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Title: Average velocity of solitary coarse grain in flows over smooth and rough beds
Authors: Cheng, Nian-Sheng
Emadzadeh, Adel
Keywords: DRNTU::Engineering::Civil engineering::Transportation
Issue Date: 2014
Source: Cheng, N.-S., & Emadzadeh, A. (2014). Average velocity of solitary coarse grain in flows over smooth and rough beds. Journal of hydraulic engineering, 140(6).
Series/Report no.: Journal of hydraulic engineering
Abstract: A formula is derived for the prediction of the average velocity of a solitary coarse grain moving over a rigid flat channel bed. To verify the theoretical consideration, data collected in the present study and reported in the literature (811 sets in total) are analyzed for typical bed roughness configurations. The results show significant improvements in the prediction of solitary grain velocity for both smooth- and rough-bed conditions in comparison with other formulas available in the literature. From the proposed formula, it follows that for rough-bed conditions, the dimensionless grain velocity depends on the Shields number and also the ratio of bed-roughness height to the grain diameter. The present study is limited to motion of solitary grains, but the result obtained implies that bed-load transport rate could be also affected by the equivalent bed-roughness height even under mobile bed conditions and such effects may become pronounced for nonuniform sediments.
DOI: 10.1061/(ASCE)HY.1943-7900.0000875
Schools: School of Civil and Environmental Engineering 
Rights: © 2014 American Society of Civil Engineers. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Hydraulic Engineering, American Society of Civil Engineers. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [Article DOI:].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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