FN Archimer Export Format PT J TI Accounting for Rough Bed Friction Factors of Mud Beds as a Result of Biological Activity in Erosion Experiments BT AF GUIZIEN, Katell ORVAIN, Francis DUCHENE, Jean-Claude LE HIR, Pierre AS 1:1;2:2;3:3;4:4; FF 1:;2:;3:;4:PDG-ODE-DYNECO; C1 Univ Paris 06, Observ Oceanol, LECOB, CNRS,FRE3350, F-66650 Banyuls Sur Mer, France. Univ Caen, Lab Physiol & Ecophysiol Mollusques Marins PE2M, F-14032 Caen, France. Univ Bordeaux, CNRS, UMR EPOC 5805, F-33405 Talence, France. IFREMER, Ctr Brest, F-29280 Plouzane, France. C2 UNIV PARIS 06, FRANCE UNIV CAEN, FRANCE UNIV BORDEAUX, FRANCE IFREMER, FRANCE SI BREST SE PDG-ODE-DYNECO IN WOS Ifremer jusqu'en 2018 copubli-france copubli-univ-france IF 1.28 TC 8 UR https://archimer.ifremer.fr/doc/00117/22807/20617.pdf LA English DT Article DE ;Bed roughness;Friction factor;Mud beds;Biological activity;Erosion experiments AB 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. PY 2012 PD NOV SO Journal Of Hydraulic Engineering-asce SN 0733-9429 PU Asce-amer Soc Civil Engineers VL 138 IS 11 UT 000312706800007 BP 979 EP 984 DI 10.1061/(ASCE)HY.1943-7900.0000627 ID 22807 ER EF