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

2018
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.

Keywords
local scour countermeasure, nose-angle pier, skew angle
DOI
10.7250/bjrbe.2018-13.405
Hyperlink
https://bjrbe-journals.rtu.lv/article/view/bjrbe.2018-13.405

Habib, I., Mohtar, W., Elsaiad, A., El-Shafie, A. Nose-Angle Bridge Piers as Alternative Countermeasures for Local Scour Reduction. The Baltic Journal of Road and Bridge Engineering, 2018, Vol. 13, No. 2, pp. 110-120. ISSN 1822-427X. e-ISSN 1822-4288. Available from: doi:10.7250/bjrbe.2018-13.405

Publication language
English (en)