Stage-discharge relationship for triangular and curved-edge triangular weirs

Vatankhah, Ali R.; Khamisabadi, M.

doi:10.1016/j.flowmeasinst.2019.101609

Cited by 12 publications

(4 citation statements)

References 26 publications

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“…Hattab et al (2019) investigated the use of gauging TPWs with a triangular notch in confined conditions (2019). Vatankhah and Khamisabadi (2019) investigated the shape of the triangular notch and notches with curved extensions. Experiments with a 2.67° notch angle were carried out by Pospíšilík (2020).…”

Section: Current State Of Knowledgementioning

confidence: 99%

Discharge coefficient, effective head and limit head in the Kindsvater-Shen formula for small discharges measured by thin-plate weirs with a triangular notch

Pospíšilík

Zachoval

2023

Journal of Hydrology and Hydromechanics

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The paper deals with the determination of the discharge coefficient, effective head and newly the limit head in the Kindsvater-Shen formula for the determination of a relatively small discharge of clear water using a thin-plate weir with a triangular notch. The determination of the discharge coefficient, effective head and limit head is based on extensive experimental research and is verified by previous measurements by other authors. The experimental research was characterised by a large range of notch angles (from 5.25° to 91.17°), weir heights (from 0.00 m to 0.20 m), and water temperatures (from 15 °C to 45 °C), as well as a focus on relatively small heads (from 0.02 m to 0.18 m), which is where the strengths of the Kindsvater-Shen formula stand out. The experimental research supplemented existing knowledge about the overflow occurring with small heads and small weir notch angles. The newly determined dependencies in the Kindsvater-Shen formula extended its applicability to weirs with small notch angles and newly enabled the determination of the limit head, which restricts its applicability in the determination of small discharges.

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Section: Current State Of Knowledgementioning

confidence: 99%

Discharge coefficient, effective head and limit head in the Kindsvater-Shen formula for small discharges measured by thin-plate weirs with a triangular notch

Pospíšilík

Zachoval

2023

Journal of Hydrology and Hydromechanics

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“…Použitím tenkostěnných přelivů s trojúhelníkovými výřezy ve stísněných podmínkách se roku 2019 zabýval Hattab [70]. Tvarem trojúhelníkového výřezu a výřezy se zakřiveným rozšířením se roku 2019 zabýval Vatankhah [71]. Roku 2020 určil Vicena [72] minimální přepadovou výšku tenkostěnného přelivu s trojúhelníkovým výřezem.…”

Section: Literární Přehledunclassified

Analýza rozsahu prozkoumanosti přepadu přes tenkostěnné přelivy s trojúhelníkovým výřezem

Pospíšilík¹

2022

Juniorstav

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Za první významný experiment s přepadem přes tenkostěnný přeliv s trojúhelníkovým výřezem lze považovat Thomsonův z roku 1858. V návaznosti na Thomsonovo měření byla provedena řada experimentů především v první polovině 20. století. Vybrané experimenty pak shrnul roku 1981 Shen. Článek se zabývá shromážděním dostupných publikací k tématu přepadu přes tenkostěnné přelivy s trojúhelníkovým výřezem do roku 2021 a analýzou rozsahu použitých geometrických parametrů a vlastností kapalin, kterými byly úhel výřezu, měřená výška vztažená ke koruně přelivu "přepadová výška", výška přelivu a teplota použité vody. Klíčová slovaTenkostěnný přeliv, trojúhelníkový výřez, přepad.

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“…Field discharge measurements are also useful to verify if an irrigation system operates correctly. Weirs of different shapes are employed to measure discharge conveyed or to regulate the upstream water levels in irrigation channels [1][2][3] and have been extensively investigated in laboratory applications [2,[4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…To this aim, the concepts of vena contracta [19] and the measured discharge coefficient C d , less than the unit, are used [20]. Many authors [3,21,22] studied the discharge coefficient, which includes all the effects neglected in the derivation (viscosity, surface tension, velocity head in the approach channel, flow turbulence, non-uniform velocity profile, and streamline curvature due to weir contraction) of the stage-discharge equation.…”

Section: Introductionmentioning

confidence: 99%

New Stage–Discharge Relationship for Triangular Broad-Crested Weirs

Nicosia

Carollo

Stefano

et al. 2022

Water

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Simple hydraulic structures, such as weirs, allow measuring flow discharge by using the upstream flow depth and a stage–discharge relationship. In this relationship, a discharge coefficient is introduced to correct all the effects neglected in the derivation (viscosity, surface tension, velocity head in the approach channel, flow turbulence, non-uniform velocity profile, and streamline curvature due to weir contraction). In this paper, the dimensional analysis and the incomplete self-similarity theory are used to investigate the outflow process of triangular broad-crested weirs, characterized by different values of the ratio between crest height p and channel width B, and to theoretically deduce a new stage–discharge relationship. A new theoretical stage–discharge relationship is suggested for the free-flow condition, and it is tested using experimental data available in the literature for the hydraulic condition p/B > 0. The obtained stage–discharge equation, characterized by low errors in discharge estimate, is useful for laboratory and field investigations. Finally, specific analysis for the triangular broad-crested weirs with p/B > 0 was developed to modify the stage–discharge relationship obtained for the case p/B = 0. This specific stage–discharge relationship allows to reduce the errors, which are generally less than ±5%, in the estimate of discharge for triangular broad-crested weirs with p/B > 0 and is also applicable for the case p/B = 0.

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Stage-discharge relationship for triangular and curved-edge triangular weirs

Cited by 12 publications

References 26 publications

Discharge coefficient, effective head and limit head in the Kindsvater-Shen formula for small discharges measured by thin-plate weirs with a triangular notch

Discharge coefficient, effective head and limit head in the Kindsvater-Shen formula for small discharges measured by thin-plate weirs with a triangular notch

Analýza rozsahu prozkoumanosti přepadu přes tenkostěnné přelivy s trojúhelníkovým výřezem

New Stage–Discharge Relationship for Triangular Broad-Crested Weirs

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