Volume 26, Issue 1 (7-2007)
2007, 26(1): 13-25 |
Back to browse issues page
Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:
H. R. Sheibani and H. Bayyat. Velocity Profile and Reynolds Shear Stress in Overflow Gabion Dam Crest. Computational Methods in Engineering 2007; 26 (1) :13-25
URL: http://jcme.iut.ac.ir/article-1-404-en.html
URL: http://jcme.iut.ac.ir/article-1-404-en.html
Abstract: (4143 Views)
A physical model of gabion overflow dams was studied to determine the velocity profile and Reynolds shear stress. Physical tests were done under two different conditions of dam crest, overflow dams with impermeable and with permeable crests. Instantaneous velocity components over dam crest were measured by an ADV (Acoustic Doppler Velocimeter) instrument. This instrument is capable of measuring instantaneous velocity components with frequencies up to 25 Hz. Average velocity components and bed shear stress were extracted from ADV measurements. The results of this research show the effect of crest permeability on velocity and Reynolds shear stress. The magnitude of Reynolds shear stresses, horizontal velocity components, and absolute value of vertical velocity components under the permeable scenario are bigger than those of the impermeable scenario. Velocity distribution over the dam crest is different from the universal logarithmic profile.
