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Experimental Study on Erosion Control at Channel Junctions with Submerged Vanes

Nozari, Soheil | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44513 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Jamali, Mirmosaddegh
  7. Abstract:
  8. In this study, the effect of submerged vanes on the bed erosion pattern at a 90° open-channel junction has been evaluated experimentally. In this study, 41 tests have been conducted in four different steps. In each test, the bed surface level has been measured at the end of 1st, 2nd and 24th hour. In the first step, the preliminary tests have been conducted. In this step, six different formations of submerged vanes have been selected and their performance has been evaluated and the most efficient formation, in the field of maximum scour depth reduction, has been selected. In the second step, six different formations of submerged vanes have been selected and their performance has been evaluated. This selection of formations is based on the best formation which has been chosen in the previous step. In this step, tests have been conducted under three different flow ratios. The flow ratio is defined as the ratio of the branch channel flow to the total flow. In the second step, two formations have been selected as the most efficient formations. In the third step, the flow depth in the downstream of the main channel has increased and it means that the tailwater Froude number has been reduced. In this step, tests have been conducted under three different flow ratios and two formations of submerged vanes have been selected and their performance has been evaluated. These two formations are the best formations among the second step formations. The results show that these two formations have an acceptable performance in the field of maximum scour depth reduction. However the efficiency of submerged vanes is reduced when the flow depth in the downstream of the main channel increases. In the fourth step, the effect of vane’s height on the vane performance, in the field of maximum scour depth reduction, has been evaluated. The results show that unusual increase in vanes height will reduce its efficiency. Finally, this study concludes that the appropriate formation of submerged vanes which installed in both main and branch channels will best reduce the maximum scour depth at channel junctions
  9. Keywords:
  10. Scour ; Channel Junction ; Erosion Control ; Submerged Vanes

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