Laboratory investigation of the extreme shear stress in the scour holes downstream of dual grade-control structures with a PIV system

2014 ◽  
pp. 501-505
Author(s):  
J Lu ◽  
C Wen ◽  
S Lu
Keyword(s):  
Shear Stress ◽  
Laboratory Investigation ◽  
Control Structures ◽  
Grade Control ◽  
Scour Holes

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.

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

Mechanical and Chemical Stabilisation of Carbonatesand

2013 ◽  
Vol 742 ◽  
pp. 224-230
Author(s):  
Khaled Grine
Keyword(s):  
Shear Stress ◽  
Laboratory Investigation ◽  
Silica Sand ◽  
Carbonate Sand ◽  
Stress Strain ◽  
Volumetric Change ◽  
Isotropic Compression ◽  
Compressibility Characteristics

This paper describe a laboratory investigation into the effects of adding silica sand and/or cement on the behaviour of artificial carbonate sand under shear and compression. Drained shear and compressibility tests have been performed on artificial carbonate sand samples and artificial carbonate sand samples mixed with different proportion by weight of silica sand and/or cement in order to determine the shear stress-strain and compressibility characteristics of the mixed material.The results demonstrate that contraction during shear and compressibility during isotropic compression decrease as the fraction of silica sand and/or cement increases within the artificial carbonate sand.A positive volumetric change (dilation) during shear is more obvious with cemented samples. It also demonstrate how the addition of a combination of silica sand and cement produces the most effective improvement in terms of strength, stiffness, compressibility and crushing.

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