Nose-Angle Bridge Piers as Alternative Countermeasures for Local Scour Reduction

Ibtesam Abudallah Habib, Wan Hanna Melini Wan Mohtar, Atef Elsaiad, Ahmed El-Shafie


This study investigates the performance nose-angle piers as countermeasures for local scour reduction around piers. Four nose angles were studied, i.e., 90°, 70°, 60° and 45° and tested in a laboratory. The sediment size was fixed at 0.39 mm whereas the flow angle of attack (or skew angle) was varied at four angles, i.e., skew angles, i.e., 0°, 10°, 20° and 30°. Scour reduction was clear when decreasing nose angles and reached maximum when the nose angle is 45°. Increasing the flow velocity and skew angle was subsequently increasing the scour profile, both in vertical and transversal directions. However, the efficiency of nose angle piers was only high at low Froude number less than 0.40 where higher Froude number gives minimal changes in the maximum scour depth reduction. At a higher skew angle, although showed promising maximum scour depth reduction, the increasing pier projected width resulted in the increase of transversal lengths.


local scour countermeasure; nose-angle pier; skew angle

Full Text:



Akib, S., Liana Mamat, N., Basser, H., & Jahangirzadeh, A. (2014). Reducing local scouring at bridge piles using collars and geobags. The Scientific World Journal, 2014.

Beg, M., & Beg, S. (2013). Scour reduction around bridge piers: a review. International Journal of Engineering Inventions, 2(7), 7–15.

Chiew, Y. M., & Melville, B. M. (1987). Local scour around bridge piers. Journal of Hydraulic Research, 25(1), 15–26.

Chiew, Y. M. (1992). Scour protection at bridge piers. Journal of Hydraulic Engineering, 118(9), 1260–1269.

Ferraro, D., Tafarojnoruz, A., Gaudio, R., & Cardoso, A. H. (2013). Effects of pile cap thickness on the maximum scour depth at a complex pier. Journal of Hydraulic Engineering, 139(5), 482– 491.

Grimaldi, C., Gaudio, R., Cardoso, A. H., & Calomino, F. (2006). Local scouring at bridge piers and abutments: time evolution and equilibrium. Proceedings of 3rd International Conference on Fluvial Hydraulics (pp. 1657–1664).

Gupta, A. K., & Gangadharaiah, T. (1992). Local scour reduction by a delta wing-like passive device. Proceedings of the 8th Congress of Asia & Pacific Regional Division. Vol. 2. Pune, India.

Habib, I. A. M. (2007). Study the local scour around bridge piers (sloped noses and skew angles) (Master Thesis). Al-Marigb University, Al-Khoms, Libya.

Kumar, V., Raju, K. G. R., & Vittal, N. (1999). Reduction of local scour around bridge piers using slots and collars. Journal of hydraulic engineering, 125(12), 1302–1305.

Lagasse, P. F., Clopper, P. E., & Zevenbergen, L. W. (2007). Countermeasures to protect bridge piers from scour. NCHRP Report 593, Transportation Research Board, National Academies of Science, Washington, D.C.

Lin, Y. B., Chen, J. C., Chang, K. C., Chern, J. C., & Lai, J. S. (2004). Real-time monitoring of local scour by using fiber Bragg grating sensors. Smart materials and structures, 14(4), 664.

National Transportation Safety Board. (1990). Highway accident report. Retrieved from summary/HAR900/html

Ross, H., Sicking, D, Zimmer, R., and Michie, J. (1993). Recommended procedures for the safety performance evaluation of highway features. National Cooperative Highway Research Program, Report 350. Transportation Research Board, National Academy Press.

Richardson, E. V., & Davis, S. R. (2001). Evaluating scour at bridges (4th ed.). Federal Highway Administration Hydraulic Engineering Circular No.18, FHWA NHI 01-001.

Odgaard, A. J., & Wang, Y. (1987). Scour prevention at bridge piers. In Hydraulic Engineering (pp. 523-527). ASCE.

Yoon, T. H., & Kim, D. H. (2001). Bridge pier scour protection by sack gabions. In Bridging the Gap: Meeting the World’s Water and Environmental Resources Challenges (pp. 1–8). American Society of Civil Engineers (ASCE).

Zarrati, A. R., Nazariha, M., & Mashahir, M. B. (2006). Reduction of local scour in the vicinity of bridge pier groups using collars and riprap. Journal of Hydraulic Engineering, 132(2), 154–162.

DOI: 10.7250/bjrbe.2018-13.405


  • There are currently no refbacks.

Copyright (c) 2018 Ibtesam Abudallah Habib, Wan Hanna Melini Wan Mohtar, Atef Elsaiad, Ahmed El-Shafie

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.