FLOW AND ENERGY DISSIPATION OVER ON FLAT AND POOLED STEPPED SPILLWAY
DOI:
https://doi.org/10.11113/jt.v78.5973Keywords:
Energy dissipation, flat steps, pooled stepsAbstract
The stepped spillway has increasingly become effective energy dissipation. The stepped spillway has been accepted to be the most powerful hydraulic structure to dissipate large flow energy downstream from spillway crest. The steps act as roughness elements significantly increase the dissipation energy rate. The physical study has performed on flat and pooled stepped spillways with a slope spillway    (θ = 45˚) and number of steps (N): 20 and 40. The experiments were conducted for ten Froude number (Fr) run ranging from 1.117 to 9.909 with 0.700<yc/h<3.00. The focus of research to investigate the relationship between relative energy losses in skimming flow performance against Froude number on various stepped. The effect of number of steps is evident when the relative energy loss increases with the number of steps. In addition, the relative energy loss of flow on pooled steps is dissipating more energy than flat steps.
References
Chinnarasri, C., and S. Wongwises. 2006. Flow Patterns And Energy Dissipation Over Various Stepped Chutes. J. Irrig. Drain. Eng. 132(1): 70-76.
Chanson, H., and L. Toombes. 2001. Experimental Investigations Of Air Entrainment In Transition And Skimming Flows Down A Stepped Chute: Application To Embankment Overflow Stepped Spillways. Department of Civil Engineering: University of Queensland.
Chanson, H., Y. Yasuda, and I. Ohtsu. 2002. Flow Resistance In Skimming Flows In Stepped Spillways And Its Modelling. Can. J. Civ. Eng. 29(6): 809-819.
Barani, G. A., M. B. Rahnama, and H. Bagheri. 2005. Optimization Of Stepped Spillway Dimensions And Investigation Of Flow Energy Dissipation Over A Physical Model. J. Appl. Sci. 5: 878-882.
Takahashi, M., Y. Yasuda, and I. Ohtsu. 2004. Flow Characteristics of Skimming Flows in Stepped Channels. J. Hydraul. Eng. 9: 860-869.
M. A. Kökpinar. 2004. Flow Over A Stepped Chute With And Without Macro-Roughness Elements. Can. J. Civ. Eng. 31(5): 880-891.
N. Rajaratnam. 1990. Skimming Flow In Stepped Spillways. J. Hydraul. Eng. 116(4): 587-591.
Felder, S., and H. Chanson. 2013. Aeration, Flow Instabilities, And Residual Energy On Pooled Stepped Spillways Of Embankment Dams. J. Irrig. Drain. Eng. 139(10): 880-887.
D. Stephenson. 1991. Energy Dissipation Down Stepped Spillways. International Water Power and Dam Construction. 27-30.
Guenther, P., S. Felder, and H. Chanson. 2013. Flow Aeration, Cavity Processes And Energy Dissipation On Flat And Pooled Stepped Spillways For Embankments. Environ. Fluid Mech. 13(5): 503-525.
Downloads
Published
Issue
Section
License
Copyright of articles that appear in Jurnal Teknologi belongs exclusively to Penerbit Universiti Teknologi Malaysia (Penerbit UTM Press). This copyright covers the rights to reproduce the article, including reprints, electronic reproductions, or any other reproductions of similar nature.
