Volume 15, Issue 57 (fall 2011)
jwss 2011, 15(57): 23-33 |
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P. Shojaei, D. Farsadizadeh, A. Hoseinzadeh Dalir. Effects of Combined Submerged Vanes and Collar on the Scour Reduction around Cylindrical Bridge Piers. jwss 2011; 15 (57) :23-33
URL: http://jstnar.iut.ac.ir/article-1-1857-en.html
URL: http://jstnar.iut.ac.ir/article-1-1857-en.html
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Abstract: (18461 Views)
Submerged vanes are low aspect ratio flow-training structures mounted vertically on the river bed at an angle to the prevailing flow. The aim of application of vane is to generate a secondary circulation in the main flow, designed to modify the near-bed flow pattern and thus redistribute flow and sediment transport within the channel cross section. Collar is a flat sheet with low thickness fixed vertically on the pier at stream bed level or near it. Installation of a collar leads to protect the river bed against the direct impact of downflow produced at the upstream face of the pier and therefore reduces the scour depth. This research is a laboratory study that examines the effectiveness of submerged vanes and combination of submerged vanes and collar as a pier scour protection device. Experiments were conducted in an 8 m long and 0.8 m wide flume and a cylindrical pier used was 6 cm in diameter. Clear-water scour tests with u*/u*c = 0.9 were performed with a collar 3 times wider than the pier diameter at the stream bed level and submerged vanes 1.5 times longer than the pier diameter at the stream bed level (H=0). Different arrays of vanes with different angles to main flow direction were employed. The highest reduction in the depth of scour hole with four vanes and a collar showed 61% reduction in scour depth.
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