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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, 2025, Vol. 22, No. 1, pp. 43-55

Development of slope processes in the vicinity of the Sarez Lake dam in 2023 as viewed by spaceborne SAR interferometry

L.N. Zakharova 1 , A.I. Zakharov 1 , A.L. Strom 2 
1 Kotelnikov Institute of Radioengineering and Electronics RAS, Fryazino Branch, Fryazino, Moscow Region, Russia
2 Institute Hydroproject JSC, Moscow, Russia
Accepted: 21.11.2024
DOI: 10.21046/2070-7401-2025-22-1-43-55
The paper focuses on the assessment of slope dynamics on the banks of the Sarez Lake near the Usoi dam in Tajikistan. Sentinel-1 synthetic aperture radar (SAR) data of European Space Agency have been processed for the time period since February 2023 till February 2024. Surface displacements were detected on both left and right banks of the lake. In order to extract the components of the full displacement vector, we used data from ascending and descending orbits of Sentinel-1. The influence of the troposphere on the interferometric phase was taken into account. Two approaches to full displacement vector estimation were used: the first one assumes zero North-South component of the displacement, the second one assumes the motion vector oriented generally in the slope direction with possible slight deflections in the vertical plane. Different details in the displacement maps created by using the two approaches are described. Maximal displacement velocities are estimated as 243 mm/year and 169 mm/year on the right and left slopes, respectively. The stability of the Usoi dam throughout the entire year-long period was demonstrated. It is concluded that this area needs to be closely monitored and further measurements are necessary.
Keywords: landslides, Sarez Lake, synthetic aperture radar, SAR, SAR interferometry, InSAR, differential InSAR, DInSAR, displacement assessment
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