Bedload transport through emergent vegetation: current status and its future prospect

Vegetation present in the water streams, on the banks and in the floodplain areas largely affects the river hydraulics. Indeed, river vegetation significantly influences hydrodynamics, sediment transport, bedforms, and pollutant transport. Environmental management of rivers requires an understanding...

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Bibliographic Details
Published in:Environmental fluid mechanics (Dordrecht, Netherlands : 2001) Netherlands : 2001), 2023-06, Vol.23 (3), p.711-733
Main Authors: D’Ippolito, Antonino, Calomino, Francesco, Dey, Subhasish, Gaudio, Roberto, Penna, Nadia
Format: Article
Language:English
Subjects:
Bed forms
Bed load
Bed roughness
Bedforms
Bottom stress
Boundary layers
Channels
Classical Mechanics
Critical velocity
Earth and Environmental Science
Earth Sciences
Emergent aquatic plants
Emergent vegetation
Environmental management
Environmental Physics
Estimation
Floodplains
Flow resistance
Fluid flow
Hydraulics
Hydrodynamics
Hydrogeology
Hydrology/Water Resources
Kinetic energy
Movement
Oceanography
Pollution dispersion
Pollution transport
Review Article
River banks
River beds
Rivers
Sediment
Sediment transport
Sedimentary structures
Shear stress
Streambeds
Streams
Turbulence
Turbulence effects
Turbulent kinetic energy
Vegetation
Vegetation effects
Velocity
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Summary:Vegetation present in the water streams, on the banks and in the floodplain areas largely affects the river hydraulics. Indeed, river vegetation significantly influences hydrodynamics, sediment transport, bedforms, and pollutant transport. Environmental management of rivers requires an understanding of the various processes and predictive capabilities of models. In the past, many studies were conducted, especially in laboratory settings, in order to quantify flow resistance due to vegetation. It is only recently that the effects of vegetation on sediment transport came to the attention of researchers. In particular, both suspended and bedload transport were considered. This paper reviews recent works conducted on the effect of vegetation on incipient sediment motion and bedload transport. With regard to the incipient sediment motion, methods based on critical velocity, turbulence, vegetation drag, and velocity in the bed roughness boundary layer have been discussed. For bedload transport, methods based on bed shear stress, turbulent kinetic energy, a revisiting of classical formulas for estimating bedload transport in non-vegetated channels, and estimation from erosion around a single vegetation stem are analyzed. Finally, indications on further research and new development are provided. Article Highlights Incipient sediment motion in vegetated channels is different from that in bare channels New models for the estimation of sediment transport in vegetated channels consider turbulence effects The presence of vegetation in rivers contributes in promoting the stability of the streambed
ISSN:1567-7419
1573-1510
DOI:10.1007/s10652-023-09918-0