Discharge Coefficient of a Two-Rectangle Compound Weir combined with a Semicircular Gate beneath it under Various Hydraulic and Geometric Conditions

Authors

  • Majed O. A. Alsaydalani Civil Engineering Department, Umm Al Qura University, Saudi Arabia
Volume: 14 | Issue: 1 | Pages: 12587-12594 | February 2024 | https://doi.org/10.48084/etasr.6605

Abstract

Two-component composite hydraulic structures are commonly employed in irrigation systems. The first component, responsible for managing the overflow, is represented by a weir consisting of two rectangles. The second component, responsible for regulating the underflow, is represented by a semicircular gate. Both components are essential for measuring, directing, and controlling the flow. In this study, we experimentally investigated the flow through a combined two-rectangle sharp-crested weir with a semicircular gate placed across the channel as a control structure. The upper rectangle of the weir has a width of 20 cm, while the lower rectangle has varying widths (W2) of 5, 7, and 9 cm and depths (z) of 6, 9, and 11 cm. Additionally, three different values were considered for the gate diameter (d), namely 8, 12, and 15 cm. These dimensions were tested interchangeably, including a weir without a gate (d = 0), under different water head conditions. The results indicate that the discharge passing through the combined structure of the two rectangles and the gate is significantly affected by the weir and gate dimensions. After analyzing the data, empirical formulas were developed to predict the discharge coefficient (Cd) of the combined structure. It is important to note that the analysis and results presented in this study are limited to the range of data that were tested.

Keywords:

combined weir, semicircular gates, discharge coefficient, combined structure, open channels, discharge measurement

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References

S. S. Ibrahim, R. A. Jafer, and B. M. A. S. Ali, "An Experimental Study of a Combined Oblique Cylindrical Weir and Gate Structure," Engineering, Technology & Applied Science Research, vol. 13, no. 2, pp. 10483–10488, Apr. 2023.

F. Rooniyan, "The Effect of Confluence Angle on the Flow Pattern at a Rectangular Open Channel," Engineering, Technology & Applied Science Research, vol. 4, no. 1, pp. 576–580, Feb. 2014.

A. S. Kote and P. B. Nangare, "Hydraulic Model Investigation on Stepped Spillway’s Plain and Slotted Roller Bucket," Engineering, Technology & Applied Science Research, vol. 9, no. 4, pp. 4419–4422, Aug. 2019.

S. M. Kori, A. A. Mahessar, M. Channa, A. A. Memon, and A. R. Kori, "Study of Flow Characteristics Over a Rounded Edge Drop Structure in Open Channel," Engineering, Technology & Applied Science Research, vol. 9, no. 3, pp. 4136–4139, Jun. 2019.

F. Granata, F. Di Nunno, R. Gargano, G. de Marinis, "Equivalent Discharge Coefficient of Side Weirs in Circular Channel—A Lazy Machine Learning Approach," Water, vol. 11, no.11, 2019, Art. no. 2406.

S. Salehi and A. H. Azimi, "Discharge Characteristics of Weir-Orifice and Weir-Gate Structures," Journal of Irrigation and Drainage Engineering, vol. 145, no. 11, Nov. 2019, Art. no. 04019025.

M. G. Bos, Ed., Discharge Measurement Structures. Wageningen, The Netherlands: International Institute for Land Reclamation and Improvement, 1989.

S. Emami, J. Parsa, H. Emami, A. Abbaspour, "An ISaDE algorithm combined with support vector regression for estimating discharge coefficient of W-planform weirs," Water Supply, vol. 21, no.7, pp. 3459–3476, 2021.

A. B. Altan-Sakarya, M. A. Kokpinar, and A. Duru, "Numerical modelling of contracted sharp-crested weirs and combined weir and gate systems," Irrigation and Drainage, vol. 69, no. 4, pp. 854–864, 2020.

P. Ackers, W. R. White, J. A. Perkins, A. J. M. Harrison, Weirs and Flumes for Flow Measurement, New York, NY, USA: Wiley, 1978.

A. Alhamid, D. Husain, and A. Negm, "Discharge equation for simultaneous flow over rectangular weirs and below inverted triangular weirs," Arab Gulf Journal of Scientific Research, vol. 14, no. 3, pp. 595–607, Dec. 1996.

N. Rajaratnam and K. Subramanya, "Flow Equation for the Sluice Gate," Journal of the Irrigation and Drainage Division, vol. 93, no. 3, pp. 167–186, Sep. 1967.

A. Zahiri, H. Md. Azamathulla, and S. Bagheri, "Discharge coefficient for compound sharp crested side weirs in subcritical flow conditions," Journal of Hydrology, vol. 480, pp. 162–166, Feb. 2013.

S. A. Sarhan and S. A. Jalil, "Analysis of Simulation Outputs for the Mutual Effect of Flow in Weir and Gate System," Journal of University of Babylon for Engineering Sciences, vol. 26, no. 6, pp. 48–59, Apr. 2018.

M. Muhammad and S. Abdullahi, "Experimental Study of Flow over Sharp Crested Rectangular-Triangular Weir Models," in Nigeria Engineering Conference Proceedings, Zaria - Nigeria, Jan. 2014, pp. 34–45.

M. Piratheepan, N. E. F. Winston, and K. P. P. Pathirana, "Discharge Measurements in Open Channels using Compound Sharp-Crested Weirs," vol. 40, no. 3, pp. 31-38, Jul. 2007.

H. A. Hayawi, A. A. Yahia, G. A. Hayawi, "Free combined flow over a triangular weir and under rectangular gate," Damascus University Journal, vol. 24, no. 1, pp. 9–22, 2008.

A.-A. M. Negm, A. M. Al-Brahim, and A. A. Alhamid, "Combined-free flow over weirs and below gates," Journal of Hydraulic Research, vol. 40, no. 3, pp. 359–365, May 2002.

A. A. Alhamid, A.-A. M. Negm, and A. M. Al-Brahim, "Discharge Equation for Proposed Self-cleaning Device," Journal of King Saud University - Engineering Sciences, vol. 9, no. 1, pp. 13–23, Jan. 1997.

S. I. Khassaf and M. Habeeb, "Experimental Investigation for Flow Through Combined Trapezoidal Weir and Rectangular Gate," International Journal of Scientific & Engineering Research, vol. 5, no. 4, pp. 809–814, 2014.

A. A. G. Alniami, D. G. A. M. Hayawi, and H. A. M. Hayawi, "Coefficient Of Discharge For A Combined Hydraulic Measuring Device," Al-Rafidain Engineering Journal, vol. 17, no. 6, pp. 92–100, Dec. 2009.

J. M. Samani and M. Mazaheri, "Combined Flow over Weir and under Gate," Journal of Hydraulic Engineering, vol. 135, no. 3, pp. 224–227, Mar. 2009.

B. Balouchi and G. Rakhshandehroo, "Using Physical and Soft Computing Models to Evaluate Discharge Coefficient for Combined Weir–Gate Structures Under Free Flow Conditions," Iranian Journal of Science and Technology, Transactions of Civil Engineering, vol. 42, no. 4, pp. 427–438, Dec. 2018.

M. A. R. Eltoukhy, F. S. Abdelhaleem, T. H. Nasralla, S. Shaban, "Effect of Compound Weir and below Circular Gate Geometric Characteristics on its Discharge Coefficient," International Journal of Scientific & Engineering Research, Vol. vol. 11, no. 10, pp. 1115–1130, Oct. 2020.

C. E. Kindsvater and R. W. Carter, "Discharge Characteristics of Rectangular Thin-Plate Weirs," Transactions of the American Society of Civil Engineers, vol. 124, no. 1, pp. 772–801, Jan. 1959.

H. R. Henry, "Discussion of Diffusion of Submerged Jets," Transactions of ASCE, vol. 115, no. 1, pp. 687–694, Jan. 1950.

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[1]
Alsaydalani, M.O.A. 2024. Discharge Coefficient of a Two-Rectangle Compound Weir combined with a Semicircular Gate beneath it under Various Hydraulic and Geometric Conditions. Engineering, Technology & Applied Science Research. 14, 1 (Feb. 2024), 12587–12594. DOI:https://doi.org/10.48084/etasr.6605.

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