric images used in mapping deformations for the region of Northern Black Sea coast, confirmed is the strong relationship between geodetic and satellite derived information concerning ongoing landslide activities.

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DOI resolver: doi.org/10.5593/sgem2019/5.2/s20.014

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