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.