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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2021, Vol. 18, No. 4, pp. 55-65

Detection and monitoring of active deformation areas in the Adler region of the Big Sochi area based on multifrequency InSAR data for the period 2007–2020

E.I. Smolianinova 1 , V.O. Mikhailov 1 , P.N. Dmitriev 1 
1 Schmidt Institute of Physics of the Earth RAS, Moscow, Russia
Accepted: 01.07.2021
DOI: 10.21046/2070-7401-2021-18-4-55-65
We present results of estimation of displacements of the Earth’s surface and buildings in the Adler region of the Big Sochi obtained by InSAR methods. We used multifrequency radar images from ascending and descending orbits covering thirteen-year time interval including ALOS 1 (18 images, 2007–2010), Envisat (12 images, 2011–2012), Sentinel 1A (about 300 images, 2015–2019). SBAS ENVI SARScape software was used for processing. Deformation maps for all the datasets were created. Active deformation areas (ADA) due to landslides and subsidence were revealed. We identified more than 20 active landslides which had not been fixed by field works and 7 subsidence areas in the Imereti lowland. Time series graphs for the period 2007–2020 were plotted and compared with archive precipitation data. The periodicity of maximum and minimum values of mean displacement rates was determined. The times of extreme displacement rate values for different landslides vary within 1–2 months. Maximum displacement rate values were observed in February – March, and minimum values — in August – October. We have not noticed any correlation of subsidence in the Imereti lowland with precipitation. Subsidence curves there demonstrate general tendencies of subsidence and efficiency of drainage and stabilizing systems. Maximum subsidence was revealed in the vicinity of the Zhurnalistov Str. — up to 300 mm for the period 2015–2020. The obtained surface deformation maps agree quite well with ground data. In the densely populated Adler region where it is often difficult to fix small displacements incorporating low cost InSAR helps to add new information to data already available from field works. The presented results for the Adler region demonstrate perspectives of using InSAR in other coastal parts of the Black Sea.
Keywords: Keywords: SAR, InSAR, satellite monitoring, landslides, ground subsidence, Sentinel 1, ALOS 1, Envisat, Adler region, Imereti lowland, Big Sochi
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