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Volume 6, issue 4
Earth Surf. Dynam., 6, 989-1010, 2018
https://doi.org/10.5194/esurf-6-989-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Earth Surf. Dynam., 6, 989-1010, 2018
https://doi.org/10.5194/esurf-6-989-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 06 Nov 2018

Research article | 06 Nov 2018

Morphodynamic model of the lower Yellow River: flux or entrainment form for sediment mass conservation?

Chenge An et al.
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An, C., Fu, X., Wang, G., and Parker, G.: Effect of grain sorting on gravel bed river evolution subject to cycled hydrographs: Bed load sheets and breakdown of the hydrograph boundary layer, J. Geophys. Res.-Earth, 122, 1513–1533, https://doi.org/10.1002/2016JF003994, 2017.
Armanini, A. and Di Silvio, G.: A one-dimensional model for the transport of a sediment mixture in non-equilibrium conditions, J. Hydraul. Res., 26, 275–292, https://doi.org/10.1080/00221688809499212, 1988.
Bell, R. G. and Sutherland, A. J.: Nonequilibrium bedload transport by steady flows, J. Hydraul. Eng., 109, 351–367, 1983.
Blom, A.: Different approaches to handling vertical and streamwise sorting in modeling river morphodynamics, Water Resour. Res., 44, W03415, https://doi.org/10.1029/2006WR005474, 2008.
Blom, A., Viparelli, E., and Chavarrías, V.: The graded alluvial river: profile concavity and downstream fining, Geophys. Res. Lett., 43, 1–9, https://doi.org/10.1002/2016GL068898, 2016.
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In most models of river morphodynamics, sediment mass conservation is described by the Exner equation, which may take either the flux form or the entrainment form. Here we compare the two forms of the Exner equation under conditions typical of the lower Yellow River. We find that when using a single sediment grain size, there is little difference between the two forms. But when considering sediment mixtures, the two forms will show very different patterns of grain sorting.
In most models of river morphodynamics, sediment mass conservation is described by the Exner...
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