Study of the time-dependent clear water scour around circular bridge piers

Aysegul Ozgenc Aksoy 1 , Gokcen Bombar 2 , Tanıl Arkis 1  and Mehmet Sukru Guney 1
  • 1 Civil Engineering Department, Dokuz Eylul University, Tinaztepe Campus, Izmir, Turkey
  • 2 Civil Engineering Department, Ege University, Bornova, Izmir, Turkey


The local scour around bridge piers influences their stabilities and plays a key role in the bridge failures. The estimation of the maximum possible scour depth around bridge piers is an important step in the design of the bridge pier foundations. In this study, the temporal evolution of local scour depths as well as the equilibrium scour depths were analyzed.

The experiments were carried out in a rectangular flume by using uniform sediment with median diameter of 3.5 mm and geometric standard deviation of 1.4. The diameters of the tested circular bridge piers were 40 mm, 80 mm, 150 mm and 200 mm. The flow and scour depths were determined by ultrasonic sensors. The experiments were realized in clear water conditions with various constant flow rates.

The experimental findings were compared with those calculated from some empirical equations existing in the literature. A new empirical relation involving the flow intensity, the relative water depth and the dimensionless time is also introduced. The advantage of this proposed relation is that the only parameter requiring the calculation is the critical velocity, other parameters being known geometric and hydraulic parameters. The performance of this relation was tested by using experimental data available in the literature, and a satisfactory compatibility was revealed between the experimental and numerical results.

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  • Breusers, H.N.C., Nicollet, G., Shen, H.W., 1977. Local scour around cylindrical piers. Journal of Hydraulic Resources, 15, 3, 211-252.

  • Chang, W.Y., Lai, J.S., Yen, C.L., 2004. Evolution of scour depth at circular bridge piers. Journal of Hydraulic Engineering, 130, 9, 905-913.

  • Guney, M.S., Bombar, G., Aksoy, A.O., Dogan, M., 2013. Use of ultrasonic velocity profiler (UVP) to investigate the evolution of bed configuration. KSCE Journal of Civil Engineering, 17, 5, 1-10.

  • Hancu, S., 1971. Sur le calcul des affouillements locaux dans la zone des piles des ponts. In: Proc. 14th AHR Congr. Int. Assn. for Hydr. Res. (IAHR), Paris, France, Vol. 3, pp. 299-313.

  • Kothyari, U.C., Garde, R.J., Ranga Raju, K.G., 1992. Temporal variation of scour around circular bridge piers. Journal of Hydraulic Engineering, 118, 8, 1091-1106.

  • Kothyari, U.C., Hager, W.H., Oliveto, G., 2007. Generalized approach for clear-water scour at bridge foundation elements. Journal of Hydraulic Engineering, 133, 11, 1229-1240.

  • Melville, B.W., 1997. Pier and abutment scour: Integrated approach. Journal of Hydraulic Engineering, 123, 2, 125-136.

  • Melville, B.W., Chiew, Y.M., 1999. Time scale for local scour at bridge piers. Journal of Hydraulic Engineering, 125, 1, 59-65.

  • Melville, B.W., Sutherland, A.J., 1988. Design method for local scour at bridge piers. Journal of Hydraulic Engineering, 114, 10, 1210-1226.

  • Mia, F., Nago, H., 2003. Design method of time-dependent local scour at circular bridge pier. Journal of Hydraulic Engineering, 129, 6, 420-427.

  • Oliveto, G., Hager, W.H., 2002. Temporal evolution of clearwater pier and abutment scour. Journal of Hydraulic Engineering, 128, 9, 811-820.

  • Oliveto, G., Hager, W.H., 2005. Further results to timedependent local scour at bridge elements. Journal of Hydraulic Engineering, 131, 2, 97-105.

  • Richardson, E.V., Davis, S.R., 2001. Evaluating Scour at Bridges. 4th Ed. Hydraulic Engineering Circular No. 18, Federal Highway Administration Publication No. FHWANHI 01-001, Washington, DC, 376 p.

  • Sheppard, D.M., Miller, W., 2006. Live-bed local pier scour experiments. Journal of Hydraulic Engineering, 132, 7, 635-642.

  • Sheppard, D.M., Odeh, M., Glasser, T., 2004. Large scale clearwater local pier scour experiments. Journal of Hydraulic Engineering. 130, 10, 957-963.

  • Simarro, G., Fael, C., Cardoso, A., 2011. Estimating equilibrium scour depth at cylindrical piers in experimental studies. Journal of Hydraulic Engineering, 137, 9, 1089-1093.

  • Yanmaz, M., Altinbilek, H.D., 1991. Study of time-dependent local scour around bridge piers. Journal of Hydraulic Engineering, 117, 10, 1247-1268.


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