dendrogeomorphology; hydro-geomorphic processes; spatio-temporal reconstruction; anthropogenic constructions; mid-mountains; Eastern Sudetes

Debris flows and debris floods cause frequent geomorphic hazards, even in the mid-mountains of Central Europe. In the Hrubý Jeseník Mountains (Eastern Sudetes,Czech Republic), strong anthropogenic interventions have created specific conditions for erosion, transport and accumulation of material released by debris flow/flood events. We present a detailed spatio-temporal reconstruction of the hydro-geomorphic process activity in two adjacent sub-catchments using dendrogeomorphic methods applied to the steep, narrow channels. An analysis of 172 sampled trees [Picea Abies (L.) Karst.] revealed 14 torrential events since 1943 in the Klepáčský stream sub-catchment and 11 events since 1897 in the Keprnický stream sub-catchment. Identical eventswere identified in 1965, 1991, 1997, 2002 and 2010. The event return periods were comparable with return periods from the foothills of the European Alps.