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Accounting for Rough Bed Friction Factors of Mud Beds as a Result of Biological Activity in Erosion Experiments
Provedor de dados: 5
Autores: Guizien, Katell; Orvain, Francis; Duchene, Jean-claude; Le Hir, Pierre.
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...
Tipo: Text
Palavras-chave: Bed roughness; Friction factor; Mud beds; Biological activity; Erosion experiments.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00117/22807/20617.pdf