Experimental study of near-wall turbulent characteristics in an open-channel with gravel bed using an acoustic Doppler velocimeter

2011 ◽  
Vol 52 (1) ◽  
pp. 85-94 ◽  
Author(s):  
X. Y. Wang ◽  
Q. Y. Yang ◽  
W. Z. Lu ◽  
X. K. Wang
Keyword(s):  
Experimental Study ◽  
Open Channel ◽  
Acoustic Doppler Velocimeter ◽  
Gravel Bed ◽  
Turbulent Characteristics ◽  
Near Wall

Experimental study of depth-limited open-channel flows over a gravel bed

2015 ◽  
Vol 30 (2) ◽  
pp. 160-166 ◽  
Author(s):  
Cheng Zeng ◽  
Chiwai Li ◽  
Hongwu Tang ◽  
Lingling Wang ◽  
Jingqiao Mao
Keyword(s):  
Experimental Study ◽  
Open Channel ◽  
Channel Flows ◽  
Open Channel Flows ◽  
Gravel Bed

scholarly journals An experimental study on open channel flows with moderate adverse pressure gradients

1995 ◽  
Vol 39 ◽  
pp. 391-396
Author(s):  
Kouki ONITSUKA ◽  
Masaru URA ◽  
Juichiro AKIYAMA ◽  
Sadakatsu MATSUOKA
Keyword(s):  
Experimental Study ◽  
Open Channel ◽  
Channel Flows ◽  
Pressure Gradients ◽  
Open Channel Flows

scholarly journals The Effect of Habitat Structure Boulder Spacing on Near-Bed Shear Stress and Turbulent Events in a Gravel Bed Channel

Water ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1423
Author(s):  
Amir Golpira ◽  
Fengbin Huang ◽  
Abul B.M. Baki
Keyword(s):  
Shear Stress ◽  
Habitat Structure ◽  
Open Channel ◽  
Reynolds Shear Stress ◽  
Three Dimensional ◽  
Quadrant Analysis ◽  
Bed Shear Stress ◽  
Gravel Bed ◽  
Restoration Practices ◽  
Ejections And Sweeps

This study experimentally investigated the effect of boulder spacing and boulder submergence ratio on the near-bed shear stress in a single array of boulders in a gravel bed open channel flume. An acoustic Doppler velocimeter (ADV) was used to measure the instantaneous three-dimensional velocity components. Four methods of estimating near-bed shear stress were compared. The results suggested a significant effect of boulder spacing and boulder submergence ratio on the near-bed shear stress estimations and their spatial distributions. It was found that at unsubmerged condition, the turbulent kinetic energy (TKE) and modified TKE methods can be used interchangeably to estimate the near-bed shear stress. At both submerged and unsubmerged conditions, the Reynolds method performed differently from the other point-methods. Moreover, a quadrant analysis was performed to examine the turbulent events and their contribution to the near-bed Reynolds shear stress with the effect of boulder spacing. Generally, the burst events (ejections and sweeps) were reduced in the presence of boulders. This study may improve the understanding of the effect of the boulder spacing and boulder submergence ratio on the near-bed shear stress estimations of stream restoration practices.

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