Influence of Bed Roughness and Cross Section Geometry on Medium and Maximum Velocity Ratio in Open-Channel Flow

2016 ◽  
Vol 142 (1) ◽  
pp. 06015015 ◽  
Author(s):  
M. Greco ◽  
T. Moramarco
Keyword(s):  
Cross Section ◽  
Channel Flow ◽  
Open Channel ◽  
Velocity Ratio ◽  
Maximum Velocity ◽  
Open Channel Flow ◽  
Bed Roughness ◽  
Cross Section Geometry

Open Channel Flow with Varying Bed Roughness

1979 ◽  
Vol 105 (9) ◽  
pp. 1167-1183 ◽  
Author(s):  
Donald W. Knight ◽  
J. Alasdair Macdonald
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Bed Roughness

Discussion of “Open Channel Flow with Varying Bed Roughness”

1980 ◽  
Vol 106 (9) ◽  
pp. 1554-1554
Author(s):  
Peter R. Wormleaton ◽  
Panos Hadjipanos ◽  
John Allen
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Bed Roughness

scholarly journals Lateral bed-roughness variation in shallow open-channel flow with very low submergence

2019 ◽  
Vol 19 (5) ◽  
pp. 1339-1361 ◽  
Author(s):  
Yulia Akutina ◽  
Olivier Eiff ◽  
Frédéric Y. Moulin ◽  
Maxime Rouzes
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Bed Roughness

Hydraulics of steeppass fishways

1991 ◽  
Vol 18 (6) ◽  
pp. 1024-1032 ◽  
Author(s):  
N. Rajaratnam ◽  
C. Katopodis
Keyword(s):  
Experimental Study ◽  
Velocity Profile ◽  
Channel Flow ◽  
Flow Rate ◽  
Open Channel ◽  
Maximum Velocity ◽  
Open Channel Flow ◽  
Width Ratio ◽  
Hydraulic Design ◽  
Theoretical Considerations

This paper presents the results of an experimental study on the hydraulics of steeppass fishways. Using theoretical considerations and experimental observations, an expression has been developed that relates the flow rate, slope of the fishway, and depth of flow. It was also found that the characteristic (similarity) velocity profile found earlier, for smaller values of depth to width ratio,y0/b, with the maximum velocity near the bottom, changes to a rather symmetrical profile with the maximum velocity occurring somewhere near the mid-depth for larger values of y0/b. A correlation has also been found for the maximum velocity. This paper also includes some observations on the M-type backwater curves that would appear in the fishway when the tailwater depths exceed uniform flow depths. Key words: fishways, hydraulics, turbulent flow, open-channel flow, hydraulic design.

scholarly journals Effect of aspect ratio on higher order moments of velocity fluctuations in hydraulically rough open channel flow

2018 ◽  
Vol 40 ◽  
pp. 05045
Author(s):  
Minakshee Mahananda ◽  
Prashanth Reddy Hanmaiahgari
Keyword(s):  
Aspect Ratio ◽  
Order Statistics ◽  
Channel Flow ◽  
Open Channel ◽  
Outer Region ◽  
Open Channel Flow ◽  
Higher Order ◽  
Higher Order Statistics ◽  
Velocity Fluctuations ◽  
Bed Roughness

The effect of aspect ratio on the higher order statistics of velocity fluctuations in a hydraulically rough turbulent open channel flow is investigated. In this regard, an experiment was conducted in a rough bed narrow open channel flow of aspect ratio equal to three and the instantaneous flow velocities were measured using a Nortek Vectrino+ Acoustic Doppler Velocimeter. To understand the effect of aspect ratio, the results obtained from the present study are compared with the literature data of approximately same Reynolds number and bed roughness in a wide open channel flow for turbulence intensities and higher order statistics of velocity fluctuations. Comparison of turbulence intensities between Narrow OCF and Wide OCF shows occurrence of higher streamwise and vertical turbulence intensities in the outer region of Narrow OCF. The results of third order moments of velocity fluctuations are sensitive to aspect ratio in the outer region.

Closure to “Open Channel Flow with Varying Bed Roughness”

1981 ◽  
Vol 107 (5) ◽  
pp. 642-642
Author(s):  
Donald W. Knight ◽  
J. Alasdair Macdonald
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Bed Roughness
Sign in / Sign up

Export Citation Format

Share Document