Evaluation of Energy Dissipation over Dentate Blocks Spillway and Comparing the Energy Dissipation with Stepped Spillway

Document Type : Research Article

Authors

1 Graduate Student, Water Engineering Department, Shiraz University, Shiraz, Iran

2 Professor, Civil & Environmental Engineering Department, Shiraz University, Shiraz, Iran

3 Assistant Professor, Water Department, Shiraz University, Shiraz, Iran

Abstract

Many investigations have been performed in order to increase the efficiency of energy dissipation over the spillways. In this study, the chute was roughened by means of the dentate blocks that were made of Teflon with new geometric shape and configurations.  The experiments were carried out at three slopes, under six discharges and five dentate blocks configurations. Based on the laboratory results, it was concluded that the roughness geometry influences the relative energy loss. It was also found that using mix arrangements and selecting different sizes among roughness elements can increase the value of relative energy loss. Finally, it was observed that the dentate blocks spillway caused an extra 21% reduction in energy dissipation compared to the stepped spillway which is widely utilized to dissipate the energy.

Keywords

References

مردشتی، ا.، و طالب بیدختی، ن. (1386). "ارتقا استهلاک انرژی سرریزهای پلکانی با استفاده از فرایند پله- حوضچه‌ای رودخانه‌های کوهستانی"، مجله تحقیقات منابع آب ایران، 3 (2 (مسلسل 8))، ص.ص. 48-61.
مردشتی، ا.، طالب بیدختی، ن.، و جوان، م. (1386). "ارزیابی استهلاک انرژی جریان دو فازی روگذر سرریز پلکانی به کمک گودال آبشستگی پایین‌دست"، مجله هیدرولیک، 4، ص.ص. 1-22.
Barani, G.A., Rahnama, M.B., and Sohrabpoor, N. (2005). “Investigation of flow energy dissipation over different stepped spillways.” American Journal of Applied Sciences 2, pp. 1101-1105.
Chanson, H. (2002). The Hydraulics of stepped chutes and spillways, Balkema, ISBN 90 58003522.
Chanson, H. and Gonzalez, C.A. (2004). “Stepped spillways for embankment dams. Review, progress and development in overflow hydraulics.” Hydraulics of Dams and River Structures Conference, Tehran, Taylor and Francis Group, London.
Chinnarasri, C. and Wongwises, S. (2006). “Flow patterns and energy dissipation over various stepped chutes”, Journal of Irrigation and Drainage Engineering, Vol. 132, (1), pp. 70-76.
Peruginelli, A. and Pagliara, S. (2000). “Energy dissipation among stepped channel, drop and ramp structures”, Proc. Int. Workshop on Hydaulics of Stepped Spillways, VAW, ETH Zurich, Monor, H.E., and Hager, W.H., (Eds).

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History

  • Receive Date: 07 March 2015
  • Accept Date: 07 March 2015

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