Prediction of near-field shear dispersion in an emergent canopy with heterogeneous morphology
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Nepf-prediction of near-field.pdf
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Author(s)
Lightbody, Anne
Nepf, Heidi
Date Issued
August 2006
Journal
Environmental Fluid Mechanics
Publisher
Springer-Verlag
Citation
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.
Version
Author's final manuscript
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
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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.
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DOI of Published Version
https://doi.org/10.1007/s10652-006-9002-7
