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Measuring bed shear stress along vegetated river beds using FST-hemispheres

Bockelmann-Evans, Bettina Nicole, Davies, R. and Falconer, Roger Alexander 2008. Measuring bed shear stress along vegetated river beds using FST-hemispheres. Journal of Environmental Management 88 (4) , pp. 627-637. 10.1016/j.jenvman.2007.03.044

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Abstract

The measurement of the bed shear stress along vegetated river beds is essential for accurately predicting the water level, velocity and solute and sediment transport fluxes in computational hydroenvironmental models. Details are given herein of an experimental and theoretical study to determine the bed boundary shear stress along vegetated river beds introducing a novel field measuring method, namely the FliessWasserStammtisch (FST)-hemispheres. Although investigations have been conducted previously for sedimentary channels using the FST-hemispheres, this preliminary study is thought to be the first time that such hemispheres have been used to investigate the bed shear stresses in vegetated channels. FST-hemispheres were first developed by Statzner and Müller [1989. Standard hemispheres as indicators of flow characteristics in lotic benthos research. Freshwater Biology 21, 445-459] to act as an integrated indicator of the gross hydrodynamic stresses present near the bed. Test and validation data were found to be at least of the same order of magnitude for the stresses predicted from literature for sedimentary channels, with this study establishing the commencement of a database of calibrated FST-hemisphere laboratory data for vegetated channel beds. In a series of experiments, depths ranging from 0.1 to 0.28 m were considered, equating directly to comparable conditions in small rivers or streams. The results of this study provide a basis for enabling the FST-hemispheres to be used to evaluate the boundary shear stress for a wider range of applications in the future, including vegetated river beds.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Uncontrolled Keywords: FST-hemispheres; Vegetated river beds; Open channel flow; Bed shear; River restoration; Ecohydraulics; Hydrodynamics models
Publisher: Elsevier
ISSN: 0301-4797
Last Modified: 04 Jun 2017 01:43
URI: http://orca.cf.ac.uk/id/eprint/1980

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