Search results for " Flow velocity profile"

showing 3 items of 3 documents

Flow resistance law under suspended sediment laden conditions

2020

Abstract The uniform flow resistance equation, in the form due to Manning or Darcy-Weisbach, is widely applied to establish the stage-discharge relationship of a river cross-section. The application of this equation, namely the slope-area method, allows to indirectly measure the corresponding river discharge by measurements of bed slope, water level, cross-section area, wetted perimeter and an estimate of channel roughness. In this paper, a recently deduced flow resistance equation for open channel flow was tested during conditions of suspended sediment-laden flow. First, the flow resistance equation was determined by dimensional analysis and by applying the condition of incomplete self-sim…

Materials science0207 environmental engineeringSediment02 engineering and technologyMechanicsDimensional analysis Flow resistance Flow velocity profile Self-similarity Suspended-load01 natural sciencesComputer Science ApplicationsOpen-channel flow010309 opticssymbols.namesakeWetted perimeterFlow conditionsFlow velocityFlow (mathematics)Modeling and Simulation0103 physical sciencesFroude numbersymbolsSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliPotential flowElectrical and Electronic Engineering020701 environmental engineeringInstrumentationFlow Measurement and Instrumentation
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Entropic approach to estimate the mean flow velocity: experimental investigation in laboratory flumes

2015

The paper deals with the linear entropic relationship between the maximum velocity, u max , and the mean flow velocity, u m , through a dimensionless parameter Φ(M), in open-channel flow. The analysis is conducted with the aid of experimental data collected in straight laboratory flumes under different bed and side-walls roughness conditions. In particular, rough/vegetated beds and smooth/rough side-walls conditions have been investigated. The results show that, in the investigated conditions (with exception of low-submergence vegetated bed—h/k v  < 2), Φ(M) can be assumed equal to a value that is very close to that found in natural channels. This demonstrates that Φ(M) is able to implicitl…

Physics::Fluid DynamicsFlow resistanceHydrogeologyEnvironmental ChemistryThermodynamicsGeometrySurface finishMean flow velocityFlow discharge entropy flow velocity profile experimental dataSettore ICAR/01 - IdraulicaWater Science and TechnologyDimensionless quantityMathematicsEnvironmental Fluid Mechanics
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Effects of Boulder Arrangement on Flow Resistance Due to Macro-Scale Bed Roughness

2023

Flow resistance in gravel-bed channels is not only affected by the shape and size of the roughness elements, but also by their arrangement on the channel bed surface (position to flow streamlines, spacing between elements, and their protrusion from the channel bed). Many investigations proved that open channel flow resistance can be obtained by integrating the power velocity profile. For a macro-scale roughness condition, this study aims to investigate the effect of different boulder arrangements on flow resistance. First, for each arrangement, the equation relating &Gamma; function of the power velocity profile, the Froude number, and the channel slope was calibrated using available measur…

flow velocity profileself-similarityflow resistance; gravel bed; boulder arrangement; dimensional analysis; flow velocity profile; self-similaritydimensional analysiGeography Planning and DevelopmentSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-Forestaliboulder arrangementAquatic Scienceflow resistanceBiochemistrygravel bedWater Science and TechnologyWater; Volume 15; Issue 2; Pages: 349
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