Mountains are home to over 1 billion people and one of the most hazardous landscapes on Earth. The combination of steep topography, active tectonics, shifting orographic rainfall patterns and changing glacier equilibrium lines mean hazards in mountain landscapes are highly dynamic.

In these high-elevation landscapes, processes such as landslides, debris flows and floods, often originate at high altitude and propagate downstream, amplifying the impacts and affecting downstream communities. These events may be widespread or highly localized, and are typically triggered by earthquakes, intense storms, or sequences of compounding factors such as rapid snowpack warming, rain on frozen ground, moraine-dam failures, avalanches, or landslides that initiate further mass mobilization. The cascading nature of these processes means that not only the triggering conditions, but also downstream channel morphology and characteristics (e.g., sediment availability and composition) play a role in shaping the magnitude and frequency of such hazards.

In this session, we are keen to include contributions that cover any or all aspects of the mountain, multi-hazard chain across various spatial and temporal scales, such as those that investigate:
· catastrophic sediment mobilization and cascading hazard chains
· processes and hazards linked to deposition and runout
· concepts of compounding and cascading dynamics
· connectivity between hillslopes and river networks
· controls on the downstream evolution of floods and flows.

We welcome presentations employing observational, conceptual, methodological, or modeling approaches, individually or in combination, across diverse mountain environments. Early-career scientists are particularly encouraged to contribute.