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- W2023283886 abstract "Accumulation of sediment in contour channels or terraces often occurs when overland flow passes from a hillslope to a lesser channel slope and sediment load is reduced. This article describes a field evaluation of an approximate analytic solution to a multi-class net deposition equation in a channel. The approximate analytic solution requires input settling classes to be of equal mass, which can be interpolated from a measured settling velocity distribution. Lateral input of runoff and suspended sediment into the channel was approximated by representing the channel as a series of 20 m segments that received hillslope inputs at their uppermost end via ephemeral gullies. At the beginning of each channel segment, new settling velocity classes (of equal mass) were interpolated, following mixing of inputs from the contributing hillslope segment and the previous channel segment. This procedure was found to be stable over the whole length of the channel only if the number of interpolated settling velocity classes (I) was >60. Precise measurement of such a large I value is infeasible, and users of the interpolation procedure should consider any potential errors that might occur if interpolating from a small number of measured data points. Using the model, the input sediment load was partitioned into deposition in the channel and output suspended sediment, which compared well with field measurements. However, enrichment of slower settling velocity fractions, relative to the input sediment, was overpredicted when compared to the only available measurement of the output settling velocity distribution. This finding is consistent with other applications of the model and with some applications of simple settling theory. Outputs were shown to be relatively insensitive to: surface roughness, threshold stream power beyond which re-entrainment occurs, and the proportion of stream power available for re-entrainment. It is likely that the approximate analytic solution is not applicable where channel segments are 10 m or less, in which case the full solution should be used." @default.
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- W2023283886 date "2006-01-01" @default.
- W2023283886 modified "2023-10-14" @default.
- W2023283886 title "Field Evaluation of a Multi-Class Sediment Net Deposition Model in Contour Channels" @default.
- W2023283886 doi "https://doi.org/10.13031/2013.22050" @default.
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