The long-term failure processes of a large reactivated landslide in the Xiluodu reservoir area based on InSAR technology

After the first impoundment of reservoir, many landslides seriously threatened safety reservoir. Accurate determination relationship between landslide deformation characteristics and water-level fluctuations is crucial. However, with increasing number fluctuation cycles, were also changing, long-term continuous monitoring to capture failure process reservoir necessary. A large reacted in Xiluodu was set as an example, using InSAR technology seek its variations over nine years. The local rate annual maximum area variation analyzed by based on Sentinel-1 descending SAR data from October 2014 June 2022. According regional characteristics, divided into three zones: Zone I above elevation 950 m; II below it; front edge II, where collapse happened, further III. In general, accumulated largest, followed III, smallest. average NLJL mainly affected drawdown water level, impacts rising III similar. analyzing a nine-year area, mechanism changed retrogressive type progressive one after then back 2017. impact most substantial years impoundment.