Vol. 11, no.1, 2019
РусскийEnglish
RADIOLOCATION
POTENTIAL OF PHASE MEASUREMENTS IN RADAR INTERFEROMETRY FOR THE OBSERVATION OF EMERGENCY SITUATIONS BUREYA LANDSLIDE CASE
Alexander I. Zakharov, Liudmila N. Zakharova
Kotelnikov Institute of Radioengineering and Electronics of RAS, Fryazino branch, http://fire.relarn.ru
Fryazino 141190, Moscow region, Russian Federation
Received 13.03.2019, attached 29.03.2019
Abstract. The results of the European spaceborne Sentinel-1 synthetic aperture radar differential interferometry data processing for the Bureya landslide area aimed at detection and assessment the consequences of catastrophic event in December 2018 are presented. More than 20 scenes, obtained in SAR observations from relative orbits 134 and 61 for the period from December 2018 to March 2019 provided high temporal stability of signal backscatter from landslide slopes, were used. Analysis of phase measurements on interferograms with small spatial baselines and on differential interferograms (in the case of a large baseline) allows us reach the conclusion about temporal stability of the surface of the landslide circus during the entire period covered by the Sentinel-1 SAR observations. No noticeable (more than a few millimeters) small-scale displacements of the slopes in the end of January 2019 due to blasting operations in the riverbed cofferdam were revealed. We estimated landslide scales also. The volume of the ground that slid down the slope was not less than 18.5 million m3, the maximal vertical displacement of the scattering surface after the landslide compared with SRTM digital elevation model reached 140-150 m, the landslide area in the vertical projection is 22.8 ha. Thus, Sentinel-1 radar data demonstrated the its potential to monitor the stability of landslide slopes by means of radar interferometry technique and high-accuracy of the measurements of probable small-scale surface displacements provided the conduction of the radar observations in the winter time period.
Keywords: landslide, synthetic aperture radar (SAR), SAR interferometry, surface displacement measurement, digital elevation model
UDC 621.396.96
RENSIT, 2019, 11(1):31-38 DOI: 10.17725/rensit.2019.11.031
Full-text electronic version of this article - web site http://en.rensit.ru/vypuski/article/270/11(1)31-38e.pdf