EFFECT OF CONCRETE SILL ON THE VELOCITY DISTRIBUTIONS AT THE DOWNSTREAM OF BARRAGES | ||||
| JES. Journal of Engineering Sciences | ||||
| Article 1, Volume 41, No 4, July and August 2013, Page 1380-1395 PDF (1.08 MB) | ||||
| Document Type: Research Paper | ||||
| DOI: 10.21608/jesaun.2013.114859 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
S. E. Mahgoub  ; S. Abdel-Fattah; K. Henafy
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| Hydraulics Research Institute, National Water Research Center, Egypt | ||||
| Abstract | ||||
| The effect of concrete sills on the velocity distributions so as their magnitude and the navigation path at the downstream side of barrages is investigated. The research also intended to determine the beginning of the apron and its end. A 3-D physical model was constructed with a fixed bed. Bollin Barrage which is located at about 100 km north of Cairo, Egypt was chosen to be investigated. The barrage suffers from cracks in the lock bed and stresses on the bed of the opening adjacent to the lock that might topple it. An experimental program was designed to investigate several alternatives that might solve the cracks formation. The test program was divided into 4 phases. Each phase investigates 3 scenarios. Experiments were executed and measurements were taken. Measurements were represented and analyzed. Based on the experimental results, it is concluded that the normal velocity distributions and the values of the lateral currents are attained when a concrete sill with a thickness of 1.2 m and a slope of 1:3 at both sides of the sill was implemented. This sill enhanced the height and length of the hydraulic jump. Also, operating all vents gives better results, regarding the velocity distributions. | ||||
| Keywords | ||||
| Concrete Sills; Velocity Distribution; Navigation Path; 3-D Physical Model | ||||
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