IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Laboratory investigation on the hydrodynamic characterization of artificialgrass
Laboratory investigation on the hydrodynamic characterization of artificialgrass
Author : A.VARGAS-LUNA (1) (2), A. CROSATO (1) (3), L. COLLOT (4) & W.S.J. UIJTTEWAAL (1)
ABSTRACT
The morphological evolution of river systems is strongly influenced by the presence of vegetation. On vegetated beds,
velocity fields are spatially heterogeneous at different scales according to vegetation density and hydraulic conditions.
Plants affect velocity profiles that deviate from those commonly found in non-vegetated flows, changing the local
sediment transport rates and the morphodynamic trends. To simulate the effects of vegetation on hydrodynamics and
sediment transport, plants are often treated as uniform arrays of rigid cylinders characterized by diameter, height,
density and drag coefficient. Given the vast variety of plant shapes and considering that plants may be flexible, it is
important to define the key parameters that characterize plants in rigid-cylinder representations. In this work, artificial
grass is characterized in a laboratory setup considering emergent and submerged conditions, three densities, and two
sediment types. The same flow discharges are used in all the tests in order to be able to compare the cases. The results
show the effectiveness of a selected rigid-cylinder representation in reproducing the measured vegetation effects. The
results suggest a non-linear relationship between the total shear stress, the bed-shear stress and the drag exerted by
plants.
File Size : 528,547 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 20/08/2015
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