Laboratory Investigation of Effect of Flat Submerged Vanes on Scour at Bridge Piers Group and Abutment

Document Type : Research Article

Authors

1 MSc Water structure, Department of Water Engineering, Faculty of Agriculture, University of Shahid Bahonar Kerman

2 water engineering department, faculty of agriculture, shahid bahonar university of kermen

3 Water Engineering, Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran

4 water engineering, Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran

Abstract

Local scour involves the removal of material from around piers and abutments as the flow accelerates around the obstructed flow area. Various methods have been suggested for the control and reduction of local scour around the bridge piers and abutment. Using submerged vanes is one of these methods. Vanes change the regime of bedload movement that led to control places of deposition and erosion. The function of vanes to reduce scour around the bridge piers and sediment movement in the region of vanes due to downflow in front of them are affected by arrays of the vanes. In the present study, different layouts of arrangements (parallel rows, two parallel rows, and two zigzag rows) flat submerged vanes with the ratio of length to height (L/H=3) at an angle of 20 degrees relative to the direction of flow on the protection of local scour around abutment and piers group with rectangular debris were investigated. All experiments conducted in uniform flow with clear water were being done. The results showed that the zigzag arrangement of the two-three rows had the greatest effect on the protection of local scour around the abutment. In this case, the vane distance from the abutment and the row spacing with the relative spacing is 0/5 and 1, respectively, (the distance of the vanes from the abutment was La and the distance of the rows was 2La) that reduced the scour depth by 81%.

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References

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Amirkabir Journal of Civil Engineering
Volume 53, Issue 7
October 2021
Pages 3149-3166

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