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Effect of the Hydraulic Characteristics of Flow on the Rate of Energy Dissipation in Stepped Chutes Structures

Document Type : Original Manuscript

Authors

1 Department of Water Sciences and Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran

2 Department of Water Sciences and Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.

Abstract

Due to the simplicity of operation, Stepped Chutes are among the most common water buildings to reduce water flow energy in irrigation systems. So this research has studied the impact of structure slope, the number of stairs and structure height on energy dissipation rate in stepped chutes. Experimental models used in 2, 20 and 30 cm height, 26.5-degree slope channels (1: 2) and 33.3 degrees (1: 1.5) and in 3, 5, and 7 stairs were built. All tests were done in 4 different rate discharges 10, 13, 15 and 20 liters per second in the laboratory flume, Islamic Azad University of Ahvaz. The results showed that by increasing the amount of  the energy dissipation rate will be reduced. It can be also seen that for a certain value of  Yc/Δz, the increase in the number of stairs reduces the amount of relative energy dissipation. Also Results showed that increasing the slope, the relative energy dissipation rate increases. In this study, the maximum amount of relative energy dissipation for a model with a slope of z = 2 and a height of 30 cm obtained and the minimum amount of energy dissipation for a model with a slope of z = 1.5 and a height of 20 cm obtained. Results showed that increasing the Froude number, the energy dissipation rate will be reduced.

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References
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Journal of Marine Science and Technology
Volume 21, Issue 2
July 2022
Pages 94-105
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