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Investigating the Effect of the Flip Buckets with Dentated for Stability of Riprap at Downstream of the Structure
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Mehdi Nirobakhsh   , Alireza Masjedi * , Mohammad Haidarnejad , Amin Bordbar |
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Abstract: (258 Views) |
Spillway is among the most economical energy dissipating structures used in dams to dissipate flow at the end of the structure. Scouring is a phenomenon that occurs next to the hydraulic structures, leading to their deterioration and even collapse. One of the methods to control scouring downstream of a dam is using riprap. In this study, the stability of riprap based on relative particle diameter (RPD) downstream of spillways of two different categories of energy dissipators: simple and dentated flip bucket was investigated. The experiments were performed in a rectangular test flume. Ripraps of the same density and of four different diameters were investigated at five discharges at the movement threshold. Results suggested that the RPD was an important factor in stability of the riprap. Besides, in both of the examined spillways, the stability number at the movement threshold was found to decrease with increase in the RPD. For all of the RPDs studied, the stability number downstream of the dentated flip bucket was found to be 11 percent greater than that of the simple flip bucket, which may be ascribed to the presence of dentate in the former. Likewise, dentated flip bucket offered a higher level of energy dissipation.
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Article number: 5 |
| Keywords: Froud number, Riprap, Stability number, Flip bucket. |
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Full-Text [PDF 999 kb]
(104 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2022/08/27 | Accepted: 2022/11/24 | Published: 2024/02/12
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