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Transverse and longitudinal mixing in real emergent vegetation at low velocities
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Sonnenwald, F., Hart, James, West, Patrick, Stovin, V. R. and Guymer, I. (2017) Transverse and longitudinal mixing in real emergent vegetation at low velocities. Water Resources Research, 53 (1). pp. 961-978. doi:10.1002/2016WR019937
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Official URL: http://dx.doi.org/10.1002/2016WR019937
Abstract
Understanding solute mixing within real vegetation is critical to predicting and evaluating the performance of engineered natural systems such as stormwater ponds. For the first time, mixing has been quantified through simultaneous laboratory measurements of transverse and longitudinal dispersion within artificial and real emergent vegetation. Dispersion coefficients derived from a routing solution to the 2D Advection Dispersion Equation (ADE) are presented that compare the effects of vegetation type (artificial, Typha latifolia or Carex acutiformis) and growth season (winter or summer). The new experimental dispersion coefficients are plotted with the experimental values from other studies and used to review existing mixing models for emergent vegetation. The existing mixing models fail to predict the observed mixing within natural vegetation, particularly for transverse dispersion, reflecting the complexity of processes associated with the heterogeneous nature of real vegetation. Observed stem diameter distributions are utilized to highlight the sensitivity of existing models to this key length-scale descriptor, leading to a recommendation that future models intended for application to real vegetation should be based on probabilistic descriptions of both stem diameters and stem spacings. This article is protected by copyright. All rights reserved.
| Item Type: | Journal Article | ||||||||||
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| Subjects: | T Technology > TD Environmental technology. Sanitary engineering | ||||||||||
| Divisions: | Faculty of Science > Engineering | ||||||||||
| Library of Congress Subject Headings (LCSH): | Storm water retention basins, Aquatic plants | ||||||||||
| Journal or Publication Title: | Water Resources Research | ||||||||||
| Publisher: | American Geophysical Union | ||||||||||
| ISSN: | 0043-1397 | ||||||||||
| Official Date: | 31 January 2017 | ||||||||||
| Dates: |
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| Date of first compliant deposit: | 11 January 2017 | ||||||||||
| Volume: | 53 | ||||||||||
| Number: | 1 | ||||||||||
| Page Range: | pp. 961-978 | ||||||||||
| DOI: | 10.1002/2016WR019937 | ||||||||||
| Status: | Peer Reviewed | ||||||||||
| Publication Status: | Published | ||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC) | ||||||||||
| Grant number: | EP/ K024442/1, EP/K025589/1 |
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