Clear-water scour at a side-weir intersection along the bend

2005 ◽  
Vol 54 (5) ◽  
pp. 553-569 ◽  
Author(s):  
Hayrullah Aǵaçcioǵlu ◽  
Fevzi Önen
Keyword(s):  
Clear Water ◽  
Side Weir

Scour at a side-weir intersection located on an alluvial river

2007 ◽  
Vol 38 (2) ◽  
pp. 165-176 ◽  
Author(s):  
Fevzi Önen ◽  
Hayrullah Agaçcioglu
Keyword(s):  
Flow Velocity ◽  
Clear Water ◽  
Side Weir ◽  
Alluvial River ◽  
Sediment Size ◽  
Maximum Value ◽  
Water Head ◽  
Sand Bar ◽  
Side Weirs ◽  
Shear Stress Field

An experimental investigation of the equilibrium depth of local scour around side-weirs located on an alluvial river is presented in this paper. A sand bar in the middle of the channel and a scour hole close to the weir side is formed because of changes in shear stress field and velocity at the downstream end of the side weir. The depth of clear-water scour increases by time and approaches the equilibrium state asymptotically depending on approach flow velocity. The equilibrium depth of scour increases by the increase of the dimensionless parameters of approach flow velocity, water head ratio, side-weir length and sediment size. Although there is no scour for the dimensionless approach flow velocity less than 0.45, it increases almost linearly with the dimensionless approach flow velocity and the maximum value of scour depth occurs when it is equal to 1.0.

Clear water, blue skies

1997 ◽  
Author(s):  
Todd M. Johnson ◽  
Feng Liu ◽  
Richard Newfarmer
Keyword(s):  
Clear Water

The influence of currents on circular secondary clarifier performance and design

1996 ◽  
Vol 34 (3-4) ◽  
pp. 405-412 ◽  
Author(s):  
Andrea Deininger ◽  
Frank W. Günthert ◽  
Peter A. Wilderer
Keyword(s):  
Wastewater Treatment ◽  
Density Currents ◽  
Clear Water ◽  
Performance Measurements ◽  
Design Procedures ◽  
Secondary Clarifier ◽  
Current Design ◽  
Hydraulic Load ◽  
Novel Design ◽  
Wastewater Treatment Systems

Density currents in the deeper zones of clarifiers and currents in the clear water zone have a significant influence on clarifier performance. Measurements of flow velocity profiles were conducted in full-scale horizontally flown circular secondary clarifiers. Relations between the hydraulic load and the development of density currents could be detected. Those patterns are not taken into account in current design procedures. Stationary design approaches are mainly based on the overflow rate. Novel design methods based on the dynamic behavior of flow and density distribution in clarifiers are needed in order to improve the efficacy of wastewater treatment systems.

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