Multi Grain‐Size Total Sediment Load Model Based on the Disequilibrium Length

In natural rivers, sediment heterogeneity and flow variability control the diversity of transport modes that occur. Although these different contribute to total transport, a law extending from bed load suspended is, relevant for wide range mixtures conditions is lacking. Besides, transport-limited assumption often made in modeling fluvial morphodynamics thus potentially misses under-/over-capacity regimes associated with particular grain sizes hydraulic conditions. We present Multi Grain-Size Total Load model based on widely accepted concepts developed within length framework combination an erosion-deposition formulation. The new captures as physical continuum. Transport capacities single or bimodal are reasonably predicted when compared published data scale shear stress through continuously varying exponent linked characteristic height. Modeled lengths extend over several orders magnitude at given Extremely long distances suggest probably never capacity. can be extended populations various threshold motion corrected hiding-exposure. However, further experimental constraints needed better describe entrainment saltation strongly heterogeneous transport. theoretical formalism we introduce paves way Sediment includes variety both non-stationary stationary regimes.