Flow and Transport in Regions with Aquatic Vegetation
This review describes mean and turbulent flow and mass transport in the presence of aquatic vegetation. Within emergent canopies, the turbulent length scales are set by the stem diameter and spacing, and the mean flow is determined by the distribution of the canopy frontal area. Near sparse submerge...
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| Format: | Article |
| Language: | en_US |
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Annual Reviews
2013
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| Online Access: | http://hdl.handle.net/1721.1/79046 |
| _version_ | 1826208037972475904 |
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| author | Nepf, Heidi |
| author2 | Massachusetts Institute of Technology. Department of Civil and Environmental Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Civil and Environmental Engineering Nepf, Heidi |
| author_sort | Nepf, Heidi |
| collection | MIT |
| description | This review describes mean and turbulent flow and mass transport in the presence of aquatic vegetation. Within emergent canopies, the turbulent length scales are set by the stem diameter and spacing, and the mean flow is determined by the distribution of the canopy frontal area. Near sparse submerged canopies, the bed roughness and near-bed turbulence are enhanced, but the velocity profile remains logarithmic. For dense submerged canopies, the drag discontinuity at the top of the canopy generates a shear layer, which contains canopy-scale vortices that control the exchange of mass and momentum between the canopy and the overflow. The canopy-scale vortices penetrate a finite distance into the canopy, δe, set by the canopy drag. This length scale segregates the canopy into two regions: The upper canopy experiences energetic turbulent transport, controlled by canopy-scale vortices, whereas the lower canopy experiences diminished transport, associated with the smaller stem-scale turbulence. The canopy-scale vortices induce a waving motion in flexible blades, called a monami. |
| first_indexed | 2024-09-23T13:59:29Z |
| format | Article |
| id | mit-1721.1/79046 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:59:29Z |
| publishDate | 2013 |
| publisher | Annual Reviews |
| record_format | dspace |
| spelling | mit-1721.1/790462022-10-01T18:23:49Z Flow and Transport in Regions with Aquatic Vegetation Nepf, Heidi Massachusetts Institute of Technology. Department of Civil and Environmental Engineering Nepf, Heidi Nepf, Heidi This review describes mean and turbulent flow and mass transport in the presence of aquatic vegetation. Within emergent canopies, the turbulent length scales are set by the stem diameter and spacing, and the mean flow is determined by the distribution of the canopy frontal area. Near sparse submerged canopies, the bed roughness and near-bed turbulence are enhanced, but the velocity profile remains logarithmic. For dense submerged canopies, the drag discontinuity at the top of the canopy generates a shear layer, which contains canopy-scale vortices that control the exchange of mass and momentum between the canopy and the overflow. The canopy-scale vortices penetrate a finite distance into the canopy, δe, set by the canopy drag. This length scale segregates the canopy into two regions: The upper canopy experiences energetic turbulent transport, controlled by canopy-scale vortices, whereas the lower canopy experiences diminished transport, associated with the smaller stem-scale turbulence. The canopy-scale vortices induce a waving motion in flexible blades, called a monami. National Science Foundation (U.S.) (EAR 0309188) National Science Foundation (U.S.) (EAR 0125056) National Science Foundation (U.S.) (EAR0738352) National Science Foundation (U.S.) (OCE0751358) 2013-05-30T19:06:33Z 2013-05-30T19:06:33Z 2012-01 Article http://purl.org/eprint/type/JournalArticle 0066-4189 1545-4479 http://hdl.handle.net/1721.1/79046 Nepf, Heidi M. Flow and Transport in Regions with Aquatic Vegetation. Annual Review of Fluid Mechanics 44, no. 1 (January 21, 2012): 123-142. en_US http://dx.doi.org/10.1146/annurev-fluid-120710-101048 Annual Review of Fluid Mechanics Creative Commons Attribution-Noncommercial-Share Alike 3.0 http://creativecommons.org/licenses/by-nc-sa/3.0/ application/pdf Annual Reviews Prof. Nepf via Anne Graham |
| spellingShingle | Nepf, Heidi Flow and Transport in Regions with Aquatic Vegetation |
| title | Flow and Transport in Regions with Aquatic Vegetation |
| title_full | Flow and Transport in Regions with Aquatic Vegetation |
| title_fullStr | Flow and Transport in Regions with Aquatic Vegetation |
| title_full_unstemmed | Flow and Transport in Regions with Aquatic Vegetation |
| title_short | Flow and Transport in Regions with Aquatic Vegetation |
| title_sort | flow and transport in regions with aquatic vegetation |
| url | http://hdl.handle.net/1721.1/79046 |
| work_keys_str_mv | AT nepfheidi flowandtransportinregionswithaquaticvegetation |