Akademik Veri Yönetim Sistemi
ENVIRONMENTAL EARTH SCIENCES, sa.17, 2024 (SCI-Expanded)
Monitoring of dam reservoirs is crucial for developing effective management strategies especially in regions with slope instabilities. Recent developments in satellite synthetic aperture radar (SAR) sensors and their processing techniques enabled frequent observations, allowing monitoring of landslides and revealing the triggering factors. In this study, we analyzed the slope movements in Kalekoy dam reservoir built in 2018 in Bingol Province, T & uuml;rkiye using weekly Sentinel-1 SAR time series data. We used LiCSAR (Looking into Continents from Space with SAR) products freely served by the COMET-LiCS (Center for the Observation and Modeling of Earthquake Volcanoes and Tectonics) web portal to perform interferometric SAR (InSAR) time-series analysis. Using land use land cover, snow and vegetation indices derived from the Sentinel-2 optical imagery, and combining with precipitation, lake level measurements, and seismic and anthropogenic activities between 2015 and 2022, our findings revealed that the use of SAR data with regular global coverage is essential for deformation monitoring in dam reservoirs and ensure a comprehensive understanding of landslide phenomena in regions prone to such events. The slope movements were clearly observable in the InSAR time series with seasonal cycles especially in winter, and changes of snow cover were linked to them. Vegetation cover decreased over time in the region, likely influenced by the dam reservoir. Sudden changes in slope deformations were related to lake water levels and spring snowmelt as the saturation of landslide toe zones increased pore water pressure. Despite varying characteristics, changes in lake water levels and snowmelt were common triggers for all landslides analyzed.