EFFECTS OF COMBINED SUBMERGED VANES AND COLLAR ON THE SCOUR REDUCTION AROUND CYLINDRICAL BRIDGE PIERS

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SHOJAEI P.; FARSADIZADEH D.; HOSEINZADEH DALIR A.

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Journal: Journal of Water and Soil Science Year:2011 | Volume:15 | Issue:57 Page(s): 23-33

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Title

EFFECTS OF COMBINED SUBMERGED VANES AND COLLAR ON THE SCOUR REDUCTION AROUND CYLINDRICAL BRIDGE PIERS

Author(s)

SHOJAEI P. | FARSADIZADEH D. | HOSEINZADEH DALIR A. | Issue Writer Certificate

Keywords

BRIDGE PIERQ1

COLLARQ2

SCOURINGQ2

SEDIMENT TRANSPORTQ2

SHEAR STRESSQ2

SUBMERGED VANESQ2

Abstract

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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APA: Copy

SHOJAEI, P., FARSADIZADEH, D., & HOSEINZADEH DALIR, A.. (2011). EFFECTS OF COMBINED SUBMERGED VANES AND COLLAR ON THE SCOUR REDUCTION AROUND CYLINDRICAL BRIDGE PIERS. WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES), 15(57), 23-33. SID. https://sid.ir/paper/15146/en

Vancouver: Copy

SHOJAEI P., FARSADIZADEH D., HOSEINZADEH DALIR A.. EFFECTS OF COMBINED SUBMERGED VANES AND COLLAR ON THE SCOUR REDUCTION AROUND CYLINDRICAL BRIDGE PIERS. WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES)[Internet]. 2011;15(57):23-33. Available from: https://sid.ir/paper/15146/en

IEEE: Copy

P. SHOJAEI, D. FARSADIZADEH, and A. HOSEINZADEH DALIR, “EFFECTS OF COMBINED SUBMERGED VANES AND COLLAR ON THE SCOUR REDUCTION AROUND CYLINDRICAL BRIDGE PIERS,” WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES), vol. 15, no. 57, pp. 23–33, 2011, [Online]. Available: https://sid.ir/paper/15146/en

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