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

Type Publication
Date 2012-11
Language English
Copyright 2012 American Society of Civil Engineers.
Author(s) Guizien Katell1, Orvain Francis2, Duchene Jean-Claude3, Le Hir Pierre4
Affiliation(s) 1 : Univ Paris 06, Observ Oceanol, LECOB, CNRS,FRE3350, F-66650 Banyuls Sur Mer, France.
2 : Univ Caen, Lab Physiol & Ecophysiol Mollusques Marins PE2M, F-14032 Caen, France.
3 : Univ Bordeaux, CNRS, UMR EPOC 5805, F-33405 Talence, France.
4 : IFREMER, Ctr Brest, F-29280 Plouzane, France.
Source Journal Of Hydraulic Engineering-asce (0733-9429) (Asce-amer Soc Civil Engineers), 2012-11 , Vol. 138 , N. 11 , P. 979-984
DOI 10.1061/(ASCE)HY.1943-7900.0000627
WOS© Times Cited 6
Keyword(s) Bed roughness, Friction factor, Mud beds, Biological activity, Erosion experiments
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. DOI: 10.1061/(ASCE)HY.1943-7900.0000627. (C) 2012 American Society of Civil Engineers.
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