Evolution of scouring process downstream of grade-control structures under steady and unsteady flows

2012 ◽  
Vol 27 (19) ◽  
pp. 2699-2709 ◽  
Author(s):  
Jau-Yau Lu ◽  
Jian-Hao Hong ◽  
Kai-Po Chang ◽  
Tai-Fang Lu
Keyword(s):  
Unsteady Flows ◽  
Control Structures ◽  
Grade Control ◽  
Scouring Process ◽  
Steady And Unsteady Flows

scholarly journals Temporal and Spatial Flow Variations over a Movable Scour Hole Downstream of a Grade-Control Structure with a PIV System

Water ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 1002 ◽  
Author(s):  
Shi-Yan Lu ◽  
Jau-Yau Lu ◽  
Dong-Sin Shih
Keyword(s):  
Turbulent Flow ◽  
Diffusion Region ◽  
Control Structures ◽  
Intensity Measurements ◽  
Scour Hole ◽  
Sophisticated Equipment ◽  
Grade Control ◽  
Scour Holes ◽  
Scouring Process ◽  
Temporal And Spatial

Weirs or grade-control structures (GCSs) are frequently adopted to protect bridges or control riverbed degradation. Scour holes may develop downstream of these hydraulic structures. Laboratory experiments have been performed in this study, using sophisticated equipment and newly developed procedures. The purpose was to investigate important characteristics of the turbulent flow in the movable scour hole. The results of these experiments demonstrated the significance of instantaneous shear stress in the scouring process. The measured Reynolds stress can be fitted with the theoretical equation reasonably well. Furthermore, the results revealed that the normalized mean vertical velocity profiles in the diffusion region of the scour hole can be fitted with a Gaussian curve. An analysis of the turbulence intensity measurements showed that the turbulent flow is anisotropic in the scour hole. The turbulence intensities also decreased with time as the scour hole gradually approached equilibrium.

On nonlocal fractal laminar steady and unsteady flows

2021 ◽  
Vol 232 (4) ◽  
pp. 1413-1424
Author(s):  
Rami Ahmad El-Nabulsi
Keyword(s):  
Unsteady Flows ◽  
Steady And Unsteady Flows

scholarly journals Scour Downstream of Grade‐Control Structures

1991 ◽  
Vol 117 (5) ◽  
pp. 579-594 ◽  
Author(s):  
Noel E. Bormann ◽  
Pierre Y. Julien
Keyword(s):  
Control Structures ◽  
Grade Control

Equilibrium Scour Downstream of Three-Dimensional Grade-Control Structures

2012 ◽  
Vol 138 (2) ◽  
pp. 167-176 ◽  
Author(s):  
S. Michael Scurlock ◽  
Christopher I. Thornton ◽  
Steven R. Abt
Keyword(s):  
Three Dimensional ◽  
Control Structures ◽  
Grade Control

Effects of grade control structures on the macroinvertebrate assemblage of an agriculturally impacted stream

2008 ◽  
Vol 24 (2) ◽  
pp. 218-233 ◽  
Author(s):  
M. E. Litvan ◽  
T. W. Stewart ◽  
C. L. Pierce ◽  
C. J. Larson
Keyword(s):  
Control Structures ◽  
Macroinvertebrate Assemblage ◽  
Grade Control
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