International Science Index


9999958

Prediction of Scour Profile Caused by Submerged Three-Dimensional Wall Jets

Abstract:

Series of laboratory tests were carried out to study the extent of scour caused by a three-dimensional wall jets exiting from a square cross-section nozzle and into a non-cohesive sand beds. Previous observations have indicated that the effect of the tail water depth was significant for densimetric Froude number greater than ten. However, the present results indicate that the cut off value could be lower depending on the value of grain size-to-nozzle width ratio. Numbers of equations are drawn out for a better scaling of numerous scour parameters. Also suggested the empirical prediction of scour to predict the scour centre line profile and plan view of scour profile at any particular time.

References:
[1] Faruque, M. A. A., Sarathi, P., and Balachandar, R. (2006). “Clear water local scour by submerged three-dimensional wall jets: Effect of tailwater depth.” Journal of Hydraulic Engineering, 132(6), 575-580.
[2] Rajaratnam, N. (1981). “Erosion by plane turbulent jets.” Journal of Hydraulic Research, Vol. 19, No. 4, pp.339-358.
[3] Ade, F. and Rajaratnam, N. (1998), “Generalized study of erosion by circular horizontal turbulent jets”, Journal of Hydraulic Research, Vol. 36, No. 4, pp.613-635.
[4] Ali, K. H. M., and Lim, S. Y. (1986). “Local scour caused by submerged wall jets.” Proc. of the Instn. of Civil Engrs., Part 2, 81, pp.607-645.
[5] Lim, S. Y. (1995). “Scour below unsubmerged full-flowing culvert outlets.” Proc. of the Institution of Civil Engineers, Water Maritime and Energy, Vol. 112, pp.136-149.
[6] Rajaratnam, N., and Diebel, M. (1981). “Erosion below culvert-like structures.” Proc., 5thCanadianHydrotechnical Conf., May26–27, Canadian Society for Civil Engineering (CSCE), pp.469-484.
[7] Rajaratnam, N. and Macdougall, R.K. (1983), “Erosion by plane wall jets with minimum tailwater”, Journal of Hydraulic Engineering, Vol. 109, No. 7, pp.1061-1064.
[8] Chiew, Y.M. and Lim, S.Y. (1996), “Local scour by a deeply submerged horizontal circular jet”, Journal of Hydraulic Engineering, Vol. 122, No. 9, pp.529-532.
[9] Aderibigbe, O., and Rajaratnam, N. (1998). “Effect of sediment gradation on erosion by plane turbulent wall jets.” Journal of Hydraulic Engineering, Vol. 124, No. 10, pp.1034-1042.
[10] Rajaratnam, N., and Berry, B.(1977). “Erosion by circular turbulent wall jets.” Journal of Hydraulic Research, Vol. 15, No. 3, pp.277-289.