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 : Water engineering : Vegetation patch effects on flow resistance at channel scale
Vegetation patch effects on flow resistance at channel scale
Thanks to a specific experimental design in a controlled channel, this paper aimed at quantifying how patches of four
different ditches plant species affect integrated flow resistance parameters, the Manning coefficient. These plants,
frequently encountered in the farmland ditches and irrigation channels of the south of France, were selected according to
a large range of hydrophilic requirements, flexibility and branching complexity related to the plant blockage factor. Eight
different spatial patches (regular, random, lateral or central patches) of each plant with crescent or similar plant densities
were implanted at the bottom of a controlled channel where the water levels and water velocities were measured for three
different discharges in steady and unsteady flow conditions. Resistance parameters (Manning parameters) were then
estimated from the total head-loss, or from flow propagation velocity in the channel thanks to inversion of an
hydrodynamic model. These experiments allow us to test the significance effect of channel vegetation patches and
densities on flow resistance parameters at the reach scale.
File Size : 908,161 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 17/08/2015
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