Investigation of flow over a crump weir in free and submerged flow conditions
Subject Areas : Analysis, design and construction of water structures
Mohammadhasan Hashemi F
1
,
Ali Khoshfetrat
2
*
,
Elham Izadinia
3
,
Ehsan Delavari
4
1 - Department of Civil Engineering, Na.C., Islamic Azad University, Najafabad, Iran.
2 - Department of Civil Engineering, Isf.C., Islamic Azad University, Isfahan, Iran.
3 - Department of Civil Engineering, Faculty of Engineering and Technology, Shahid Ashrafi Esfahani University, Isfahan, Iran.
4 - Department of Civil Engineering, Na.C., Islamic Azad University, Najafabad, Iran.
Keywords: Discharge coefficient, Experimental model, Free flow, Numerical simulation, Submerged flow,
Abstract :
In this research, the discharge coefficient and flow pattern over a Crump weir with different geometries were investigated numerically and experimentally under varied hydraulic conditions in both free and submerged flow conditions. The results of this study can be effective in designing this type of hydraulic structure with regard to different hydraulic conditions. The numerical model of Flow-3D can be used for simulating the flow passing over a Crump weir with acceptable accuracy. The discharge coefficient of the Crump weir was reduced by enhancing the dimensionless ratio of the total hydraulic load to the weir height and Froude number. The highest discharge coefficient was observed in the Crump weir with a height of 0.2 m and an angle of 45◦ to the horizon in the free and submerged flow conditions. Also, the lowest coefficient discharge was created by the Crump weir with a height of 0.15 m and downstream and upstream angles of 60◦ and 30◦ relative to the horizon in both conditions, respectively. It was discovered that the discharge coefficient increased by almost 16% when the weirs were installed with the same upstream and downstream slope angles compared to when the upstream slope was greater than the downstream slope. The amount of hydraulic head upstream of the weir, the discharge coefficient, and Froude number increased by 7.3% and decreased by 3.3 and 5.24% in all the models in the submerged flow condition compared to the free flow condition. The discussion about the results obtained from this research is from other parts presented in this paper.
Abdi Chooplou, C., Ghodsian, M., Abediakbar, D., & Ghafouri, A. (2023). An experimental and numerical study on the flow field and scour downstream of rectangular piano key weirs with crest indentations. Innovative Infrastructure Solutions, 8(5), 140. https://doi.org/10.1007/s41062-023-01108-7
Achour, B., & Amara, L. (2022). Accurate discharge coefficient relationship for the Crump weir. LARHYSS Journal P-ISSN 1112-3680/E-ISSN 2521-9782, (52), 93-115.
Al-Khateeb, H. M. M., Sahib, J. H., & Al-Yasisri, H. H. H. (2019). An experimental study of flow over V-shape crump weir crest. In IOP Conference Series: Materials Science and Engineering (Vol. 584, No. 1, p. 012060). IOP Publishing.
Al-Naely, H., Al-Khafaji, Z., & Khassaf, S. (2018). Effect of opening holes on the hydraulic performance for crump weir. International Journal of Engineering, 31(12), 2022-2027. https://doi.org/10.5829/ije.2018.31.12c.05
Behroozi, A. M., & Vaghefi, M. (2022). Experimental and numerical study of the effect of zigzag crests with various geometries on the performance of A-type piano key weirs. Water Resources Management, 36(12), 4517-4533. https://doi.org/10.1007/s11269-022-03261-7
Bettess, P., White, W. R., & Bettess, R. (1984). Recirculation in Flow over Crump Weirs. In Channels and Channel Control Structures: Proceedings of the 1st International Conference on Hydraulic Design in Water Resources Engineering: Channels and Channel Control Structures, University of Southampton, April 1984 (pp. 103-117). Berlin, Heidelberg: Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-662-11300-4_9
Bodaghi, E., Abdi-Chooplou, C., & Ghodsian, M. (2024). Experimental investigation of scour downstream of a type A trapezoidal piano key weir under free and submerged flow conditions. Journal of Hydrology and Hydromechanics, 72(1), 34-48. https://doi.org/10.2478/johh-2023-0041
Deelstra, J., Vandsemb, S., Eggestad, H. O., Bechmann, M., & Vagstad, N. (2002). Monitoring and Assessment of Non-Point Source Pollution in Norway.
Flow Science, Inc. FLOW-3D® Version 10.0 (Computer software). https://www.flow3d.com(2011)
Habibi, M.S., & Khosrowjerdi, A. (2008). Investigation of the discharge coefficient of a Cramp weir and its comparison with that of an ogee weir by using FLUENT software. The 3rd Conference of Water Resources Management, Tabriz, Iran. https://civilica.com/doc/50444
Hashemi Fesharaki, M. H., & Khoshfetrat, A. (2024). Experimental Investigation of Energy Loss in Crump Spillways in Free Flow and Submerged State. Modares Civil Engineering journal, 24(2), 157-167.
Hosseini Mobarra, S.E., & Yasi, M. (2013). The effect of the height of a short-edged weir (Crump weir) on its flow pattern at a 90-degree bend. 12th Hydraulic Conference, Karaj, Iran. https://civilica.com/doc/379448
Hussein, J. N. (2014). Experimental study of height and surface roughness effects of crump weirs on over flow characteristics. Journal of Babylon University/Engineering Sciences, 22(4), 845-859.
Karimi, M., Attari, J., Saneie, M., & Jalili Ghazizadeh, M. R. (2018). Side weir flow characteristics: comparison of piano key, labyrinth, and linear types. Journal of Hydraulic Engineering, 144(12), 04018075. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001539
Keller, R. J. (1989). Sloping crest crump weir. Journal of irrigation and drainage engineering, 115(2), 231-238. https://doi.org/10.1061/(ASCE)0733-9437(1989)115:2(231)
Khalifa, S. Y., Adeogun, B. K., Ismail, A., Ajibike, M. A., & Muhammad, M. M. (2021). Experimental Study to Determine Flow Parameters over Roughed Crump Weir Models. ATBU Journal of Science, Technology and Education, 9(2), 18-29.
Łukaszewicz, G., & Kalita, P. (2016). Navier–stokes equations. Advances in Mechanics and Mathematics, 34.
Muhsun, S. S., Al-Madhhachi, A. S. T., & Al-Sharify, Z. T. (2020). Prediction and CFD simulation of the flow over a curved crump weir under different longitudinal slopes. International Journal of Civil Engineering, 18(9), 1067-1076. https://doi.org/10.1007/s40999-020-00527-2
Muhsun, S. S., Talab Al-Osmy, S. A., Al-Hashimi, S. A. M., & Al-Sharify, Z. T. (2019). Theoretical, CFD simulation and experimental study to predict the flowrate across a square edge broad crested weir depending on the end depth as a control section. In AWAM International Conference on Civil Engineering (pp. 15-34). Cham: Springer International Publishing. https://doi.org/10.1007/978-3-030- 32816-0_2
Oertel, M. A. R. I. O. (2015). Discharge coefficients of piano key weirs from experimental and numerical models. In 36th IAHR World Congress the Hague. Netherlands.
Rockne.karl, (2006). laboratory 7-open channel flow, www.uic.edu / classes / cmeng 211 / lab 7
Sarhan, S. A., & Jalil, S. A. (2018). Analysis of simulation outputs for the mutual effect of flow in weir and gate system. Journal of University of Babylon for Engineering Sciences, 26(6), 48-59.
Sarker, M. A., Rhodes, D. G., & Armstrong, G. S. (2006). Modification of Crump weir to facilitate fish passage. Environmental Hydraulics and Eco-Hydraulics, Theme B, Proceedings: 21St Century: The New Era for Hydraulic Research and Its Applications, 371.
Spaan, G. B. H., Van Nooyen, R. R. P., De Graaff, B. J. A., & Brouwer, R. (2003). Discharge formulas of Crump-de Gruyter gate-weir for computer simulation. Journal of irrigation and drainage engineering, 129(4), 270-277.
Stott.tim, (2006). Measuring stream flow, www.filter.ac.uk / Fluvial Geomorphology
Woldesemayat, E. M., & Genovese, P. V. (2021). Monitoring urban expansion and urban green spaces change in Addis Ababa: Directional and zonal analysis integrated with landscape expansion index. Forests, 12(4), 389. https://doi.org/10.3390/f12040389