Density-driven exchange flow between open water and an aquatic canopy
Differences in water density can drive an exchange flow between the vegetated and open regions of surface water systems. A laboratory experiment has been conducted to investigate this exchange flow, using a random array of rigid, emergent cylinders to represent the canopy region. The flow pattern wa...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Geophysical Union
2012
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| Online Access: | http://hdl.handle.net/1721.1/68005 |
| _version_ | 1826203987398885376 |
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| author | Zhang, Xueyan 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 Zhang, Xueyan Nepf, Heidi |
| author_sort | Zhang, Xueyan |
| collection | MIT |
| description | Differences in water density can drive an exchange flow between the vegetated and open regions of surface water systems. A laboratory experiment has been conducted to investigate this exchange flow, using a random array of rigid, emergent cylinders to represent the canopy region. The flow pattern was captured using a CCD camera. The velocity of the current entering the canopy and the volume discharge both decrease with increasing vegetative drag and also decrease gradually over time. Theoretical predictions for velocity and discharge rate are developed and verified with experimental observations. Extensions to field conditions are also discussed. |
| first_indexed | 2024-09-23T12:47:02Z |
| format | Article |
| id | mit-1721.1/68005 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:47:02Z |
| publishDate | 2012 |
| publisher | American Geophysical Union |
| record_format | dspace |
| spelling | mit-1721.1/680052022-10-01T11:04:17Z Density-driven exchange flow between open water and an aquatic canopy Zhang, Xueyan Nepf, Heidi Massachusetts Institute of Technology. Department of Civil and Environmental Engineering Nepf, Heidi Zhang, Xueyan Nepf, Heidi Differences in water density can drive an exchange flow between the vegetated and open regions of surface water systems. A laboratory experiment has been conducted to investigate this exchange flow, using a random array of rigid, emergent cylinders to represent the canopy region. The flow pattern was captured using a CCD camera. The velocity of the current entering the canopy and the volume discharge both decrease with increasing vegetative drag and also decrease gradually over time. Theoretical predictions for velocity and discharge rate are developed and verified with experimental observations. Extensions to field conditions are also discussed. National Science Foundation (U.S.) (grant EAR0509658) 2012-01-06T15:35:58Z 2012-01-06T15:35:58Z 2008-08 2007-11 Article http://purl.org/eprint/type/JournalArticle 0043-1397 W08417 http://hdl.handle.net/1721.1/68005 Zhang, Xueyan, and Heidi M. Nepf. “Density-driven exchange flow between open water and an aquatic canopy.” Water Resources Research 44.8 (2008) p.1-12. ©2008 American Geophysical Union. en_US http://dx.doi.org/10.1029/2007WR006676 Water Resources Research Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Geophysical Union Prof. Nepf |
| spellingShingle | Zhang, Xueyan Nepf, Heidi Density-driven exchange flow between open water and an aquatic canopy |
| title | Density-driven exchange flow between open water and an aquatic canopy |
| title_full | Density-driven exchange flow between open water and an aquatic canopy |
| title_fullStr | Density-driven exchange flow between open water and an aquatic canopy |
| title_full_unstemmed | Density-driven exchange flow between open water and an aquatic canopy |
| title_short | Density-driven exchange flow between open water and an aquatic canopy |
| title_sort | density driven exchange flow between open water and an aquatic canopy |
| url | http://hdl.handle.net/1721.1/68005 |
| work_keys_str_mv | AT zhangxueyan densitydrivenexchangeflowbetweenopenwaterandanaquaticcanopy AT nepfheidi densitydrivenexchangeflowbetweenopenwaterandanaquaticcanopy |