The transport, erosion and deposition of sediment determines channel morphology. At the same time, channel morphology and bed roughness act as boundary condition for sediment transport. These complex interactions between hydraulics, transport and bed morphology take place at different timescales, from short term response to individual floods to long term response to the representative flow conditions. In this session we welcome contributions on sediment transport processes and how they shape the bed or channel at all timescales, addressing questions like:

What is the role of extreme events in determining channel morphology compared to gradual channel change?
How does channel morphology and large-scale roughness affect sediment transport and what is the role of sediment transport in shaping the channel?
How variable is bed roughness in time and space, and how does it evolve during floods of different magnitude? Are thresholds involved and can the relative roles of different flood magnitudes be quantified?
How do we best identify, measure and monitor suitable morphological parameters in the field?
How are bedforms created or destroyed, and how do they evolve?

We welcome contributions at all spatial scales. This includes work on local transport and erosion processes in the river, on bedform dynamics and occurrence, and on reach-scale features such as step-pool morphologies. Contributions may come from field-based as well as experimental studies.