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Calibration of FST‐hemispheres against bottom shear stress in a laboratory flume *
Author(s) -
STATZNER B.,
KOHMANN F.,
HILDREW A.G.
Publication year - 1991
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.1991.tb01731.x
Subject(s) - flume , shear stress , turbulence , shear (geology) , geology , pebble , geotechnical engineering , flow (mathematics) , mechanics , mathematics , physics , geomorphology , paleontology
SUMMARY.1 Fliesswasserstammtisch (FST)‐hemispheres of identical size but different densities were exposed on a horizontal plane on the pebble‐covered bottom of a laboratory flume at streaming to shooting, turbulent and fully developed flow. The heaviest hemisphere moved was used as an indicator of shear stress, a flow force acting on the flume bottom. 2 The relationship between shear stress and hemisphere density was practically the same for three different sets of hemispheres, namely one prototype set newly prepared for the calibrations, one prototype set intensively used in the field prior to calibrations, and one randomly selected new set bought commercially. 3 Shear stress ( y , dyn cm −2 ) was related to hemisphere density ( x , g cm −3 ) by y = x 2.85 ( n = 69; r 2 = 0.993). For lighter hemispheres this relationship was better explained by the linear model y = 7.32 x – 6.60 ( n = 35; r 2 =0.983).