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 : 35th IAHR Congress - Chengdu (2013) : THEME 9 - SPECIAL SEMINARS : Flow-Plant Interactions at a Patch Scale: A Field Study Using a Stereoscopic PIV System
Flow-Plant Interactions at a Patch Scale: A Field Study Using a Stereoscopic PIV System
Author : Stuart M. Cameron, Vladimir I. Nikora, Ismail Albayrak, Oliver Miler, Mark Stewart and Fabio Siniscalchi
A stereoscopic particle image velocimetry (PIV) system for use in shallow rivers was de- veloped and deployed to study the interactions between turbulent flow and a Ranunculus penicillatus plant patch in its native environment. Statistical moments of the velocity field were calculated utilising a new method of reducing the contribution of measurement noise, based on the measurement redundancy inherent to the stereoscopic PIV method. The data reveal that the wake of the plant patch was dominated by the presence of a free shear layer induced by the plant drag. Plant motion, estimated from the PIV im- ages, was characterised by travelling waves that propagate along the plant with a velocity nearly equal to the local mean velocity, indicating a direct coupling between turbulence and the plant motion. The char- acteristic frequency of the plant velocity fluctuations (~1Hz) suggests that the plant motion is dominated by large eddies with dimensions comparable to the flow depth or plant length. Plant and fluid velocity fluctuations were, in contrast, found to be strongly correlated only over a narrow elevation range above the top of the plant, supporting a conjecture that the shear layer turbulence is a key contributor to the plant motion. This talk is devoted to the memory of Professor Stephen E. Coleman ? long-term friend and col- laborator.
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File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 20/07/2016
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