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RESEARCH PRODUCT
ADV measurements of velocity distributions in a gravel-bed flume
Vito Ferrosubject
LogarithmGeography Planning and DevelopmentAcoustic doppler velocimeterSedimentMechanicsSurface finishFlumeGravel bedFriction factorFlow velocityEarth and Planetary Sciences (miscellaneous)Settore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliGeotechnical engineeringAcoustic Doppler velocimetryTheoretical distributionDivergence (statistics)GeologyEarth-Surface Processesdescription
Velocity measurements carried out by an acoustic doppler velocimeter (ADV) in a rectangular laboratory flume having a gravel bed are presented. The velocity profiles are measured in six verticals of the channel cross-section having an increasing distance (from 4 to 38.5 cm) from the flume wall. The experimental runs are carried out for five different bed arrangements, characterized by different concentrations of coarser elements, and for the two conditions of small- and large-scale roughness. For both hydraulic conditions, the velocity measurements are first used to test the applicability of the Dean profile and of the logarithmic profile corrected by a divergence function proposed in this paper. Then, for each value of the depth sediment ratio h/d84, the non-dimensional friction factor parameter is calculated by integration of the measured velocity distributions in the different verticals of the cross-section. Finally a semi-logarithmic flow resistance equation is empirically deduced. © 2003 John Wiley and Sons, Ltd.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-01-01 | Earth Surface Processes and Landforms |