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Effects of different bed roughnesses on the characteristics of hydraulic jumps
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Date
2012
Author
Velioğlu, Deniz
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In practice, baffle blocks and sills are commonly being used to stabilize the location of a hydraulic jump and shorten the length of a stilling basin. On the other hand, gravels, corrugations and rectangular prismatic roughnesses which cover the entire length of the basin or placed in a staggered manner may be an alternative. The objective of this study is to determine the effects of these roughness elements on the characteristics of hydraulic jumps such as conjugate depth, jump length and energy dissipation using experimental data collected from the previous studies. The investigations show that the roughness elements have positive effects on the characteristics of hydraulic jumps. The tailwater depth reduction compared to classical jump is 2-10%. The length of the jump is reduced about by 30-50% by prismatic roughness elements, 40% by corrugations, and 30% by gravels. The roughness elements induce 3-15% more energy dissipation than that of classical jump. Therefore, these types of bed roughness elements should be considered as an effective alternative of accessory devices such as baffle blocks and sills.
Subject Keywords
Hydraulic jump.
,
Surface roughness.
URI
http://etd.lib.metu.edu.tr/upload/12614018/index.pdf
https://hdl.handle.net/11511/21276
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Graduate School of Natural and Applied Sciences, Thesis
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D. Velioğlu, “Effects of different bed roughnesses on the characteristics of hydraulic jumps,” M.S. - Master of Science, Middle East Technical University, 2012.
