Mathematical Description of Turbulent Flows
The mathematical description of uniform density and thermally stratified flows in terms of space averages is reviewed. The governing equations are presented and the use of alternative...

Calculation of Secondary Currents in Channel Flow
A model is presented for calculating the flow in channels with turbulence-driven secondary motion, with an emphasis on open channel flow. Algebraic expressions are derived for the Reynolds...

Separation Angle Effect on Vortex Shedding Frequency
Vortex shedding frequencies were measured for a number of two-dimensional bluff bodies whose boundary layers separation angles ranged from 0°-90° to the oncoming flow. Strouhal numbers...

Vertical Turbulent Diffusion in Air-Driven Water Flows
Turbulence intensities and Reynolds stresses produced in a water channel by an air flow over the surface have been measured. An expression for the vertical eddy diffusion coefficient is...

Bed Material Sorting in Pools and Riffles
When rivers flow in a series of riffles and pools during periods of low flow, bed material sizes change from coarser to finer in the riffle-pool sequence. The Froude Number also changes...

Antecedent Moisture Condition Probabilities
The problem of selecting an appropriately conservative Antecedent Moisture Condition (AMC) when using the Soil Conservation Service curve number method or the Illinois Urban program for...

Unstable Turbulent Flow in Open Channels
Controversy on the determination of the friction factor, f, for turbulent flow in open channels of rectangular cross section has existed among previous investigators. A number of them...

Separated Flow Through Large Sudden Expansions
Flow patterns for large, sudden expansions have been obtained experimentally. The experimental studies reveal that flow patterns for large expansions are highly asymmetric and unsteady....

Minimum Specific Energy in Compound Open Channel
A compound-channel Froude number is derived to reflect correctly the occurrence of minimum specific energy in open channels with overbank flow. The limitations of conventional Froude-number...

Forces Acting on Floc and Strength of Floc
A theoretical and experimental investigation was attempted to determine floc strength quantitatively. Some formulas were presented to evaluate the hydrodynamical forces acting on a suspended...

Streamwise Oscillations of Cylinders
Slender structures, such as marine piles, have been observed to experience oscillations in a streamwise direction when exposed to an external flow under appropriate circumstances. This...

Parametric Study of Flood Wave Propagation
A parametric study of the flood wave propagation problem is made, based on numerical solution of the nondimensionalized unsteady flow equations of open channels. The propagation of a sinusoidal...

Pressure Scale Effects on Shape Drag in Conduit
While testing cylinders in closed conduit flow, it was found that the drag coefficient varied with pressure at a constant Reynolds number. The conditions at which this phenomenon occurs...

Cavitation Induced by Turbulence in Stilling Basin
It is shown by simple arguments that is stilling basins, intense turbulence of flows could produce conditions favorable to cavitation. A free hydraulic jump occurring in a stilling basin...

Curve-Number Procedure as Infiltration Method
The soil conservation Service (SCS) curve-number procedure is commonly used to determine rainfall excess. The advantage of this method is that the parameters in the relation are the soil...

Hydraulic Design of Flow Distribution Channels
A method to analyze flow distribution over side weirs in a flow distribution channel has been presented. It is found that the discharge coefficient for individual side weirs is not constant...

Runoff Synthesis Using Landsat and SCS Model
The land cover requirements of the Soil Conservation Service (SCS) model used to develop volume of runoff for hydrograph synthesis in suburban areas were modified to be compatible with...

Drag of Yawed Pile Groups at Low Reynolds Numbers
The hydrodynamic drag on square arrays of model cylindrical piles in the Reynolds number range of 250 to 750 is shown to be a function of the angle of yaw of the incident flow and is also...

Experiments on Arrested Saline Wedge
Experimental results are presented which show that the onset of interfacial wave breaking can be expressed by a stability parameter which is a function of the interfacial densimetric Froude...

Force on Sill of Forced Jump
The mean force on a continuous sill in a forced hydraulic jump has been measured directly by a transducer for a wide range of experimental conditions. Four sills of heights expressed as...

 

 

 

 

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