Abstract
In this research, the effects of rough steps on the performance of stepped spillways in terms of energy dissipation were tested. To this end, two types of roughness including uniform and discrete were applied to the surface of the steps. For uniform roughness, sand with a given grain size and, for discrete roughness, fine blocks with specific dimensions were used. The results demonstrated that in the napped flow regime, roughing the steps increased the performance of stepped spillways regarding energy dissipation about 15–20% as compared with smooth stepped spillways. In terms of energy dissipation, the uniform rough stepped spillways are more efficient than the discrete rough stepped spillways.
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Abbreviations
- g :
-
Gravitational acceleration
- E :
-
Specific energy
- H :
-
Upstream total head
- H dam :
-
Height of dam
- h s :
-
Height of steps
- k s :
-
Height of roughness
- L :
-
Length of crest
- l s :
-
Length of steps
- PMF:
-
Probable maximum flood
- Q :
-
Discharge of flow (l/s)
- V :
-
Approach flow velocity
- y :
-
Depth of flow over crest
- y c :
-
Critical depth of flow
- ρ :
-
Flow density
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Torabi, H., Parsaie, A., Yonesi, H. et al. Energy Dissipation on Rough Stepped Spillways. Iran J Sci Technol Trans Civ Eng 42, 325–330 (2018). https://doi.org/10.1007/s40996-018-0092-5
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DOI: https://doi.org/10.1007/s40996-018-0092-5