Vertical dispersion in vegetated shear flows
Abstract
Canopy layers control momentum and solute transport to and from the overlying water surface layer. These transfer mechanisms strongly dependent on canopy geometry, affect the amount of solute in the river, the hydrological retention and availability of dissolved solutes to organisms located in the vegetated layers, and are critical to improve water quality. In this work, we consider steady state transport in a vegetated channel under fully developed flow conditions. Under the hypothesis that the canopy layer can be described as an effective porous medium with prescribed properties, i.e., porosity and permeability, we model solute transport above and within the vegetated layer with an advection-dispersion equation with a spatially variable dispersion coefficient (diffusivity). By means of the Generalized Integral Transform Technique, we derive a semianalytical solution for the concentration field in submerged vegetated aquatic systems. We show that canopy layer’s permeability affects the asymmetry of the concentration profile, the effective vertical spreading behavior, and the magnitude of the peak concentration. Due to its analytical features, the model has a low computational cost. The proposed solution successfully reproduces previously published experimental data.
- Authors:
-
- Univ. of Southern California, Los Angeles, CA (United States)
- Stanford Univ., CA (United States)
- Publication Date:
- Research Org.:
- San Diego State Univ., CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1532994
- Grant/Contract Number:
- SC0014227
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Water Resources Research
- Additional Journal Information:
- Journal Volume: 52; Journal Issue: 10; Journal ID: ISSN 0043-1397
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources
Citation Formats
Rubol, Simonetta, Battiato, Ilenia, and de Barros, Felipe P. J. Vertical dispersion in vegetated shear flows. United States: N. p., 2016.
Web. doi:10.1002/2016wr018907.
Rubol, Simonetta, Battiato, Ilenia, & de Barros, Felipe P. J. Vertical dispersion in vegetated shear flows. United States. https://doi.org/10.1002/2016wr018907
Rubol, Simonetta, Battiato, Ilenia, and de Barros, Felipe P. J. Mon .
"Vertical dispersion in vegetated shear flows". United States. https://doi.org/10.1002/2016wr018907. https://www.osti.gov/servlets/purl/1532994.
@article{osti_1532994,
title = {Vertical dispersion in vegetated shear flows},
author = {Rubol, Simonetta and Battiato, Ilenia and de Barros, Felipe P. J.},
abstractNote = {Canopy layers control momentum and solute transport to and from the overlying water surface layer. These transfer mechanisms strongly dependent on canopy geometry, affect the amount of solute in the river, the hydrological retention and availability of dissolved solutes to organisms located in the vegetated layers, and are critical to improve water quality. In this work, we consider steady state transport in a vegetated channel under fully developed flow conditions. Under the hypothesis that the canopy layer can be described as an effective porous medium with prescribed properties, i.e., porosity and permeability, we model solute transport above and within the vegetated layer with an advection-dispersion equation with a spatially variable dispersion coefficient (diffusivity). By means of the Generalized Integral Transform Technique, we derive a semianalytical solution for the concentration field in submerged vegetated aquatic systems. We show that canopy layer’s permeability affects the asymmetry of the concentration profile, the effective vertical spreading behavior, and the magnitude of the peak concentration. Due to its analytical features, the model has a low computational cost. The proposed solution successfully reproduces previously published experimental data.},
doi = {10.1002/2016wr018907},
journal = {Water Resources Research},
number = 10,
volume = 52,
place = {United States},
year = {Mon Sep 26 00:00:00 EDT 2016},
month = {Mon Sep 26 00:00:00 EDT 2016}
}
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Works referencing / citing this record:
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