Evaluation of Effect of the Submerged Vanes and Slot on Reduction of Local Scour Around Bridge

Document Type : Original Article

Authors

1 M.Sc. , Water Engineering Department, College of Agriculture, Ferdowsi University of Mashhad

2 Water Engineering Department, Ferdowsi University of Mashhad, Iran

3 Associate Professor , Water Engineering Department, College of Agriculture, Ferdowsi University of Mashhad

Abstract

The past research has shown that many methods have been used to reduce the scouring around piers. But the use of submerged vanes and slots has not been considered. In this research assemble of double submerged vanes with various lengths and angles attack on pier scouring reduction were carried out.. The   submerged vanes were placed in four different positions (S1 to S4) relative to the pier head. The pier diameter was D=3 cm and the vanes length to the pier diameter ratio were: L/D= 0.33, 0.66 and 1. The angles of double vanes were 10,20,30,90 degrees corresponding to the flow direction. All tests were conducted on slot piers. The ration of width and height slots to pier diameter were 0.25 and 2 respectively. The results showed that using the slot pier can reduce the pier scouring about 21% , with submerged vanes with slotcan be more effective for reduction of pier scouring.  S1 and S3 positions showed best results in reducing the maximum scour depth compared to other positions. The maximum reduction of scouring was 86% in the third position (S3) when the length of vanes were 2 cm , and angles of double vanes were 10, 30, degrees corresponding to the flow direction.

Keywords

References

پرچمی، ل.، اصغری­پری، ا.، شفاعی بجستان،م. 1396.  بررسی آزمایشگاهی تاثیر شکل صفحات مستغرق بر آبشستگی پایه پل، نشریه دانش آب و خاک. 27. 1: 29-41.
 دبردانی،ا. 1388.بررسی تاثیر صفحات دوگانه مستغرق در کاهش و کنترل آبشستگی کنار پایه استوانه­ای. پایان­نامه کارشناسی ارشد. دانشگاه شهرکرد.
حسینی،س.ح.، حسین‌زاده­دلیر،ع.، فرسادی‌زاده،د.، ارونقی،ه و قربانی،م،ع. 1390. تاثیر توام صفحات مستغرق و طوق در کاهش پایه‌های مستطیلی با دماغه گرد. نشریه دانش آب و خاک. 22. 3: 87-101.
شریعتی،ح.، خداشناس،س.ر و اسماعیلی،ک. 1390.  بررسی آزمایشگاهی کارکرد طوق و شکاف بر میزان آبشستگی موضعی در پایه پل، نشریه مهندسی عمران دانشگاه فردوسی مشهد.  23. 1 : 85 – 93.
شجاعی،پ.، فرسادی­زاده،د.، حسین­زاده دلیر،د.، سلماسی،ف و قربانی،م.ع. 1391. کاربرد صفحات مستغرق درکاهش آبشستگی پایه استوانه­ای پل­ها. نشریه دانش آب وخاک.  22. 1: 91- 108.
قربانی ، ب، کریمی،ا. 1386، مقایسه اثر پره های دوگانه و تنها روی فرسایش در یک پایه استوانه ای، مجموعه مقالات ششمین کنفرانس هیدرولیک ایران، شهرکرد
Ahmed Mohamed,T., Noor,M.J., Ghazali,A.H and Huat,B.K. 2005. Validation of some bridge pier scour formulae using field data and laboratory data. American Journal of Environmental Science. 1.2: 119-125.
Alabi,P.D. 2006. Time development of local scour at bridge pier fitted with a collar. MSc. Thesis, University of Saskatchewan, Canada.
Chiew,Y.M and Mellville,B.W. 1987. Local scour around bridge piers. Journal of Hydraulic Research. 25.1: 15-26.
Ghorbani,B and Kells,J.A. 2008. Effect of submerged vanes on the scour occurring at a cylindrical pier. Journal of Hydraulic Research. 46.5: 610-619
Heidarpour,M. 2002. Control and reduction of local scour at bridge piers by using slot, International Conference on Fluvial Hydraulics. Louvain-la-Neuve, Belgium.
Jain,S.C and Fisher,E.E. 1980. Scour around bridge piers at high flow velocities. Journal of Hydraulic Division. 106.11: 1827-1842.
Lauchlan,CS. 1999. Pier scour counter measures, Ph.D Thesis, University of Auckland, New Zealand.
Raudkivi,A.J. 2002. Loose Boundary Hydraulics, Balkema, Rotterdam, The Netherlands.
Tafarojnoruz,A., Gaudio,R and CalominoF. 2012. Evaluation of flow-altering countermeasures against bridge pier scour. Journal of Hydraulic Engineering 138: 297-305.
Zarrati,A.R., Gholami,H and Mashahir,M,B. 2004. Aplication of collar to control scouring around rectangular bridge piers. Journal of Hydraulic Research.  42.1: 97-103.
Iranian Journal of Irrigation & Drainage
Volume 12, Issue 5 - Serial Number 71
January and February 2019
Pages 1097-1106

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