Search results for "Depth to sediment height ratio"

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Flow resistance in gravel-bed channels with large-scale roughness

2003

A previously published mixing length (ML) model for evaluating the Darcy–Weisbach friction factor for a large-scale roughness condition (depth to sediment height ratio ranging from 1 to 4) is briefly reviewed and modified (MML). Then the MML model and a modified drag (MD) model are experimentally tested using laboratory measurements carried out for gravel-bed channels and large-scale roughness condition. This analysis showed that the MML gives accurate estimates of the Darcy–Weisbach coefficient and for Froude number values greater than 0·5 the MML model coincides with the ML one. Testing of the MD model shows limited accuracy in estimating flow resistance. Finally, the MML and MD models are com…

Flow resistanceScale (ratio)Depth to sediment height ratioGeography Planning and DevelopmentLarge-scale roughnessSurface finishMechanicsScale factorsymbols.namesakeFlow resistanceDragGravel-bed channelEarth and Planetary Sciences (miscellaneous)ExponentFroude numbersymbolsSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliGeotechnical engineeringConstant (mathematics)Earth-Surface ProcessesMathematicsEarth Surface Processes and Landforms
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