1.1 Research methods for landslide processes
At present, there is a large range of methods for monitoring and estimation the intensity of exogenous processes (Savvaidis, 2003; Tsaiet al. , 2012; Pradhan, 2017; Gafurov et al. , 2018; Usmanovet al. , 2018; Gupta & Shukla, 2018; Mertens et al. , 2018). These mainly consist of collecting instrumental topographic surveys and remote sensing data, allowing the study of slope processes over several decades. In order to assess the rates of geomorphic processes occurring on the reservoir shores, this study applied alongside traditional methods (topographic field surveys) a set of modern methods: i.e. terrestrial laser scanning (TLS), unmanned aerial vehicle UAV, remote sensing and a global navigation satellite system (GNSS). These techniques allow a quickly recording with a high accuracy for determining of the shore process rates and displaced material volumes by landslides. After a critical evaluation of the various methods and a description of the study area, we report on the methods applied in this study.