A diffusive model for evaluating thickness of bedload layer
The thickness of the bedload layer is a crucial parameter for evaluating sediment transport rates in open channel flow, but it is often determined empirically. Based on the concept of the hydrodynamic diffusion related to particle particle interactions, an analytical model is proposed in this study...
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| Format: | Journal Article |
| Language: | English |
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2012
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| Online Access: | https://hdl.handle.net/10356/94298 http://hdl.handle.net/10220/7662 |
| _version_ | 1811689960085913600 |
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| author | Cheng, Nian-Sheng |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Cheng, Nian-Sheng |
| author_sort | Cheng, Nian-Sheng |
| collection | NTU |
| description | The thickness of the bedload layer is a crucial parameter for evaluating sediment transport rates in open channel flow, but it is often determined empirically. Based on the concept of the hydrodynamic diffusion related to particle particle interactions, an analytical model is proposed in this study for computing the thickness of the bedload layer. The coefficient of diffusion is assumed to be associated with the momentum transfer induced by the random particle motion and thus can be derived from the shear-induced particle stress. The analytical result shows that the ratio of the bedload thickness to the particle diameter depends on the dimensionless particle diameter and dimensionless bed shear stress. Differences are also examined between the present study and a few empirical formulas that are derived from experimental results for limited bed conditions. |
| first_indexed | 2024-10-01T05:56:24Z |
| format | Journal Article |
| id | ntu-10356/94298 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:56:24Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | ntu-10356/942982020-03-07T11:43:42Z A diffusive model for evaluating thickness of bedload layer Cheng, Nian-Sheng School of Civil and Environmental Engineering DRNTU::Engineering::Civil engineering::Water resources The thickness of the bedload layer is a crucial parameter for evaluating sediment transport rates in open channel flow, but it is often determined empirically. Based on the concept of the hydrodynamic diffusion related to particle particle interactions, an analytical model is proposed in this study for computing the thickness of the bedload layer. The coefficient of diffusion is assumed to be associated with the momentum transfer induced by the random particle motion and thus can be derived from the shear-induced particle stress. The analytical result shows that the ratio of the bedload thickness to the particle diameter depends on the dimensionless particle diameter and dimensionless bed shear stress. Differences are also examined between the present study and a few empirical formulas that are derived from experimental results for limited bed conditions. Accepted version 2012-03-22T07:38:35Z 2019-12-06T18:53:48Z 2012-03-22T07:38:35Z 2019-12-06T18:53:48Z 2003 2003 Journal Article Cheng, N. S. (2003) A diffusive model for evaluating thickness of bedload layer. Advances in Water Resources, 26(8), 875-882. 0309-1708 https://hdl.handle.net/10356/94298 http://hdl.handle.net/10220/7662 10.1016/S0309-1708(03)00062-9 en Advances in water resources © 2003 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: [http://dx.doi.org/10.1016/S0309-1708(03)00062-9]. 8 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Civil engineering::Water resources Cheng, Nian-Sheng A diffusive model for evaluating thickness of bedload layer |
| title | A diffusive model for evaluating thickness of bedload layer |
| title_full | A diffusive model for evaluating thickness of bedload layer |
| title_fullStr | A diffusive model for evaluating thickness of bedload layer |
| title_full_unstemmed | A diffusive model for evaluating thickness of bedload layer |
| title_short | A diffusive model for evaluating thickness of bedload layer |
| title_sort | diffusive model for evaluating thickness of bedload layer |
| topic | DRNTU::Engineering::Civil engineering::Water resources |
| url | https://hdl.handle.net/10356/94298 http://hdl.handle.net/10220/7662 |
| work_keys_str_mv | AT chengniansheng adiffusivemodelforevaluatingthicknessofbedloadlayer AT chengniansheng diffusivemodelforevaluatingthicknessofbedloadlayer |