3.2 Site 2.
Analysis of landslide scarp retreat was chosen as the primary method for
studying bank transformation at Site 2. A wide range of data was used to
perform this task (Table 4).
Archived aerial and satellite images were used to study the changes in
the shoreline position, and modern satellite images were used as base
for their spatial reference. Since 2002, a topographic survey was
carried out in a relative coordinate system. A network of reference
points was created, to provide multi-term survey. The reference points’
coordinates were determined using a Trimble M3 total station. A GNSS
receiver using real-time kinematic corrections was used to transform the
obtained results into the global coordinate system in 2012.
The Digital Shoreline Analysis System (DSAS), as an extension module of
the ArcGIS software, was used to quantify shoreline displacement
(Himmelstoss et al. , 2018). This module is effective for
simplifying the analysis of shoreline position changes (Oyedotun, 2014;
Nicu, 2021). The 1958 shoreline (immediately after filling the
reservoir) was taken as a baseline. Following parameters were selected:
distance between the transects – 15 m, search radius –300 m. Based on
the obtained transects, shoreline indicators such as linear retreat rate
(m/year), shoreline displacement (m) were automatically calculated.