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Experimental Study of Natural Bed Roughness Effect on Hydraulic Condition and Energy Dissipation Over Chutes

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A Correction to this article was published on 28 March 2023

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Abstract

Energy control in high-speed flows is one of the main design challenges of hydraulic structures and drainage systems. Excessive flow energy can cause serious damages to these structures and may also lead to erosion and scouring at the downstream. Energy dissipation in such situation is usually accomplished by stilling basins, stepped spillways, or plunging jets. Using natural bed roughness to increase energy dissipation and reduce structural damage is more accessible in terms of implementation and significant reduction in construction costs. The present study is based on this phenomenon and was inspired by the Doroudzan dam spillway with a natural bed in Fars province of Iran. Application of obstacles or roughness on the bed of chute spillways can also be considered as an alternative for energy dissipation. In this study, the effect of bed roughness on flow domain and its dissipation of kinetic energy over chute has been experimentally investigated. For this purpose, several experiments on physical models were conducted with different geometrical and hydraulic conditions to determine their effects on flow over rough spillways. Experiments were performed with three slopes (15°, 22.5° and 30°), five uniform beds granulate roughness (5.1, 7.2, 11.1, 16 and 22 mm), and three discharges. The flow results over smooth spillway (made of Plexiglas) were also examined to compare the result. It was observed that bed roughness intensifies energy dissipation, modifies velocity and pressure domain, and eliminates cavitation tendency along the chute. The study proposes the advantage of natural bedrock as the spillway boundaries without concrete finishing. This idea offers environmentally friendly and cost-effective advantages with the benefit of enhanced energy dissipation and reduction in cavitation potential along chute spillways.

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Authors and Affiliations

  1. K.N. Toosi University of Technology, Tehran, Islamic Republic of Iran

    Hossein Noori Hasanabadi, Mohammad Reza Kavianpour, Amir Khosrojerdi & Hossein Babazadeh

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  1. Hossein Noori Hasanabadi
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  2. Mohammad Reza Kavianpour
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  3. Amir Khosrojerdi
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  4. Hossein Babazadeh
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Correspondence to Mohammad Reza Kavianpour.

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Hasanabadi, H.N., Kavianpour, M.R., Khosrojerdi, A. et al. Experimental Study of Natural Bed Roughness Effect on Hydraulic Condition and Energy Dissipation Over Chutes. Iran J Sci Technol Trans Civ Eng 47, 1709–1721 (2023). https://doi.org/10.1007/s40996-023-01060-7

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  • DOI: https://doi.org/10.1007/s40996-023-01060-7

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