Accounting for Rough Bed Friction Factors of Mud Beds as a Result of Biological Activity in Erosion Experiments
Publication: Journal of Hydraulic Engineering
Volume 138, Issue 11
Abstract
The average bed shear stress and bed friction factor of samples with any roughness was derived from the head loss between upstream and downstream of a test section in an erosion tunnel. The method was validated in both hydraulically smooth (plexiglass; Reynolds number less than 25,000) and rough regimes (calibrated particles with known roughness). As a first step toward using this method on natural sediment, this method was tested with experimental mesocosms assembled from field collected materials (sieved sediments; diatoms). Bed shear stress measurement precision was high enough in the experiments to detect a positive significant relationship between bed friction factor and core roughness. The observed bed friction factor increase could be related to diatom growth but not to diatoms biomass.
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Acknowledgments
This work was supported by the French ANR (National Research Agency) through the VASIREMI project “Trophic significance of microbial biofilms in tidal flats” (contract ANR-06-BLAN-0393-01). The assistance of Caroline Nérot for the mesocosms experiments is gratefully acknowledged. The authors also thank Jennifer Coston-Guarini and Ian Salter for language correction.
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Published In
Journal of Hydraulic Engineering
Volume 138 • Issue 11 • November 2012
Pages: 979 - 984
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Jan 14, 2011
Accepted: May 11, 2012
Published online: May 14, 2012
Published in print: Nov 1, 2012
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