Analysis of bedload transport in laminar flows

Bedload transport generally depends on the bed shear stress and Reynolds number. Many studies conducted for the condition of turbulent flows have revealed the dependence of the transport rate on the bed shear stress, while knowledge of the Reynolds number effect on the transport rate is very limited...

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Main Author: Cheng, Nian-Sheng
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2012
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Online Access:https://hdl.handle.net/10356/83905
http://hdl.handle.net/10220/7660
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-839052020-03-07T11:43:41Z Analysis of bedload transport in laminar flows Cheng, Nian-Sheng School of Civil and Environmental Engineering DRNTU::Engineering::Civil engineering::Water resources Bedload transport generally depends on the bed shear stress and Reynolds number. Many studies conducted for the condition of turbulent flows have revealed the dependence of the transport rate on the bed shear stress, while knowledge of the Reynolds number effect on the transport rate is very limited. As an extreme case to reflect the viscous effect on sediment transport, sediment transport in laminar flows is considered in this paper. A stochastic approach is adopted to explore how the transport rate can be associated with characteristics of laminar flows. First, the probability of erosion in the absence of turbulence is assumed to depend only on the randomness of bed particles. The probability is then applied to formulate the sediment transport rate, of which the derivation is made largely based on Einstein's bedload theory. The theoretical result indicates that the dimensionless transport rate for laminar flows is dependent on the dimensionless shear stress and dimensionless particle diameter or the shear Reynolds number. Comparisons are finally made between the derived formula and an empirical correlation available in the literature. 2012-03-22T06:44:49Z 2019-12-06T15:34:18Z 2012-03-22T06:44:49Z 2019-12-06T15:34:18Z 2004 2004 Journal Article Cheng, N. S. (2004). Analysis of bedload transport in laminar flows. Advances in Water Resources, 27(9), 937-942. 0309-1708 https://hdl.handle.net/10356/83905 http://hdl.handle.net/10220/7660 10.1016/j.advwatres.2004.05.010 en Advances in water resources © 2004 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Advances in Water Resources, Elsevier. 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: [DOI: http://dx.doi.org/10.1016/j.advwatres.2004.05.010]. 4 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Civil engineering::Water resources
spellingShingle DRNTU::Engineering::Civil engineering::Water resources
Cheng, Nian-Sheng
Analysis of bedload transport in laminar flows
description Bedload transport generally depends on the bed shear stress and Reynolds number. Many studies conducted for the condition of turbulent flows have revealed the dependence of the transport rate on the bed shear stress, while knowledge of the Reynolds number effect on the transport rate is very limited. As an extreme case to reflect the viscous effect on sediment transport, sediment transport in laminar flows is considered in this paper. A stochastic approach is adopted to explore how the transport rate can be associated with characteristics of laminar flows. First, the probability of erosion in the absence of turbulence is assumed to depend only on the randomness of bed particles. The probability is then applied to formulate the sediment transport rate, of which the derivation is made largely based on Einstein's bedload theory. The theoretical result indicates that the dimensionless transport rate for laminar flows is dependent on the dimensionless shear stress and dimensionless particle diameter or the shear Reynolds number. Comparisons are finally made between the derived formula and an empirical correlation available in the literature.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Cheng, Nian-Sheng
format Article
author Cheng, Nian-Sheng
author_sort Cheng, Nian-Sheng
title Analysis of bedload transport in laminar flows
title_short Analysis of bedload transport in laminar flows
title_full Analysis of bedload transport in laminar flows
title_fullStr Analysis of bedload transport in laminar flows
title_full_unstemmed Analysis of bedload transport in laminar flows
title_sort analysis of bedload transport in laminar flows
publishDate 2012
url https://hdl.handle.net/10356/83905
http://hdl.handle.net/10220/7660
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