Estimating Sediment Mass Fluxes on Surfaces Sheltered by Live Vegetation
2017
Walter, Benjamin | Voegeli, Christian | Horender, Stefan
We present a simple model based on already existing and widely used equations for estimating particle mass fluxes on surfaces sheltered by live vegetation. Wind-tunnel measurements of vertical profiles of mass flux in three different dense live plant canopies, and as a function of the spatially averaged skin friction velocity [Formula: see text], provide the baseline set of data. For the bare-sand surface, the total mass flux Q shows the typical [Formula: see text] increase with increasing skin friction velocity [Formula: see text], where b is a constant and [Formula: see text] is the threshold at the onset of particle erosion. Similar relations, however, with different values for b and [Formula: see text] compared to the bare-sand surface were found for experiments with 5.25 and 24.5 plants [Formula: see text] and can be explained by the spatial variations of [Formula: see text] for the canopy cases. Based on the resulting parameters b and [Formula: see text], which are found to be functions of the roughness density [Formula: see text], we present a final simple relation [Formula: see text] used for estimating the total mass flux for surfaces sheltered by live vegetation.
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