Surface Roughness Effect on Discharge Coefficient of Combined Cylindrical Weir Gate Structure

Authors

  • Shaker A. Jalil University of Duhok
  • Safa S. Ibrahim University of Zakho

Keywords:

cylindrical weir, gate, surface roughness, Combined discharge measuring structure, discharge coefficient

Abstract

The aim of this research is to investigate the effect of surface roughness on the performance of weir and gate. An experimental study in a laboratory flume is carried out to study flow over and under cylindrical weir gate in combined structure as flow measurement device. Four models having different diameters were tested in a laboratory flume. In each model, the surface was roughed four times. The results of the test show logical negative effect of the increase of surface roughness on the performance. The performance of the combined structure improved with decrease ratio of roughness to the upstream head (Ks/H) and with the increase of the total head to the diameter of the weir (H/d). Empirical relations were obtained to estimate the variation of discharge coefficient (Cd) in terms of some dimensionless parameters. Within the limitations of the present experimental work an equation to predict the discharge is proposed with R2 of 0.936. Finely the contribution of the gate increases relative to the weir when the surface roughness increases.

Author Biographies

Shaker A. Jalil, University of Duhok

Assistant Professor, Water Recourses Engineering Department, Faculty of Engineering, University of Duhok, Iraq

Safa S. Ibrahim, University of Zakho

2Assistant Lecture, Petroleum Engineering Department, Faculty of Engineering, University of Zakho, Iraq

References

Ghobadian, R., Chaghabagi, F., Farmanifard, M., and Ahmadi, A. (2013) .Effect of Crest Roughness on Flow Characteristics over Circular Weirs. Civil Engineering Infrastructures Journal, Vol. (46), No. (2).
Hayawi, H. A. M., Hayawi, G. A. M., and Alniami, A. A. G. (2009). Coefficient of Discharge for a Combined Hydraulic Measuring Device. Al-Rafidain Engineering, Vol. (17), No. (6).
Hayawi, H. A., Yahia, A.A., and Hayawi, Gh. A. (2008). Free Combined Flow over a Triangular Weir and under Rectangular Gate. Damascus University Journal, Vol. (24), No. (1).
Jalil, Sh. A., and Sarhan, S. A. (2013). Experimental Study of Combined Oblique Weir and Gate Structure. ARPN Journal of Engineering and Applied Sciences, Vol. (8), No. (4).
Jalil, Sh. A., Ibrahim, S. S. and Jafer, R. A. (2014). Surface Roughness Effects on Discharge Coefficient of Broad Crested Weir. Research Journal of Applied Sciences, Engineering and Technology, Vol. (7), No. (24), Pp. 5227-5233.
Khassaf, S.I., Yost, S. A., and Abbas, H. A. (2013). Coefficient of Discharge for a Compound Weir Combined with Semicircular Gate. International Journal of Advance Research, Vol. (1), No. (9).
Masoudian, M., Fendreski, R., and Gharahgezlou, M. (2013). The Effects of laboratory Canal Size and Cylindrical Weir-Gate Diameter on Discharge Coefficient. Tech Journal Engineering and Applied Sciences, Vol. (3), No. (15), Pp. 1630-1634.
Mohammed, M. Y., Taee, A. Y., and Al-Talib, A. N., (2011). Gravel Roughness and Channel Slope Effects on Rectangular Free Overfall. Damascus University Journal, Vol. (17), N0. (1).
Negm, A. M., AL-Brahim, A. M., and Alhamid, A. A. (2002). Combined-Free Flow over Weirs and below Gates. Journal of Hydraulic Research, Vol. (40), No. (3).
Othman, k. I., Chimeran, T. A., and Al-Hafith, I. A. I., (2011). Effect of Size and Surface Roughness of Cylindrical Weirs on over Flow Characteristics. Al-Rafidain Engineering, Vol. (19), No. (2).
Severi, A., Masoudian, M., Kordi, E., Roettcher, K. (2013). Experimental Investigation on Discharge Coefficient Changes of Moveable Cylindrical Weir-Gate. Khavaran Institute of Higher Education.

Downloads

Published

2015-06-30

How to Cite

Jalil, S. A., & Ibrahim, S. S. (2015). Surface Roughness Effect on Discharge Coefficient of Combined Cylindrical Weir Gate Structure. Science Journal of University of Zakho, 3(1), 153–163. Retrieved from https://sjuoz.uoz.edu.krd/index.php/sjuoz/article/view/123

Issue

Vol. 3 No. 1 (2015): June, 2015

Section

Science Journal of University of Zakho

License

Authors who publish with this journal agree to the following terms:

  • Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License [CC BY-NC-SA 4.0] that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.
  • Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work, with an acknowledgment of its initial publication in this journal.
  • Authors are permitted and encouraged to post their work online.