The effect of 20% reduction in overlapping length of the upstream submerged vanes of bridge pier on bed topography in sharp 180 degree bend

Q: How can I download an article?

To download an article from SID, first log in to the site, search for the article title, and click on the 'Download Article' option.

Q: How can I download an ISI article?

To download an ISI article on SID, enter the keyword or article title in the search bar, view the relevant results, click on the desired article, and select the 'Download Article' option.

Q: How can I access the SID database?

To access the SID database, visit SID.ir, create an account, and log in to access scientific resources.

Q: Is downloading articles from SID free?

Some articles on SID are available for free, while others require payment. Details are specified on the article's page.

Abdi Chooplou ch.; VAGHEFI M.; Meraji S. H.

Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

Paper Information

Journal: Modares Civil Engineering journal Year:2019 | Volume:19 | Issue:2 Page(s): 41-55

Download Full-Text

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Persian Verion

View:

481

Download:

Cites:

Information Journal Paper

Title

The effect of 20% reduction in overlapping length of the upstream submerged vanes of bridge pier on bed topography in sharp 180 degree bend

Author(s)

Abdi Chooplou ch. | VAGHEFI M. | Meraji S. H. | Issue Writer Certificate

Keywords

Clear waterQ1

ScouringQ2

Bridge PierQ2

Submerged VanesQ1

Submerged Vanes Overlapping LengthQ1

Abstract

Local scour around Bridge Pier is one of the important problem in bridge stability against water flow that is created due to hole scour around Bridge Pier and castrates its stability. So as, providing methods for control and scour reduction around Bridge Pier have very importance. Yet different methods have been proposed for preventing and reducing the local Scouring around the Bridge Pier. Use of Submerged Vanes is one of the methods that researchers are interested in Submerged plates are thin rectangular structures that because of having angle with the flow direction, is created high pressure and low pressure region on both sides. These structures create a secondary vortex and change the flow pattern in the river bed and as a result, change the sediment and scour transmission. Submerged Vanes performance to reduce the Bridge Pier Scouring the sediment movement around the vanes due to the downward flow in front of them are affected by the layout of the plates. These vanes are designed in cross section of the channel and fixed with a little angle relative to flow direction perpendicularly on the bed. In this research, Submerged Vanes were used to reduce the local scour around the single bridged pier located in bend head. Effective variables in this study were vanes overlapping length, space of Submerged Vanes from Bridge Pier center and space of Submerged Vanes from each other perpendicular state on flow direction. For this purpose, a cylindrical Bridge Pier to diameter 5 cm in the laboratory was performed with a sharp bend 180 degree with central radius to channel width ratio equal 2, a width 1 meter and height 90 cm with straight direction length of bend upstream 6. 5m and straight direction length of bend downstream 5m in Clear water conditions ⁄ with water discharge of 70 liters per second and depth 17. 8 cm. The Submerged Vanes were Plexi Glass with width 1. 5 equal pier diagonal (7. 5cm), thickness equal 20% pier diagonal and located in 25 angle relative to horizon with height of out of bed 4. 5cm (submergence percent 0. 75) with sitting vanes center in the middle of channel (50% channel width from inner bank, with overlapping length (Lcv) 80 and 100% and intervals of Submerged Vanes from each other perpendicularly on flow direction 5 and 10cm (Lvv/D)=1. 2 in position 83 and 79. 5 degree from beginning of the bend (interval equal 5 and 7. 5 pier diameter toward upstream from located pier site) (Lvp/D=5, 7. 5). Also use of Submerged Vanes is transferred location of maximum scour depth to a place near than pier and limited width of scour hole around a pier. Furthermore, Submerged Vanes limit sedimentation region to 0-12% channel width from inner bank and in 70-127 degree from the beginning of the bend. Minimum and maximum scour in hole around pier with Submerged Vanes are created 0. 53 and 0. 65 equal flow depth at the beginning of the bend in V80-5-2 and V100-7. 5-1 Tests, respectively. The discussion about the results of this research is from the other parts of this paper. The highest and lowest sedimentation height in experiments with overlapping length 80 and 100 percent occur with deposition of vanes in distance of 7. 5 and 5 times pier diameter from it respectively, and 2 times pier diameter from each other, that is 0. 55 and 0. 44 times flow depth at the band beginning.

Cites

No record.

References

No record.

Cite

APA: Copy

Abdi Chooplou, ch., VAGHEFI, M., & Meraji, S. H.. (2019). The effect of 20% reduction in overlapping length of the upstream submerged vanes of bridge pier on bed topography in sharp 180 degree bend. MODARES CIVIL ENGINEERING JOURNAL, 19(2 ), 41-55. SID. https://sid.ir/paper/256749/en

Vancouver: Copy

Abdi Chooplou ch., VAGHEFI M., Meraji S. H.. The effect of 20% reduction in overlapping length of the upstream submerged vanes of bridge pier on bed topography in sharp 180 degree bend. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2019;19(2 ):41-55. Available from: https://sid.ir/paper/256749/en

IEEE: Copy

ch. Abdi Chooplou, M. VAGHEFI, and S. H. Meraji, “The effect of 20% reduction in overlapping length of the upstream submerged vanes of bridge pier on bed topography in sharp 180 degree bend,” MODARES CIVIL ENGINEERING JOURNAL, vol. 19, no. 2 , pp. 41–55, 2019, [Online]. Available: https://sid.ir/paper/256749/en

Related Journal Papers