scholarly journals Unsteady open-channel flows over rough bed with and without emergent rigid vegetation: A laboratory experiment

2020 ◽  
pp. 1527-1535
Author(s):  
J.R. Khuntia ◽  
S. Proust ◽  
K.K. Khatua
Keyword(s):  
Laboratory Experiment ◽  
Open Channel ◽  
Channel Flows ◽  
Open Channel Flows ◽  
Rigid Vegetation ◽  
Rough Bed

On the definition of the shear velocity in rough bed open channel flows

2006 ◽  
Author(s):  
C Manes ◽  
D Pokrajac ◽  
I McEwan ◽  
J Finnigan ◽  
V Nikora
Keyword(s):  
Open Channel ◽  
Shear Velocity ◽  
Channel Flows ◽  
Open Channel Flows ◽  
Rough Bed ◽  
Definition Of

scholarly journals Bed-Load Effects on Hydrodynamics of Rough-Bed Open-Channel Flows

2005 ◽  
Vol 131 (7) ◽  
pp. 576-585 ◽  
Author(s):  
Lorna Campbell ◽  
Ian McEwan ◽  
Vladimir Nikora ◽  
Dubravka Pokrajac ◽  
Michael Gallagher ◽  
...  
Keyword(s):  
Open Channel ◽  
Channel Flows ◽  
Bed Load ◽  
Open Channel Flows ◽  
Rough Bed ◽  
Load Effects

Effect of aspect ratio on developing and developed narrow open channel flow with rough bed

2018 ◽  
Vol 45 (9) ◽  
pp. 780-794 ◽  
Author(s):  
Minakshee Mahananda ◽  
Prashanth Reddy Hanmaiahgari ◽  
Ram Balachandar
Keyword(s):  
Kinetic Energy ◽  
Aspect Ratio ◽  
Channel Flow ◽  
Open Channel ◽  
Reynolds Shear Stress ◽  
Open Channel Flow ◽  
Flow Region ◽  
Channel Flows ◽  
Open Channel Flows ◽  
Rough Bed

This study attempts to unravel the effect of aspect ratio on the turbulence characteristics in developing and fully developed narrow open channel flows. In this regard, experiments were conducted in a rough bed open channel flow. Instantaneous 3D velocities were acquired using an acoustic Doppler velocimeter at various locations along the centerline of the flume. The variables of interest include the mean components of the flow velocity, turbulence intensity, wall normal Reynolds shear stress, correlation coefficient, turbulence kinetic energy, and anisotropy. A new correlation between the equivalent roughness and velocity shift from the smooth wall logarithmic equation as a function of aspect ratio is proposed. Aspect ratio was found to influence the velocity characteristics throughout the depth in the developing flow region, while the effects are confined to the outer layer for fully developed flows. New equations to describe the variation of turbulence intensities and turbulent kinetic energy are proposed for narrow open channel flows. Reynolds stress anisotropy analysis reveals that level of anisotropy in narrow open channel flow is less than in wide open channel flows. Finally, a linear regression model is proposed to predict flow development length in narrow open channel flows with a rough bed.

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