CONTROL OF LOCAL SCOUR AT A BRIDGE ABUTMENT USING A PROTECTIVE PILE | ||||
| JES. Journal of Engineering Sciences | ||||
| Article 4, Volume 42, No 4, July and August 2014, Page 956-967 PDF (401.22 K) | ||||
| DOI: 10.21608/jesaun.2014.115040 | ||||
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| Author | ||||
| Elnikhely E.A. | ||||
| Water and Water Str. Eng. Dep., Faculty of Engineering, Zagazig University, Zagazig, Egypt | ||||
| Abstract | ||||
| Various methods are proposed to control scouring around a bridge abutment. In this study, experiments were conducted at a vertical wall abutment in a laboratory flume to explore the effect of using a protective pile installed upstream the abutment for reducing the effects of local scour aroundthe bridge abutment. Tests were conducted with different pile diameters and positions under the same flow conditions. In addition, a 3-D numerical model was used to simulate the scour at the bridge abutment. The model used a finite-volume method to solve the non-transient Navier-Stocks equations and a bed load conservation equation. The k-ɛ turbulence model was used to solve the Reynolds-stress term. The 3-D flow model was verified by comparing the obtained results with the experimental results. It was found from this research study that, the optimum case of pile is (D/B=0.125, x/B=0.25, b/B=1.0), it reduced the relative scour depth by about 41%. The results showed a good agreement between simulation and experimental data. Also, an empirical equation was developed from the experimental results for computing the maximum scour depth at a bridge abutment with a protective pile. | ||||
| Keywords | ||||
| Scour; bridge abutment; numerical modeling; protective pile | ||||
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