Effect of Mutual Interference of Bridge Piers on Scouring in Meandering Channel

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DOI: https://doi.org/10.30564/hsme.v4i2.4692

Abstract:

Local scour is the reduction of original bed level around any hydraulic structure. Bridge failure due to scouring has made researchers study the cause of scouring and predict the scour depth and pattern around bridge piers and foundations. Several investigators have extensively studied local scour around isolated bridge pier, but modern designs of the bridges comprise of wide span and thus group of piers rather than a single pier. The flow and scour pattern around group of piers are different from the case of a single pier due to the interaction effect. The objective of present study is to investigate the effect of mutual interference of bridge piers on local scour experimentally around two piers in non-cohesive bed. Experiments were carried out on model bridge piers of circular cross section in a meandering channel. It was observed that when front and rear piers were placed at an angular displacement of θ = 40° and 80° respectively, maximum depth of scour is maximum. Here θ is the angle the line drawn at the inlet of bend to the line joining the centre of curvature and any point on the outer portion of the bend.

References:

[1]Melville, B.W., Sutherland, A.J., 1988. Design method for local scour at bridge piers. Journal of Hydraulic Engineering. 114, 1210-1226. [2]Debnath, K., Chaudhuri, S., 2010. Bridge Pier Scour in Clay-Sand Mixed Sediments at Near-Threshold Velocity for Sand. Journal of Hydraulic Engineering. 136(9), 597-906. [3]Garde, R.J., Kothiari, U.C., 1997. Scour around bridge piers. 6(4), 569-580. [4]Garde, R.J., Raju, K.G.R., 2014. Mechanics of Sediment Transportation and Alluvial Stream Problems. New Age International (P) Ltd,. Publishers. [5]Ting, F.C.K., Briaud, J.L., 2001. Flume Tests for Scour in Clay at Circular Piers. Journal of Hydraulic Engineering. 127(11), 969-978. [6]Elsebaie, I.H., 2013. An Experimental Study of Local Scour Around Circular Bridge Pier in Sand Soil. International Journal of Civil & Environmental Engineering. 13(1), 23-28. [7]Emami, Y., Salamatian, S.A., Ghodsian, M., 2008. Scour at Cylindrical Bridge Pier in a 180 Degree Channel Bend, Fourth International Conference on Scour and Erosion. pp. 256-262. [8]Masjedi, A., Bejestan, M.S., Kazemi, H., 2010. Effects of Bridge Pier Position in a 180 Degree Flume Bend on Scour Hole Depth. Journal of Applied sciences. 10(8), 670-675. [9]Elsaeed, G., Elsersawy, H., Ibraheem, M., et al., 2015. Determination of Scour holes around Bridge piers in meandering Channels. Journal of International Association of Advanced Technology and Science. 16(9), 1-12. [10]Ajeel, S., Gholami, A., Bonakdari, H., et al., 2016. Comparison of flow pattern in a 60° sharp bend by using Fluent software and artificial neural network, support Vector Machine Methods, Mesopotamia Environmental Journal. 2(2), 27-39. [11]Matooq, J.S., Mahmood, E.S., 2017. Local Scour around Single Central Oblong Bridge Piers Located within 180° Bend. Journal of Hydraulic Engineering. [12] Matooq, J.S., Mahmood, E.S., 2018. Local Scour around single Central Circular Bridge Pier located within 180o Bend. Journal of Engineering and Applied Sciences. 13(5), 1639-1648.