An Experimental Study of a Combined Oblique Cylindrical Weir and Gate Structure

Authors

  • Safa S. Ibrahim Chemistry Department, Faculty of Sciences, University of Zakho, Iraq
  • Rondik A. Jafer Water Resources Engineering Department, Faculty of Engineering, University of Duhok, Iraq
  • Binahi M. A. Said Ali Water Resources Engineering Department, College of Engineering, Salahaddin University, Iraq
Volume: 13 | Issue: 2 | Pages: 10483-10488 | April 2023 | https://doi.org/10.48084/etasr.5646

Abstract

In the present study, the effects of different oblique angles and diameters on the cylindrical weir and below a gate as a combined device have been studied experimentally. For this purpose, sixteen models of combined cylindrical weir-gate structures have been tested in a laboratory flume. These models had four different oblique angles α (300, 450, 600, and 900). For each angle, the diameter of cylindrical weir-gate changed four times (4, 7.3, 9, and 11cm). The results of all models indicate that the theoretical discharge (Qth) is inversely proportional to the ratio of diameter to height (D/h) and length to height (L/h). As the diameter increases and oblique angles decrease, the actual discharge (Qact) increases. A general expression was established linking Qth/g1/2h5/2 and the discharge coefficient Cd with D/h, L/h, and alfa. The discharge coefficient ranged from 0.55 to 0.99 for various oblique angles and decreased as the angle increased. A strong correlation was observed between the estimated and the calculated values.

Keywords:

combined flow, cylindrical weir, gate, discharge coefficient, theoretical discharge

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References

S. A. Jalil, S. S. Ibrahim, and R. A. Jafer, “Surface Roughness Effect on Discharge Coeffient of Broad Crested Weir,” Research Journal of Applied Sciences, Engineering and Technology, vol. 7, no. 24, pp. 5227–5233, 2014. DOI: https://doi.org/10.19026/rjaset.7.918

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. DOI: https://doi.org/10.48084/etasr.395

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. DOI: https://doi.org/10.48084/etasr.2837

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. DOI: https://doi.org/10.48084/etasr.2584

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. DOI: https://doi.org/10.1080/00221680209499950

H. A. Al-Majeed Hayawi, A. A. Al-Ghani Yahia, and G. A. Al-Majeed 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. 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. DOI: https://doi.org/10.33899/rengj.2009.43616

A. R. Kabiri-Samani, "Analytical Approach for Flow over an Oblique Weir," Scientia Iranica, vol. 17, no. 2, Apr. 2010, Art. no. 2.

S. Kumar, Z. Ahmad, and T. Mansoor, "A new approach to improve the discharging capacity of sharp-crested triangular plan form weirs," Flow Measurement and Instrumentation, vol. 22, no. 3, pp. 175–180, Jun. 2011. DOI: https://doi.org/10.1016/j.flowmeasinst.2011.01.006

S. Jalil and S. Sarhan, "Experimental study of combined oblique weir and gate structure," ARPN Journal of Engineering and Applied Sciences, vol. 8, no. 4, pp. 306–316, Apr. 2013.

M. Masoudian, R. Fendreski, and M. Gharahgezlou, "The effects of laboratory canal size and cylindrical weir-gate diameter on discharge coefficient," Technical Journal of Engineering and Applied Sciences, vol. 3, no. 15, pp. 1630–1634, 2013.

A. Severi, M. Masoudian, E. Kordi, and K. Röttcher, "Experimental Investigation on Discharge Coefficient Changes of Moveable Cylindrical weir-gate," in 7th SASTech 2013, Bandar-Abba, Iran, Jan. 2013, vol. 2, pp. 7–10.

K. Gupta, S. Kumar, and Z. Ahmad, "Effect of Weir Height on Flow Performance of Sharp Crested Rectangular-Planform Weir," World Applied Sciences Journal, vol. 33, no. 1, pp. 168–175, Jan. 2015.

B. M. A. Noori and N. T. Aaref, "Hydraulic Behavior of Sharp Crested Triangular Plan Form Weirs," Journal of Duhok University (Pure Engineering and Science), vol. 19, no. 1, pp. 331–341, 2016.

B. M. A. Noori and N. T. Aaref, "Hydraulic Performance of Circular Crested Triangular Plan Form Weirs," Arabian Journal for Science and Engineering, vol. 42, no. 9, pp. 4023–4032, Sep. 2017. DOI: https://doi.org/10.1007/s13369-017-2566-3

A. Bachaya, H. N. Hashmi, M. A. Baluch, Z. Ali, and A. Latif, "Flow Characteristics Over the Weir with Semi-Circular Crest in Normal and Oblique Plane," Technical Journal, UET Taxila, vol. 24, no. 1, pp. 1–8, Mar. 2019.

K. Hosseini, E. J. Nodoushan, R. Barati, and H. Shahheydari, "Optimal design of labyrinth spillways using meta-heuristic algorithms," KSCE Journal of Civil Engineering, vol. 20, no. 1, pp. 468–477, Jan. 2016. DOI: https://doi.org/10.1007/s12205-015-0462-5

B. M. A. Noori, "Hydraulic performance of circular crested oblique weirs," Ain Shams Engineering Journal, vol. 11, no. 4, pp. 875–888, Dec. 2020. DOI: https://doi.org/10.1016/j.asej.2020.02.014

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How to Cite

[1]
S. S. Ibrahim, R. A. Jafer, and B. M. A. Said Ali, “An Experimental Study of a Combined Oblique Cylindrical Weir and Gate Structure”, Eng. Technol. Appl. Sci. Res., vol. 13, no. 2, pp. 10483–10488, Apr. 2023.

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