Prediction of near-field shear dispersion in an emergent canopy with heterogeneous morphology
The evaluation of longitudinal dispersion in aquatic canopies is necessary to predict the behavior of dissolved species and suspended particles in marsh and wetland systems. Here we consider the influence of canopy morphology on longitudinal dispersion, focusing on transport before constituents h...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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Springer-Verlag
2012
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| Online Access: | http://hdl.handle.net/1721.1/69015 |
| _version_ | 1826210966788898816 |
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| author | Lightbody, Anne 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 Lightbody, Anne Nepf, Heidi |
| author_sort | Lightbody, Anne |
| collection | MIT |
| description | The evaluation of longitudinal dispersion in aquatic canopies is necessary
to predict the behavior of dissolved species and suspended particles in marsh and wetland
systems. Here we consider the influence of canopy morphology on longitudinal
dispersion, focusing on transport before constituents have mixed over depth. Velocity
and longitudinal dispersion were measured in a model canopy with vertically varying
canopy density. The vertical variation in canopy morphology generates vertical variation
in the mean velocity profile, which in turn creates mean-shear dispersion. We
develop and verify a model that predicts the mean-shear dispersion in the near field
from morphological characteristics of the canopy, such as stem diameter and frontal
area. Close to the source, longitudinal dispersion is dominated by velocity heterogeneity
at the scale of individual stems. However, within a distance of approximately
1m, the shear dispersion associated with velocity heterogeneity over depth increases
and eclipses this smaller-scale process. |
| first_indexed | 2024-09-23T14:58:35Z |
| format | Article |
| id | mit-1721.1/69015 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T14:58:35Z |
| publishDate | 2012 |
| publisher | Springer-Verlag |
| record_format | dspace |
| spelling | mit-1721.1/690152022-10-01T23:41:50Z Prediction of near-field shear dispersion in an emergent canopy with heterogeneous morphology Lightbody, Anne Nepf, Heidi Massachusetts Institute of Technology. Department of Civil and Environmental Engineering Nepf, Heidi Lightbody, Anne Nepf, Heidi The evaluation of longitudinal dispersion in aquatic canopies is necessary to predict the behavior of dissolved species and suspended particles in marsh and wetland systems. Here we consider the influence of canopy morphology on longitudinal dispersion, focusing on transport before constituents have mixed over depth. Velocity and longitudinal dispersion were measured in a model canopy with vertically varying canopy density. The vertical variation in canopy morphology generates vertical variation in the mean velocity profile, which in turn creates mean-shear dispersion. We develop and verify a model that predicts the mean-shear dispersion in the near field from morphological characteristics of the canopy, such as stem diameter and frontal area. Close to the source, longitudinal dispersion is dominated by velocity heterogeneity at the scale of individual stems. However, within a distance of approximately 1m, the shear dispersion associated with velocity heterogeneity over depth increases and eclipses this smaller-scale process. National Defense Science and Engineering Graduate Fellowship National Science Foundation (U.S.). Graduate Research Fellowship Program National Science Foundation (U.S.). (Grant EAR 0309188) 2012-02-02T19:46:19Z 2012-02-02T19:46:19Z 2006-08 2005-12 Article http://purl.org/eprint/type/JournalArticle 1567-7419 1573-1510 http://hdl.handle.net/1721.1/69015 Lightbody, A. F., and H. M. Nepf. “Prediction of near-field shear dispersion in an emergent canopy with heterogeneous morphology.” Environmental Fluid Mechanics 6.5 (2006): 477-488. © 2008 Springer Science+Business Media B.V. en_US http://dx.doi.org/10.1007/s10652-006-9002-7 Environmental Fluid Mechanics 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 Springer-Verlag Prof. Nepf |
| spellingShingle | Lightbody, Anne Nepf, Heidi Prediction of near-field shear dispersion in an emergent canopy with heterogeneous morphology |
| title | Prediction of near-field shear dispersion in an emergent canopy with heterogeneous morphology |
| title_full | Prediction of near-field shear dispersion in an emergent canopy with heterogeneous morphology |
| title_fullStr | Prediction of near-field shear dispersion in an emergent canopy with heterogeneous morphology |
| title_full_unstemmed | Prediction of near-field shear dispersion in an emergent canopy with heterogeneous morphology |
| title_short | Prediction of near-field shear dispersion in an emergent canopy with heterogeneous morphology |
| title_sort | prediction of near field shear dispersion in an emergent canopy with heterogeneous morphology |
| url | http://hdl.handle.net/1721.1/69015 |
| work_keys_str_mv | AT lightbodyanne predictionofnearfieldsheardispersioninanemergentcanopywithheterogeneousmorphology AT nepfheidi predictionofnearfieldsheardispersioninanemergentcanopywithheterogeneousmorphology |