Accounting for Rough Bed Friction Factors of Mud Beds as a Result of Biological Activity in Erosion Experiments

AbstractThe 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 r...

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Bibliographic Details
Published in:Journal of hydraulic engineering (New York, N.Y.) N.Y.), 2012-11, Vol.138 (11), p.979-984
Main Authors: Guizien, Katell, Orvain, Francis, Duchêne, Jean-Claude, Le Hir, Pierre
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
Bacillariophyceae
Biodiversity and Ecology
Biological and medical sciences
Calibration
Ecotoxicology, biological effects of pollution
Environmental Engineering
Environmental Sciences
Erosion
Fluid flow
Friction factor
Fundamental and applied biological sciences. Psychology
Marine and brackish environment
Roughness
Sediments
Shear stress
Technical Note
Technical Notes
Upstream
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Summary:AbstractThe 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.
ISSN:0733-9429
1943-7900
DOI:10.1061/(ASCE)HY.1943-7900.0000627