TY - JOUR T1 - Comparison of Bridge Piers Shapes According to Local Scour Countermeasures AU - Kashmoola, Abdulnaser AU - Ismael, Adnan AU - Suleıman, Saleh PY - 2019 DA - July JF - The Eurasia Proceedings of Science Technology Engineering and Mathematics JO - EPSTEM PB - ISRES Publishing WT - DergiPark SN - 2602-3199 SP - 171 EP - 180 VL - 6 LA - en AB - Comparisonof experimental study was carried out between bridge piers to find out the efficientbridge pier to countermeasures the local scour. In addition the present studyis to provide a new method to reduce scour depth in front of bridge pier .Theidea of this method is dependent on change the position of two piers (normalpier (10-4) cm and straight aero foil shaped pier) with respect to flowdirection (named after here as opposite bridge pier and opposite aero foilpier). The down flow deflected away from the front the opposite piers and thehorseshoe vortex becomes small and does not affect the piers.In the presentstudy five piers (normal pier (10-4), opposite pier (4-10), straight aero foil,opposite aero foil and circular) were tested under live-bed condition with flowintensity 58 l/sec. for duration 3 hrs. The velocity field measurements wereobtained using an Acoustic Doppler Velocimeter. The results showed that theopposite piers reduce the local scour around the piers. For opposite pier thereduction of scour depth was about 40% compared with normal pier and 54%compared with circular pier. The reduction of the scour hole volume was about83% compared with circular pier and 23.6% when normal pier compared withcircular. For opposite aero foil the maximum depth of scour reduced 58%compared with straight aero foil and 69% compared with circular pier. Thereduction of the scour hole volume was about 89% compared with circular pierand straight aero foil reduced scour hole volume about 27% when compared withcircular pier.It is clearly from the comparison that the opposite piers are effectivecountermeasures for reducing local scour depth and scour hole volume,especially opposite aero foil pier. We hope that the results of the presentstudy will be benefitted by the designers and engineers. KW - Bridge pier position KW - Scour reduction KW - Local scour KW - Aero foil pier CR - T. M. Muzzammil, Gangadharaiah and A.K. Gupta. (2004)"An experimental investigation of a horseshoe vortex induced by a bridge pier." Water Manage. 157: 109-119. Tafarojnoruz et al. (2012). “Evaluation of Flow-Altering Countermeasures against Bridge Pier Scour” Journal of. Hydraulic. Eng.138:297-305. Chen et al. (2012). Experimental investigation of the Flow Field around a Bridge Pier with Hooked collar" ICSE6 Paris - August 27-31A. Drysdale, DM (2008). 'The effectiveness of an aerofoil shaped pier in reducing down stream vortices and turbulence', University of Southern Queensland. ZM. Christensen. (2009). Reduction of Local Scour around Bridge Piers: Combined System of Aerofoil and Slot”, University of Southern Queenlan, Toowoomba. D. Gibson. (2010). Evaluating Comparative Perfommance of Various Shaped Bridge Pers: Experimental Investigation of Sediment Transport and Scouring" , University of Southern Queenlan. Melville, B.W. and Chiew, Y.M. (1999). Time scale for local scour at bridge piers. Journal of Hydraulic Engineering, ASCE, 125(1): 59-65. Ettema, R. (1980). Scour at bridge piers. PhD Thesis. University of Auckland, Auckland, New Zealand. Chiew, Y.M.( 1984). Local scour at bridge piers. PhD Thesis. University of Auckland, Auckland, New Zealand. Dey, S. (1995). Three-dimensional vortex flow field around a circular cylinder in a quasiequilibrium scour hole. Sadhana, Proc. Indian Acad. Sci., 20 : 771-785. Molinas, A. 2003. Bridge Scour in Non-uniform Sediment Mixtures and in Cohesive Materials: Synthesis Report. Report Nr. FHWA-RD-03-083. B. W.Melville and A.J. Raudkivi .(1997) "Flow Characteristics in Local scour at Bridge Piers", J. Hydr. Res. IAHR, 15, 373–380. UR - https://dergipark.org.tr/en/pub/epstem/issue//619666 L1 - https://dergipark.org.tr/en/download/article-file/807137 ER -