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Controlling Local Scour Due to Hydraulic Jump Using Oblique Buried Plates

Borhani, Sanaz | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42653 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Borghei, Mahmood
  7. Abstract:
  8. Local scouring at the downstream of sluice gates in the erosive beds is one of the main concerns of hydraulic engineers because of the significant damage that it can cause to the hydraulic structures. It is important to control the local scour depth at downstream of hydraulic structures to ensure safety operation of these systems. Many researchers have conducted various studies to predict the maximum depth and diameter of scour hole and develop new methods in order to control this phenomenon. One way to overcome this problem is the use of apron, or non-erosive bed. In order to shorten the apron length or decrease the effect of the turbulence flow, different measures can be done which can be divided into two main branches: “energy dissipating” and “bed reinforcement”. In this thesis, laboratory experiments have been conducted to investigate the scour phenomenon under clear water scour condition, uniform sediment and bed reinforcement, using oblique buried plates which were placed at different angles and distances from the apron. The results have been plotted as longitudinal scour profiles that show the angle and location of the buried palates play an important role in characteristics of the occurred scour at downstream of sluice gate. Also, the maximum scour depth and the rate of sediment transport decrease with angle of the plates. It has been shown that scour could be reduced up to approximately 60% by using an oblique buried plate that had 50 degrees angle with flow direction
  9. Keywords:
  10. Hydraulic Jump ; Local Scouring ; Buried Plate ; Uniform Sediment ; Sluice Gate

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