Turbulence Dictates Bedload Transport in Vegetated Channels Without Dependence on Stem Diameter and Arrangement
Vegetation provides habitat and nature-based solutions to coastal flooding and erosion, drawing significant interest in its restoration, which requires an understanding of sediment transport and retention. Laboratory experiments examined the influence of stem diameter and arrangement on bedload sedi...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
American Geophysical Union (AGU)
2022
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| Online Access: | https://hdl.handle.net/1721.1/140351 |
| _version_ | 1826217809170923520 |
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| author | Zhao, Tian Nepf, Heidi M. |
| author2 | Massachusetts Institute of Technology. Department of Civil and Environmental Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Civil and Environmental Engineering Zhao, Tian Nepf, Heidi M. |
| author_sort | Zhao, Tian |
| collection | MIT |
| description | Vegetation provides habitat and nature-based solutions to coastal flooding and erosion, drawing significant interest in its restoration, which requires an understanding of sediment transport and retention. Laboratory experiments examined the influence of stem diameter and arrangement on bedload sediment transport by considering arrays of different stem diameter and mixed diameters. Bedload transport rate was observed to depend on turbulent kinetic energy, with no dependence on stem diameter, which was shown to be consistent with the impulse model for sediment entrainment. Existing predictors of bedload transport for bare beds, based on bed shear stress, were recast in terms of turbulence. The new turbulence-based model predicted sediment transport measured in model canopies across a range of conditions drawn from several previous studies. A prediction of turbulence based on biomass and velocity was also described, providing an important step toward predicting turbulence and bedload transport in canopies of real vegetation morphology. |
| first_indexed | 2024-09-23T17:09:30Z |
| format | Article |
| id | mit-1721.1/140351 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T17:09:30Z |
| publishDate | 2022 |
| publisher | American Geophysical Union (AGU) |
| record_format | dspace |
| spelling | mit-1721.1/1403512024-06-06T19:21:30Z Turbulence Dictates Bedload Transport in Vegetated Channels Without Dependence on Stem Diameter and Arrangement Zhao, Tian Nepf, Heidi M. Massachusetts Institute of Technology. Department of Civil and Environmental Engineering Vegetation provides habitat and nature-based solutions to coastal flooding and erosion, drawing significant interest in its restoration, which requires an understanding of sediment transport and retention. Laboratory experiments examined the influence of stem diameter and arrangement on bedload sediment transport by considering arrays of different stem diameter and mixed diameters. Bedload transport rate was observed to depend on turbulent kinetic energy, with no dependence on stem diameter, which was shown to be consistent with the impulse model for sediment entrainment. Existing predictors of bedload transport for bare beds, based on bed shear stress, were recast in terms of turbulence. The new turbulence-based model predicted sediment transport measured in model canopies across a range of conditions drawn from several previous studies. A prediction of turbulence based on biomass and velocity was also described, providing an important step toward predicting turbulence and bedload transport in canopies of real vegetation morphology. 2022-02-15T16:35:19Z 2022-02-15T16:35:19Z 2021-10-27 Article http://purl.org/eprint/type/JournalArticle 0094-8276 1944-8007 https://hdl.handle.net/1721.1/140351 Zhao, T., & Nepf, H. M. (2021). Turbulence dictates bedload transport in vegetated channels without dependence on stem diameter and arrangement. Geophysical Research Letters, 48, e2021GL095316. en http://dx.doi.org/10.1029/2021gl095316 Geophysical Research Letters Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf American Geophysical Union (AGU) Wiley |
| spellingShingle | Zhao, Tian Nepf, Heidi M. Turbulence Dictates Bedload Transport in Vegetated Channels Without Dependence on Stem Diameter and Arrangement |
| title | Turbulence Dictates Bedload Transport in Vegetated Channels Without Dependence on Stem Diameter and Arrangement |
| title_full | Turbulence Dictates Bedload Transport in Vegetated Channels Without Dependence on Stem Diameter and Arrangement |
| title_fullStr | Turbulence Dictates Bedload Transport in Vegetated Channels Without Dependence on Stem Diameter and Arrangement |
| title_full_unstemmed | Turbulence Dictates Bedload Transport in Vegetated Channels Without Dependence on Stem Diameter and Arrangement |
| title_short | Turbulence Dictates Bedload Transport in Vegetated Channels Without Dependence on Stem Diameter and Arrangement |
| title_sort | turbulence dictates bedload transport in vegetated channels without dependence on stem diameter and arrangement |
| url | https://hdl.handle.net/1721.1/140351 |
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