Hydrodynamics of vegetated channels

This paper highlights some recent trends in vegetation hydrodynamics, focusing on conditions within channels and spanning spatial scales from individual blades, to canopies or vegetation patches, to the channel reach. At the blade scale, the boundary layer formed on the plant surface plays a role in...

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Bibliographic Details
Published in:Journal of hydraulic research Vol. 50; no. 3; pp. 262 - 279
Main Author: Nepf, Heidi M.
Format: Journal Article
Language:English
Published: Delft Taylor & Francis 01.06.2012
International Association for Hydraulic Research
Taylor & Francis Ltd
Subjects:
blade boundary layer
Boundary layer
Boundary layers
Canopies
channel resistance
Earth sciences
Earth, ocean, space
Exact sciences and technology
Flow resistance
Hydrodynamics
Hydrology
Hydrology. Hydrogeology
Nutrient flow
Nutrient uptake
sediment transport
Studies
turbulence
Vegetation
stress
channel resistance
boundary layer
mixing
vegetation
hydrodynamics
turbulence
blade boundary layer
nutrients
surface water
hydraulics
sediment transport
channels
geometry
methodology
ISSN:0022-1686, 1814-2079
Online Access:Get full text
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Summary:This paper highlights some recent trends in vegetation hydrodynamics, focusing on conditions within channels and spanning spatial scales from individual blades, to canopies or vegetation patches, to the channel reach. At the blade scale, the boundary layer formed on the plant surface plays a role in controlling nutrient uptake. Flow resistance and light availability are also influenced by the reconfiguration of flexible blades. At the canopy scale, there are two flow regimes. For sparse canopies, the flow resembles a rough boundary layer. For dense canopies, the flow resembles a mixing layer. At the reach scale, flow resistance is more closely connected to the patch-scale vegetation distribution, described by the blockage factor, than to the geometry of individual plants. The impact of vegetation distribution on sediment movement is discussed, with attention being paid to methods for estimating bed stress within regions of vegetation. The key research challenges of the hydrodynamics of vegetated channels are highlighted.
Bibliography:SourceType-Scholarly Journals-1
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content type line 14
ISSN:0022-1686
1814-2079
DOI:10.1080/00221686.2012.696559