Fluvial morphodynamics are characterized by the coupling between sediment supply, storage, and transport, as well as between flow resistance and bed morphology. However, the relationships between these characteristics vary across fluvial landscapes. Specifically in steep channels, the threshold for motion has been shown to change significantly in space and time, and possibly with slope, and observed sediment transport rates are lower than predicted based on classic equations developed for lowland channels. Macro-roughness elements including large-wood structures complicate estimates of flow resistance and boundary shear stress, and hillslope-channel coupling adds to system disorder. The poor performance of traditional sediment transport approaches consequently limits the utility of channel evolution models to predict the morphology of steep mountain rivers – the lower boundary control of mountainous terrain evolution.
This session welcomes field, experimental, theoretical, and modelling efforts aimed at improving (1) our understanding of the morphodynamics of mountain river channels, as well as (2) predictive models for sediment transport in mountainous channels. In addition, we welcome studies spanning a range of spatial scales, from the grain to landscape scale.

Co-organized as HS9.2.3
Convener: Matteo Saletti | Co-conveners: Claire Masteller, Alexander Beer, Shawn M. Chartrand, Kimberly Huppert
| Tue, 09 Apr, 14:00–15:45
Room G2
| Attendance Wed, 10 Apr, 10:45–12:30
Hall X2

Tuesday, 9 April 2019 | Room G2

Chairperson: Claire Masteller, Kim Huppert
14:00–14:15 |
| solicited
Marisa Palucis, Thomas Ulizio, and Michael Lamb
14:15–14:30 |
Chendi Zhang, Mengzhen Xu, Yuqiao Feng, Marwan Hassan, and Zhaoyin Wang
14:30–14:45 |
Michael Engel, Velio Coviello, Andrea Andreoli, Anuschka Buter, Christian Kofler, Vittoria Scorpio, Lindsey Nicholson, Shusuke Miyata, Ricardo Carillo, and Francesco Comiti
14:45–15:00 |
Velio Coviello, Gianluca Vignoli, Silvia Simoni, Andrea Andreoli, Michael Engel, Vittoria Scorpio, Walter Bertoldi, Rudi Nadalet, Roberto Dinale, and Francesco Comiti
15:30–15:45 |
| solicited
Colin B. Phillips, Carlos A. Rogéliz Prada, Daniel E. Horton, and Aaron I. Packman