Study of scour due to local narrowing of the canal near the bridge abutment

Journal of Water Science & Engineering

دوره 9، شماره 25، بهمن 2019، صفحه 73-65   

نوع مقاله: Original Article

نویسندگان

سینا شیر محمدی؛ ابراهیم نوحانی^*

چکیده

Bridge pillar in the bed of a canal reduces the cross-sectional area and shrinks the flow. In such conditions, in addition to local scouring of the structural support, the necessary ground for the occurrence of contractile scouring phenomenon is also provided. The aim of this study was to investigate the effect of narrowing on the scour of the bridge abutment due to narrowing with different angles. For this purpose, three tightening angles with angles of 30, 60 and 90 degrees were considered and the supports were examined in three positions, beginning, middle and end. The results showed that by reducing the angle of collision, the scour depth decreases and the application of the gap reduces the scour of the abutment by a percentage compared to the abutment without the gap.

کلیدواژه‌ها

scour؛ narrowing؛ bridge abutment؛ laboratory model

مراجع

شفاعی بجستانی، م. (1373). هیدرولیک رسوب. انتشارات دانشگاه شهید چمران اهواز.

رضاپوریان، س.، قربانی، ب. و صمدی بروجنی، ح. (1388). مطالعه آزمایشگاهی تأثیر فاصله قرارگیری سری پره‎های مستغرق درکاهش آب‎شستگی موضعی پایه پل استوانه‎ای. هشتمین سمینار بین‎المللی مهندسی رودخانه. دانشگاه شهید چمران اهواز. 6 بهمن 1388، اهواز، ایران.

 

Chang, W.Y., Constantinescu, G., Lien, H.C., Tsai, W.F., Lai, J.S. and Loh, C.H. (2013). Flow structure around bridge piers of varying geometrical complexity. Journal of Hydraulic Engineering, 139(8), pp: 812-826.

Diab, R., Link, O. and Zanke, U. (2010). Geometry of developing and equilibrium scour holes at bridge piers in gravel. Canadian Journal of Civil Engineering, 37(4), pp: 544-552.

Ghorbani, B. and Kells, J.A. (2008). Effect of submerged vanes on the scour occurring at a cylindrical pier. Journal of Hydraulic Engineering, 46(5), pp: 610-619.

Heidarpour, M., Afzalimehr, H. and Izadinia, E. (2010). Reduction of local scour around bridge pier groups using collars. International Journal of Sediment Research, 25(4), pp: 411-422.

 

Keshavarzi, A., Hamidifar, H. and Khajehnouri, L. (2019). Mean flow structure and local scour around single and two column bridge piers. Irrigation Sciences and Engineering, 42(4), pp: 75-90.

Keykhee, M., Heidarpour, M. and Mousavi, S.F. (2009). Investigation of riprap pattern in the vicinity of bridge piers group. Journal of Water and Soil Science, 13(3), pp: 13-29.

Memar, S., Zounemat Kermani, M., Rahimpour, M., Beheshti, A.A. and Schleiss, A.J. (2019). An investigation on the impacts of the skew angle on two bridge piers with respect to the flow direction on the equilibrium scour depth at the piers front. Journal of Hydraulics, 14(1), pp: 107-121.