TY - JOUR T1 - Accounting for Rough Bed Friction Factors of Mud Beds as a Result of Biological Activity in Erosion Experiments A1 - Guizien,Katell A1 - Orvain,Francis A1 - Duchene,Jean-Claude A1 - Le Hir,Pierre AD - Univ Paris 06, Observ Oceanol, LECOB, CNRS,FRE3350, F-66650 Banyuls Sur Mer, France. AD - Univ Caen, Lab Physiol & Ecophysiol Mollusques Marins PE2M, F-14032 Caen, France. AD - Univ Bordeaux, CNRS, UMR EPOC 5805, F-33405 Talence, France. AD - IFREMER, Ctr Brest, F-29280 Plouzane, France. UR - https://doi.org/10.1061/(ASCE)HY.1943-7900.0000627 DO - 10.1061/(ASCE)HY.1943-7900.0000627 KW - Bed roughness KW - Friction factor KW - Mud beds KW - Biological activity KW - Erosion experiments N2 - 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. Y1 - 2012/11 PB - Asce-amer Soc Civil Engineers JF - Journal Of Hydraulic Engineering-asce SN - 0733-9429 VL - 138 IS - 11 SP - 979 EP - 984 ID - 22807 ER -