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Experimental Study on Deposition Behavior of Turbidity Current

Khavasi, Ehsan | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39792 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Firoozabadi, Bahar
  7. Abstract:
  8. Density currents are occurred as a result of the intrusion of a dense fluid into a fluid with a different density. Density difference is the main agent of current’s movement. These currents are observed in nature numerously and they are one of the main reasons of the erosion and transportation of deposition in oceans, seas and rivers. Investigation of these currents is of great importance especially in dams’ reservoir as major cause of deposition and reduction of reservoir’s efficency. Density differences are typically caused by the difference in temperature, existence of solution or insoluble material and suspended solids. In this work, density current is studied experimentally. Density current, containing kaolin sediments, is inspected two dimensionally in a channel whose length is 12m. Velocity and concentration profiles are obtained by ADV (Acoustic Doppler Velocimetry). Turbidity currents are considered for studying of deposition behavior of density current. To the best of our knowledge the effect of inlet parameters, such as inlet Froude number, inlet concentration, inlet gate’s height, and bed slope is not inspected in previous works. For investigation of deposition behavior, the flux of suspended sediments is evaluated. For evaluation of this parameter, it’s necessary to separate suspended sediments are from above diffusion region and near bed depositional district. Method of determination above diffusion region and near bed depositional district is discussed. Results are shown that inlet Forude number, inlet gate’s height and bed slope poses importance effect on the structure and deposition behavior of the current.

  9. Keywords:
  10. Turbidity Current ; Bed Slope ; Inlet Gate Height ; Current Height ; Densimetric Froude Number ; Sedimentation ; Suspended Sediments Flux

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