Discussion. Analytical Determination of the Discharge Characteristics of Broad-Crested Weirs Using Boundary Layer Theory.

Hall, G W; Kolupaila, Steponas; Rajaratnam, N.; Hom, M; Agnew, R. A.; Singer, Jill; Bretschneider, H; Wallis, R.A.; Ackers, Peter; Harrison, A J M; Addison, H; Allan, W.; Smith, John R.; Williams, Jonny; Zanker, K.; Engel, F. V. A.; Stains,

doi:10.1680/iicep.1964.10018

Cited by 11 publications

(21 citation statements)

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“…Govinda Rao and Muralidhar (1963) classified rectangular weirs in four categories based on the total energy head upstream of the weir and the crest length as follows: rectangular long-crested weirs, rectangular broad-crested weirs, rectangular short-crested weirs, and rectangular sharp-crested weirs. Hall (1962) applied the boundary layer theory and presented a new expression for the free-flow characteristics of broad-crested weirs with 90º upstream face slope. Singer (1964) reported that the discharge coefficient of broad crested weirs ( ) depends on weir height ( ) as well as crest length .…”

Section: Literature Reviewmentioning

confidence: 99%

Flow Characteristics of Rectangular Broad-Crested Weirs with Sloped Upstream Face

Goodarzi¹,

Frounchi²,

Shokri³

2012

Journal of Hydrology and Hydromechanics

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The hydraulic characteristics of flow over rectangular broad-crested weirs with varying upstream slopes were experimentally studied. A series of laboratory experiments was performed to investigate the effects of changing upstream slopes from 90º to 75º, 60º, 45º, 30º, 22.5º, 15º, and 10º on the flow surface pattern, discharge coefficient values, approach velocity profile and flow separation zone. In addition, a new mathematical relationship for water surface profile and a new correction factor to estimate discharge coefficient over weirs with various upstream slopes were introduced. The results showed decreasing upstream slopes from 90º to 10º leading to increasing discharge coefficient values and dissipation of the separation zone. Práca obsahuje výsledky experimentálneho štúdia prietoku vody cez pravouhlý priepad so širokou priepadovou hranou s rozdielnymi sklonmi návodného povrchu priepadu. Uskutočnili sme sériu laboratórnych pokusov s cieľom štúdia vplyvu rôznych sklonov návodného povrchu priepadu od 90°, 75°, 60°, 45°, 30°, 22,5°, 15°, až po 10° na tvar hladiny, hodnoty prietokového súčiniteľa, rýchlostné profily a na prúdenie v oblasti separácie. Okrem toho boli zistené nové matematické vzťahy na výpočet tvaru hladiny, ako aj nové korekčné faktory na určenie prietokových súčiniteľov cez priepad s rozdielnymi sklonmi ná-vodného povrchu. Z výsledkov vyplýva, že znižujúce sa sklony návodného povrchu priepadu od 90° po 10° vedú k zvýšeniu prietokového súčiniteľa a k disipácii oblasti separácie.KĽÚČOVÉ SLOVÁ: priepad širokou priepadovou hranou, sklon návodného povrchu, tvar povrchu hladiny, výtokový koeficient, korekčný faktor, oblasť separácie, profily rýchlosti prúdenia.

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Section: Literature Reviewmentioning

confidence: 99%

Flow Characteristics of Rectangular Broad-Crested Weirs with Sloped Upstream Face

Goodarzi¹,

Frounchi²,

Shokri³

2012

Journal of Hydrology and Hydromechanics

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“…Successful physical studies included BAZIN (1896), WOODBURN (1932), TISON (1950) and SERRE (1953). HALL (1962) and ISAACS (1981) It is the purpose of this contribution to document the free-surface profiles and pressure and velocity distributions on a horizontal broad-crested weir with rounded nose. New experiments were performed in a large size facility.…”

Section: Introductionmentioning

confidence: 99%

Free-Surface Profiles, Velocity and Pressure Distributions on a Broad-Crested Weir: A Physical Study

Felder

Chanson

2012

J. Irrig. Drain Eng.

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Basic experiments were conducted on a large-size broad-crested weir with a rounded corner. Detailed free-surface, velocity and pressure measurements were performed for a range of flow conditions. The results showed the rapid flow distribution at the upstream end of the weir, as well as next to the weir brink at large flow rates. The flow properties above the crest were analysed taking into account the non-uniform velocity and non-hydrostatic pressure distributions. Introducing some velocity and pressure correction coefficients, it is shown that critical flow conditions were achieved above the weir crest for 0.1 < x/L crest < 1. The velocity measurements highlighted a developing boundary layer. The data differed from the smooth turbulent boundary layer theory, although the present results were consistent with earlier studies. On average the boundary stress was about  o /(×g×H 1 ) ~ 0.0015 to 0.0025.

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“…Mos [13] analysed the flow separation at the upstream corner of square-edged broad-crested weirs numerically and experimentally. Hall [7] and Isaacs [10] studied the effects of developing boundary layer on the weir overflow. Ramamurthy, Tim and Rao [14] systematically studied the discharge characteristics of round-edged and square-edged weirs.…”

Section: Introductionmentioning

confidence: 99%

Experimental measurements of velocity and pressure distributions on a large broad-crested weir

Gonzalez

Chanson

2007

Flow Measurement and Instrumentation

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Basic experiments were conducted in a near full-scale broad-crested weir. Detailed velocity and pressure measurements were performed for two configurations. The results showed the rapid flow distribution at the upstream end of the weir, while an overhanging crest design may affect the flow field. The study showed further that large vortical structures might be observed immediately upstream of the weir and impact adversely on the overflow.

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Discussion. Analytical Determination of the Discharge Characteristics of Broad-Crested Weirs Using Boundary Layer Theory.

Cited by 11 publications

References 0 publications

Flow Characteristics of Rectangular Broad-Crested Weirs with Sloped Upstream Face

Flow Characteristics of Rectangular Broad-Crested Weirs with Sloped Upstream Face

Free-Surface Profiles, Velocity and Pressure Distributions on a Broad-Crested Weir: A Physical Study

Experimental measurements of velocity and pressure distributions on a large broad-crested weir

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