EXPERIMENTAL STUDY TO EVALUATE THE HYDRAULIC PERFORMANCE OF BASTORA DAM STEPPED SPILLWAY

  • SARHANG M. HUSAIN Dept. of Dams And Water Resources, College of Engineering, University of Salahaddin, Kutdistan Region-Iraq
  • SHAHIN S. AHMED Dept. of Dams and Water Resources, College of Engineering, University of Salahaddin, Kutdistan Region-Iraq
Keywords: Physical Modelling, Bastora Dam Stepped Spillway, Discharge Coefficient, Energy Dissipation

Abstract

This study aims to evaluate the performance of proposed design for Bastora dam stepped spillway project. Experiments are conducted on a physical model, which is constructed at the laboratory of hydraulic engineering/ college of engineering/ Salahaddin University, Erbil- Iraq using an appropriate scale to avoid potential effects governing the model. The evaluation includes determining the flow regime passing the structure, length to and flow depth at the inception point, the efficiency of the structure to dissipate the energy at the toe, the height of side wall required for both the spillway chute and stilling basin at the downstream of the spillway and discharge coefficient. The results presented in the design report are compared with those measured/determined in this study and the design formulae of stepped spillway available in the literature. Although the comparisons show few discrepancies between the results, especially in terms of the energy dissipation rate and chute side wall dimension, the design report can be said acceptable and reliable.

Downloads

Download data is not yet available.

References

- Amador, A., Sanchez-Juny, M. and Dolz, J. (2009). Developing flow region and pressure fluctuations on steeply sloping stepped spillways. Journal of Hydraulic Engineering, 135(12), 1092-1100.
- André, S. (2004). High velocity aerated flows on stepped-chutes with macro-roughness elements. Communication 20, (2004), Laboratorie de Constructions Hydrauliques Ecole Polytechnique Federale de Lausanne: Lausanne, Switzerland. ISSN 1661-1179.
- Boes, R. M. and Hager, W. H. (2003). Hydraulic design of stepped spillways. Journal of Hydraulic Engineering, 129(9), 671-679.
- Boes, R. and Minor, H. E. (2002). Hydraulic design of stepped spillways for RCC dams. International Journal on Hydropower and Dams, 9(3): pp.87-91.
- Carvalho, R. F. and Martins, R. (2009). Stepped spillway with hydraulic jumps: application of a numerical model to a scale model of a conceptual prototype. Journal of hydraulic engineering, 135(7), 615-619.
- Chamani, M. R. and Rajaratnam, N. (1999). Characteristics of skimming flow over stepped spillways. Journal of Hydraulic Engineering, 125(4), 361-368.
- Chanson, H. (1993). Stepped spillway flows and air entrainment. Canadian Journal of Civil Engineering 20, 422-435.
- Chanson, H. (1994). Hydraulics of skimming flows over stepped channels and spillways Journal of Hydraulic Research, 32(3), 445-460.
- Chanson, H. (1996). Prediction of the transition nappe/skimming flow on a stepped channel. Journal of Hydraulic Research, IAHR, 34(3), 421-429.
- Chanson, H. (1997). Air bubble entrainment in free-surface turbulent shear flows. Academic Press.
- Chanson, H. (2000). Characteristics of Skimming Flow over Stepped Spillways. Journal of Hydraulic Engineering, 126(11), 862-865.
- Chanson, H. (2001). Hydraulic design of stepped spillways and downstream energy dissipators. Journal of Dam Engineering, 11(4), 205-242.
- Chanson, H. (2002). Hydraulics of stepped chutes and spillways. Lisse: A.A. Balkema publishers, CRC Press.
- Chanson, H., and C. Gonzalez (2005). Physical modelling and scale effects of air-water flows on stepped spillways. Journal of Zhejiang University-Science, A 6(3), 243-250.
- Chanson, H., Yasuda, Y., and Othsu, I. (2002). Flow resistance in skimming flows in stepped spillways and its modelling. Canadian Journal of Civil Engineering, 29(6), 809-819.
- Chatila, J. G., and Jurdi, B. R. (2004). Stepped spillway as an energy dissipater. Canadian Water Resources Journal, 29, 147-158.
- Chow, V. T. (1959). Open channel hydraulics. McGraw-Hill, New York, USA: McGraw-Hill,
- Felder, S., & Chanson, H. (2011). Energy dissipation down a stepped spillway with non-uniform step heights. Journal of Hydraulic Engineering, 137(11), 1543-1548.
- Frizzell, K. H., and Mefford, B. W. (1991). Designing Spillways to Prevent Dam cavitation. Concrete International, 13(5), 58-64.
- Frizzell, K. and Renna, F. M. (2011). Laboratory Studies on the Cavitation Potential of Stepped Spillways [online]. In: Valentine, EM (Editor); Apelt, CJ (Editor); Ball, J (Editor); Chanson, H (Editor); Cox, R (Editor); Ettema, R (Editor); Kuczera, G (Editor); Lambert, M (Editor); Melville, BW (Editor); Sargison, JE (Editor). Proceedings of the 34th World Congress of the International Association for Hydro- Environment Research and Engineering: 33rd Hydrology and Water Resources Symposium and 10th Conference on Hydraulics in Water Engineering. Barton, A.C.T.: Engineers Australia, 2011: 2420-2427.
- Hunt, S. L. and Kadavy, K. C. (2010). Energy dissipation on flat sloped-stepped spillway: I. Upstream of the inception point. Transactions of the American Society of Agricultural and Biological Engineers, ASABE, 53(1),103-109.
- Hunt, S., Reep, D. and Kadavy, K. C. (2008). RCC stepped spillways for Renwick dam-a partnership in research and design. Dam Safety Journal, 6(2), 32-40.
- Hunt, S. and Kadavy, K. C. (2010). Energy dissipation on flat sloped-stepped spillway: I. Upstream of the inception point. Transactions of the American Society of Agricultural and Biological Engineers, ASABE, 53(1), 103-109.
- Husain, S. M., Muhammed, J. R., Karunarathna, H. U., & Reeve, D. E. (2014). Investigation of pressure variations over stepped spillways using smooth particle hydrodynamics. Advances in Water Resources, 66, 52-69.
- Peyras, L., Royet, P. and Degoutte, G. (1992). Flow and energy dissipation over stepped gabion weirs. Journal of Hydraulic Engineering, ASCE, 118 (5), 707-717.
- Rajaratnam, N. (1990). Skimming flow in stepped spillways. Journal of Hydraulic Engineering 116, 587-591.
- Rice, C. E. and Kadavy, K. C. 1996. Model study of a roller compacted concrete stepped spillway. Journal of Hydraulic Engineering, ASCE, 122(6), 292-297.
- Roshan, R., Azamathulla, H. M., Marosi, M., Sarkardeh, H., Pahlavan, H., & Ab Ghani, A. (2010). Hydraulics of stepped spillways with different numbers of steps. Journal of Dams and Reservoirs, 20(3), 131-136.
- Sanchez-Juny, M., E. Blade, et al. (2008). Analysis of pressures on a stepped spillway. Journal of Hydraulic Research, 46, 410-414.
- Subramanya, K. (1982). Flow in Open Channels (3e). Tata McGraw-Hill Education.
- Takahashi, M., Gonzalez, C. A., & Chanson, H. (2006). Self-aeration and turbulence in a stepped channel: Influence of cavity surface roughness. International journal of multiphase flow, 32(12), 1370-1385.
- Yasuda, Y., Takahashi, M., & Ohtsu, I. (2001). Energy dissipation of skimming flows on stepped-channel chutes. Proceedings of 29th IHAR Congress, (pp.531-536), Beijing, China.
Published
2017-07-29
How to Cite
HUSAIN, S. M., & AHMED, S. S. (2017). EXPERIMENTAL STUDY TO EVALUATE THE HYDRAULIC PERFORMANCE OF BASTORA DAM STEPPED SPILLWAY. Journal of Duhok University, 20(1), 612-625. https://doi.org/10.26682/sjuod.2017.20.1.54