ASSESSMENT OF FLOW CHARACTERISTICS ALONG THE HYDRAULIC PHYSICAL MODEL OF A DAM SPILLWAY
DOI:
https://doi.org/10.33736/jcest.4550.2022Keywords:
stilling basin, spillway, dam, baffle, energy dissipation, flow behaviourAbstract
Water flowing over a spillway has a very high kinetic energy because of the conversion of the entire potential energy to kinetic energy. This circumstance results in damage or significant erosion at the toes of the spillways, weir bed, and downstream of a river. To solve this problem, the water flow velocity must be minimised. Physical modelling was implemented to this conundrum in order to modify the current energy dissipating structure, the stilling basin, to enhance energy dissipation as much as achievable by downstream velocity reduction. Baffle blocks were adopted as the modification in this study because these are widely used to stabilize the jumps, shorten its length, and maximize energy dissipation. A selection of baffle arrangements was evaluated by positioning them in the stilling basin’s mid-span to identify the most effective outcome in minimizing downstream velocity. From the findings, it was clearly shown the arrangement of baffles blocks at the stilling basin impacts velocity reduction in various discharge cases. The formation of cross-waves was also assessed at the discharge channel at every discharge value with its relative distance from the sump and the width of the channel prior to the site. For discharge situations of 70.0 L/s and 100.0 L/s, modifications to the Type II stilling basin were recommended. Furthermore, constriction, expansion, or curvature should be avoided in chute spillways identical to the dam spillway to limit cross-wave generation and other unfavourable flow behaviours.
References
Rong, Y., Zhang, T., Peng, L., & Feng, P. (2019). Three-dimensional numerical simulation of dam discharge and flood routing in Wudu reservoir. Water, 11(10), 2157. https://doi.org/10.3390/w11102157
Razzak Al-Husseini, T. (2015). Experimental study of increasing energy dissipation on stepped spillway. Journal of Kerbala University, 11(1), 87-100.
Hayder, A. M., & Jafar, M. S. (2015). Investigation of energy dissipation in stepped spillway with semicircular steps treads. Asian Transactions on Engineering, 5(3), 1–5.
Ammar, H. K., Isam, M. A., & Zainab, T. (2016). Study the effect of spillway locations on the hydraulic properties of spillway. Ciência e Técnica Vitivinícola, 31(5), 90–106.
Nigam, U., Das, S., & Choudhury, M. R. (2016). Overview of energy dissipators and stilling basins with design aspects of hydraulic jump type energy dissipators. Conference Proc NCIET.
Abdel Aal, G. M., Sobeah, M., Helal, E., & El-Fooly, M. (2018). Improving energy dissipation on stepped spillways using breakers. Ain Shams Engineering Journal, 9(4), 1887–1896. https://doi.org/10.1016/j.asej.2017.01.008
Daneshfaraz, R., & Ghaderi, A. (2017). Numerical investigation of inverse curvature ogee spillway. Civil Engineering Journal, 3(11), 1146–1156. https://doi.org/10.28991/cej-030944
Gu, S., Ren, L., Wang, X., Xie, H., Huang, Y., Wei, J., & Shao, S. (2017). SPHysics simulation of experimental spillway hydraulics. Water, 9(12), 973. https://doi.org/10.3390/w9120973
Orekhov, G. (2018). Hydraulic spillways using the effect of interacting circulation currents. IOP Conference Series. Materials Science and Engineering, 365, 042023. https://doi.org/10.1088/1757-899x/365/4/042023
Hien, L. T. T. (2020). Study the flow over chute spillway by both numerical and physical models. In APAC 2019 Springer Singapore, 845–851. https://doi.org/10.1007/978-981-15-0291-0_116
Ghazi, B., Daneshfaraz, R., & Jeihouni, E. (2019). Numerical investigation of hydraulic characteristics and prediction of cavitation number in Shahid Madani Dam's Spillway. Journal of Groundwater Science and Engineering, 7(4), 323-332. https://doi.org/10.19637/j.cnki.2305-7068.2019.04.003
Nouri, M., Sihag, P., Salmasi, F., & Kisi, O. (2020). Energy loss in skimming flow over cascade spillways: Comparison of artificial intelligence-based and regression methods. Applied Sciences (Basel, Switzerland), 10(19), 6903. https://doi.org/10.3390/app10196903
Abbas, A. S., Alwash, H. H., & Mahmood, A. H. (2018). Effect of baffle block configurations on characteristics of hydraulic jump in adverse stilling basins. MATEC Web of Conferences, 162, 26–32. https://doi:10.1051/matecconf/201816203005
Chatila, J. G., & Jurdi, B. R. (2004). Stepped spillway as an energy dissipater. Canadian Water Resources Journal, 29(3), 147–158. https://doi.org/10.4296/cwrj147
Yang, C. S., Kao, S. -P. &., Lee, F. B., & Hung, P. -S. (2004). Twelve different interpolation methods: A case study of Surfer 8.0. In Proceedings of the XXth ISPRS Congress, 35, 778–785.
Li, Q., Li, L., & Liao, H. (2018). Study on the best depth of stilling basin with shallow-water cushion. Water, 10(12), 1801. https://doi.org/10.3390/w10121801
Ahmed, S. S., & Aziz, Y. W. (2018). Evaluation of hydraulic performance of Nazanin dam side channel spillway. Zanco Journal of Pure and Applied Sciences, 30(1), 62-69. https://doi.org/10.21271/ZJPAS.30.s1.7
Nunes, A. F. P. (2017). Computational modelling of skimming flow over stepped spillways with sidewall convergence.
Dehdar-Behbahani, S., & Parsaie, A. (2016). Numerical modeling of flow pattern in dam spillway’s guide wall. Case study: Balaroud dam, Iran. Alexandria Engineering Journal, 55(1), 467-473. https://doi.org/10.1016/j.aej.2016.01.006
Mahtabi, G., Chaplot, B., Azamathulla, H. M., & Pal, M. (2020). Classification of hydraulic jump in rough beds. Water, 12(8), 2249. https://doi.org/10.3390/w12082249
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