Investigation of Scour Depth at Bridge Piers using Bri-Stars Model in Iran

Authors: Gh. Saeidifar, F. Raeiszadeh

Abstract:

BRI-STARS (BRIdge Stream Tube model for Alluvial River Simulation) program was used to investigate the scour depth around bridge piers in some of the major river systems in Iran. Model calibration was performed by collecting different field data. Field data are cataloged on three categories, first group of bridges that their rivers bed are formed by fine material, second group of bridges that their rivers bed are formed by sand material, and finally bridges that their rivers bed are formed by gravel or cobble materials. Verification was performed with some field data in Fars Province. Results show that for wide piers, computed scour depth is more than measured one. In gravel bed streams, computed scour depth is greater than measured scour depth, the reason is due to formation of armor layer on bed of channel. Once this layer is eroded, the computed scour depth is close to the measured one.

Keywords: BRI-STARS, local scour, bridge, computer modeling

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1083747

References:

[1] J. E. Richardson, V. G. Panchang, and E. Kent, "three dimensional numerical simulation of flow around bridge sub-structure," ASCE proceedings of stream stability and scour at highway bridges, edit by Richardson E. V. and Lagasse F. 1998.
[2] S. E., Coleman, , "clearwater local scour at complex piers" Journal of Hydraulic Engineering, Vol. 131, No. 4, pp. 330-334. .2005.
[3] Z. Bozkus, and O. Yildiz, "effects of inclination of bridge piers on scouring depth" Journal of Hydraulic Engineering, Vol. 130, No. 8, pp. 827-832. 2004.
[4] Md. F. Mia, "design method of time-dependent local scour at circular bridge pier" Journal of Hydraulic Engineering, Vol. 129, No. 6, pp. 420-427, 2003.
[5] D. M. Sheppard, M. Odeh, and T. Glasser, , "large scale clear-water local pier scour experiments" Journal of Hydraulic Engineering, Vol. 130, No. 10, pp. 957-963. 2004.
[6] P. A. Johnson, and S. L. Niezgoda, "risk-based method for selecting bridge scour countermeasures" Journal of Hydraulic Engineering, Vol. 130, No. 2, pp. 121-128, 2004.
[7] H. H. Chang, M. E. Jennings, and S. Olona, "Computer simulation of river changes at bridge crossing on point bar", ASCE proceedings of stream stability and scour at highway bridges, edit by Richardson E. V. and Lagasse F. 1998.
[8] J. Peng, Y. Kawahara, and N. Tamai, "numerical analysis of threedimensional turbulent flows around bridge submerged groins", ASCE proceedings of stream stability and scour at highway bridges, edit by Richardson E. V. and Lagasse F. 1998.
[9] R. Ettema, B. W. Melville, and B. Raudkivi, , "pier width and local scour depth", ASCE comp. of conf. scour paper Reton.V.A. 1998.
[10] B. Ghorbani, "Investigation of existing computational methods to determine scour depth around hydraulic structures and selection of suitable method in Fars Rivers", MS Thesis presented to irrigation department, Shiraz University. 1989.
[11] N. P. Wallterstein, and C. R. Thorne, "computer model for prediction of scour at bridge pier by large debries" ASCE proceedings of stream stability and scour at highway bridges, edit by Richardson E. V. and Lagasse F. 1998.