Dendrogeomorphology; Landslides; River terrace;Floodplain

The steep scarps of river terraces surrounding the floodplains of meandering rivers are locations with concentrations of active geomorphic slope processes. Thus, knowledge of their past behaviour and present-day activity is of high importance. This study presents a dendrogeomorphic analysis of five landslides occurring on river terraces in various types of contact with river flow. In total, 172 disturbed individuals of Pinus sylvestris (L.) and Alnus glutinosa (L.) Gaertn. were used to construct the chronology of the past landslides reactivations. Twenty-three landslide reactivations in ten different event years were detected. The tree-ringbased data revealed different behaviour and activity patterns for landslides with and without direct contact with river. Analysis of historical orthophotos discovered changes in the river pattern that could lead to changes in landslide development in the past. The landslides that were directly affected by river expressed higher frequencies but smaller magnitudes of reactivation events than landslides without direct river contact.