Articles | Volume 13, issue 4
https://doi.org/10.5194/esurf-13-723-2025
https://doi.org/10.5194/esurf-13-723-2025
Research article
 | 
25 Aug 2025
Research article |  | 25 Aug 2025

Effect of grain-sorting waves on alternate bar dynamics: implications of the breakdown of the hydrograph boundary layer

Soichi Tanabe and Toshiki Iwasaki

Video supplement

Movie S1 - The detrended riverbed elevation and the geometric mean grain size in Case 2-n- Soichi Tanabe https://doi.org/10.5446/70174

Movie S2 - The detrended riverbed elevation and the geometric mean grain size in Case 1-n- Soichi Tanabe https://doi.org/10.5446/70172

Movie S3 -- The two-dimensional riverbed variation from the initial riverbed elevation in Case 2-b- Soichi Tanabe https://doi.org/10.5446/70173

Movie S4 - The two-dimensional riverbed variation from the initial riverbed elevation in Case 1-b- Soichi Tanabe https://doi.org/10.5446/70175

Movie S5 - Longitudinal riverbed variation from the initial riverbed elevation and geometric mean grain size in Case 2-b- Soichi Tanabe https://doi.org/10.5446/70176

Movie S6 - Longitudinal riverbed variation from the initial riverbed elevation and geometric mean grain size in Case 1-b- Soichi Tanabe https://doi.org/10.5446/70177

Movie S7 - Longitudinal distribution of the magnitude of cross-sectional average sediment transport flux in Case 1-b- Soichi Tanabe https://doi.org/10.5446/70178

Movie S8 - Longitudinal distribution of the magnitude of cross-sectional average sediment transport flux in Case 2-b- Soichi Tanabe https://doi.org/10.5446/70179

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Short summary
We try to understand how the sediment supply from the upstream river reach affects the downstream river morphology using a numerical model. If the supplied sediment is composed of a variety of size classes of particles, a small bed wave that is composed of mainly fine particles (sorting wave) can propagate to downstream for a very long distance. However, the presence of bars suppresses the effect of the sorting wave greatly, and thus the sediment supply has a limited role in the downstream river morphology.
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