Equivalent Roughness of Gravel-Bed Rivers
Publication: Journal of Hydraulic Engineering
Volume 134, Issue 6
Abstract
The relation between the equivalent roughness and different grain size percentiles of the sediment in gravel-bed rivers was determined under the hypothesis that the vertical distribution of the flow velocity follows a logarithmic law. A set of 954 data points was selected from rivers with gravel size sediment or larger, with a nonsinuous alignment and free of vegetation or obstacles. According to the results, the roughness is equivalent to approximately , , and . No correlation was detected between the sediment sorting and the sediment mobility index on one hand and, on the other, the coefficient of proportionality of each grain size percentile.
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© 2008 ASCE.
History
Received: Jun 7, 2006
Accepted: Apr 12, 2007
Published online: Jun 1, 2008
Published in print: Jun 2008
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