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 : 34th Congress - Brisbane (2011) : THEME 5: Environmental Hydraulics and Hydrology : Vegetative drag in natural, foliated plant stands
Vegetative drag in natural, foliated plant stands
Author : K. Västilä1, J. Järvelä1, J. Aberle2 and T. Schoneboom2
Reliable estimation of vegetative flow resistance requires basing the estimates on physically sound and readily measurable plant properties. This paper investigates the relationship between drag and physical properties of natural, foliated Black poplars. Drag forces exerted on poplars in an array were measured simultaneously using up to ten force sensors in a laboratory flume. Frontal projected area was photographed under flow action. Leaves contributed almost 90% to the total drag. The onesided leaf area (AL) and the leaf area to the stem area ratio (AL/AS) influenced the detected variability in the drag force. The poplars had a higher AL/AS ratio and thus a greater ability to reconfiguration and drag reduction than previously reported for other species. The findings supported the hypothesis that such objectively defined and readily measurable reference area definitions could be used in estimating friction factors for foliated vegetation.
File Size : 502,782 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 5: Environmental Hydraulics and Hydrology
Date Published : 01/07/2011
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