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Earth Surface Dynamics An interactive open-access journal of the European Geosciences Union
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Volume 4, issue 3
Earth Surf. Dynam., 4, 685–703, 2016
https://doi.org/10.5194/esurf-4-685-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Earth Surf. Dynam., 4, 685–703, 2016
https://doi.org/10.5194/esurf-4-685-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 29 Aug 2016

Research article | 29 Aug 2016

Gravel threshold of motion: a state function of sediment transport disequilibrium?

Joel P. L. Johnson
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Cited articles  
Ancey, C., Davison, A. C., Bohm, T., Jodeau, M., and Frey, P.: Entrainment and motion of coarse particles in a shallow water stream down a steep slope, J. Fluid Mech., 595, 83–114, https://doi.org/10.1017/s0022112007008774, 2008.
Buffington, J. M.: The legend of A. F. Shields, J. Hydraul. Eng.-ASCE, 125, 376–387, https://doi.org/10.1061/(asce)0733-9429(1999)125:4(376), 1999.
Buffington, J. M. and Montgomery, D. R.: A systematic analysis of eight decades of incipient motion studies, with special reference to gravel-bedded rivers, Water Resour. Res., 33, 1993–2029, https://doi.org/10.1029/97wr03190, 1997.
Bunte, K., Abt, S. R., Swingle, K. W., Cenderelli, D. A., and Schneider, J. M.: Critical Shields values in coarse-bedded steep streams, Water Resour. Res., 49, 7427–7447, https://doi.org/10.1002/2012wr012672, 2013.
Buscombe, D. and Conley, D. C.: Effective shear stress of graded sediments, Water Resour. Res., 48, W05506, https://doi.org/10.1029/2010wr010341, 2012.
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Accurately predicting gravel transport rates in mountain rivers is difficult because of feedbacks with channel morphology. River bed surfaces evolve during floods, influencing transport rates. I propose that the threshold of gravel motion is a state variable for channel reach evolution. I develop a new model to predict how transport thresholds evolve as a function of transport rate, and then use laboratory flume experiments to calibrate and validate the model.
Accurately predicting gravel transport rates in mountain rivers is difficult because of...
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