Author(s): Douclas B. Moog; Peter J. Whiting

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Abstract: Traditionally, bedload sediment transport rates are predicted using a power law of discharge, or discharge in excess of some critical value. Such power laws are generally developed by regression of the logarithms of sediment and flow discharge. This study examines the relationship of bedload particle size to the sediment rating exponent, critical discharge, and effective discharge, applying the standard technique to data collected in fourteen streams, for bedload from 0.5 to 4 mm in size. The exponent is found to increase with particle size only when critical discharge is not included in the regression. However, this result does not appear to be explained by the theoretical increase of critical discharge with particle size, since the empirically-determined critical discharges instead decrease with particle size. Adding critical discharge to the regression does lead to a large increase in predictive capability.

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Year: 1997