Sediment connectivity as a key to understanding the geomorphic effects of extreme rainfall events

This work aims to understand the relationships between different hillslope instability processes triggered by Storm Alex, and the sediment connectivity in two mountain catchments (East catchment - EC- and West catchment WC)to evaluate which process supplied sediments to the valley bottoms and to the outlets. For this study, two adjacent mountain catchments sharing the same outlet were selected, and post-event GeoEye imagery was used to prepare an instability inventory map. Moreover, the Index of Connectivity Map (ICM) was computed using the open source software SedInConnect 2.3. The connectivity index was compared with the instability processes, based on the type of process..