Hydrologic events and mass-movements (floods, debris floods, flash floods, debris flows, snow avalanches, rockfalls, landslides, etc.) represent major geomorphic hazards in many upland areas. Over the past decades, human pressure has largely increased even in more remote mountain regions, leading to an aggravation of conflicts between natural hazards and societal needs. In addition, changes in climate, land use, sediment availability and other factors affect the impact magnitude and recurrence of hydrological events and leads to changing magnitude-frequency relationships.
Here, we bring together latest results of research covering a wide range of spatial and temporal scales. High resolution results from small mountain catchments are represented as well as results from studies covering millennial change across larger river catchments.
Contributions include:
- Development of new technologies and methodologies to investigate response of hydrological systems to environmental change at different spatial and temporal scales from the uplands to the coast;
- Case studies of sediment dynamics in response to climate and land use change in different physiographic settings;
- Studies highlighting the importance of buffered and delayed fluvial response in the cause-effect relationships between environmental change and fluvial development;
- Studies emphasising the importance of coupling relationships (hillslope-channel, tributary-trunk stream) for sediment fluxes;
- Case studies reconstructing past geomorphic activity to inform present day hazard analyses.

The session is a contribution to the IGBP PAGES program LUCIFS (Landuse and climate impacts on fluvial systems).