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Local scour at open-channel junctions

Borghei, S. M ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1080/00221686.2010.492107
  3. Publisher: 2010
  4. Abstract:
  5. High bed-shear stress resulting from secondary flows and velocity increase at a channel junction cause local erosion and deposition in natural rivers and earth-lined channels. Herein, the scour patterns at the junction of two loose bed channels were studied under clear-water conditions. The main dimensionless variables are the angle between the two approach flow branches, the discharge and width ratios of the tributary to the downstream channel branches, and the ratio of the mean downstream velocity to the threshold velocity. The results indicate that the position of the maximum scour depth temporally moves to the outer wall and upstream to the main channel, as affected by the dimensionless variables. The effects of these variables are given in graphs and are expressed with a formula for maximum scour depth
  6. Keywords:
  7. Tributary flow ; Approach flow ; Channel junctions ; Clear-water condition ; Dimensionless variables ; Downstream channels ; Erosion and deposition ; Experimentation ; Local scour ; Natural river ; Open channels ; River hydraulics ; Scour depth ; Threshold velocity ; Width ratio ; Bridge piers ; Hydraulics ; Plasma theory ; Rivers ; Deposition ; Dimensionless number ; Experimental design ; Flow velocity ; Open channel flow ; Scour ; Shear stress ; Threshold ; Tributary
  8. Source: Journal of Hydraulic Research ; Volume 48, Issue 4 , Sep , 2010 , Pages 538-542 ; 00221686 (ISSN)
  9. URL: http://www.tandfonline.com/doi/abs/10.1080/00221686.2010.492107?journalCode=tjhr20