Effect of Perforated Inclination and Height of Sill on Maximum Scour Depth and Energy Losses Downstream a Sluice Gate | ||||
| The Egyptian International Journal of Engineering Sciences and Technology | ||||
| Volume 47, Issue 1, September 2024, Page 25-32 PDF (989.15 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/eijest.2023.244843.1249 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Elsayed mohamed Elshahat1; samar hassan  2; Gamal Mohamed Mostafa Abdelaal3; Eslam Eltohamy 4
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| 1Water and Water Structure Engineering Department, Faculty of Engineering, Zagazig University, Zagazig, Egypt | ||||
| 2Faculty of Engineering, Zagazig university, Zagazig, Egypt | ||||
| 3Water and Water Structures Engineering Department, Faculty of Engineering, Zagazig University, Zagazig, Egypt | ||||
| 4Zagazig University | ||||
| Abstract | ||||
| Screens have proven to be an effective choice for decreasing scour downstream of small hydraulic structures. This paper studies experimentally the performance of an inclined perforated sill with a fixed porosity of 41.1% and varied height. Six different relative heights (from 0.34 to 2.25) and inclination angles of screens (30 ˚, 60 ˚, 90 ˚, 120 ˚, and 150) were tested under different flow conditions. The presence of a screen in the stilling basin reduced the maximum scour depth until the relative screen height was less than two compared to the no-screen case. A relative screen height greater than two increases the maximum scour depth. The best relative height of the screen is found to be approximately unity from the scour point of view. while the relative energy loss increases positively with the relative screen heights. Moreover, the vertical angles provide the best conditions for scour and energy dissipation. Finally, an empirical equation was developed to predict the maximum scour depth. A good agreement was found between the results of the predicted equation and the experimental results, with a mean relative error of about 6%. | ||||
| Keywords | ||||
| screen; sill height; sill inclination; and maximum scour depth | ||||
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