Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2019, Vol. 16, No. 5, pp. 113-119
Long-term monitoring of the landslide process on Bureya riverbank based on interferometric L-band radar data
V.G. Bondur
1 , L.N. Zakharova
2 , A.I. Zakharov
2 , T. N. Chimitdorzhiev
3 , A. V. Dmitriev
3 , P. N. Dagurov
3 1 Research Institute of Aerospace Monitoring “Aerocosmos”, Moscow, Russia
2 V. A. Kotelnikov Institute of Radioengineering and Electronics RAS, Fryazino Branch, Fryazino, Moscow Region, Russia
3 Institute of Physical Materials Science SB RAS, Ulan-Ude, Russia
Accepted: 06.09.2019
DOI: 10.21046/2070-7401-2019-16-5-113-119
In this paper, the results of interferometric processing and analysis of Japanese spaceborne PALSAR-1 and PALSAR-2 L-band radar images covering the area of the Bureya River with landslide famous for the catastrophic landfall in December 2018 are presented. Available archival radar images cover the observation intervals of 2006–2011 and 2014 – now; they allow studying long-term dynamics of this landslide evolution. Thanks to relatively high temporal stability of scattering properties of the surface in L frequency band, it is possible to detect the displacements of the landslide surface and to measure total amplitudes of displacements over time intervals up to 2 years. According to our estimations, the velocities of summer displacements are typically higher than wintertime ones. The displacements are low in 2006-2010 (1.6–1.9 cm/month), then they increase significantly in 2015–2016 (4.7–4.9 cm/month), the maximal measured velocity in summer 2016 reaches 10.7 cm/month. It is likely that the activation of the landslide process corresponds to the time of completion of the reservoir filling in 2006–2009, and it is provoked by both the initial rising and seasonal oscillations of the water level.
Keywords: Bureya, radar, PALSAR, radar interferometry, estimation of surface displacements, landslide, reservoir
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