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