5. Conclusions
Assessment of the retreat rates of the landslide scarp is possible using
both remote sensing from space and orthophoto maps obtained from UAVs
and classical total station surveys. All these sources of information
are interchangeable and complementary when working in the same
coordinate system. The use of historical archival aerial photographs
allows to assess the intensity of this land degradation process since
the initiation of landslide processes.
The monitoring of landslide processes using a set of different
measurement methods reveals that the rate of volumetric changes as a
result of landslide processes at Site 1 has remained stable during the
period of measurements and is – 0.03-0.04
m3/m2/year, with the most
significant contribution to the average annual value being made by
snowmelt runoff. The spatial dynamics of the landslide edge at Site 2
showed a steady decreasing trend of the retreat rate, beginning in
2002-2003, associated with partial overgrowth of the landslide
accumulation zone and its relative stabilization. The average speed of
landslide scarp retreat rate for of the entire observation period is 2.3
m/year. In recent years’ landslide control measures taken in this area
have reduced the landslide scarp retreat rate by more than 2.5 times to
0.84 m/year.