Scour Caused by a Propeller Jet
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VIEW CORRECTIONPublication: Journal of Hydraulic Engineering
Volume 139, Issue 9
Abstract
The scour hole induced by a propeller wash is experimentally investigated with noncohesive sediments. The associated scour profile at the asymptotic condition, which can be expressed by a combination of three polynomials, comprises (1) a small scour hole beneath the propeller, (2) a primary scour hole downstream of the small scour hole, and (3) a deposition mound farther downstream of the primary scour hole. The time-dependent maximum scour depth induced by propeller jets is closely related to the densimetric Froude number, a reference time scale, offset height relative to the propeller diameter, and sediment size. A semiempirical formula, which shows good agreement with the experimental data, is proposed to describe evolution of the maximum scour depth. An equation for the determination of the time to initiate scour is also proposed. Moreover, empirical equations for the maximum asymptotic scour depth induced by a propeller and three-dimensional submerged offset jets agree well with the experimental data. The critical condition for the initiation of scour caused by propeller and offset jets is also presented.
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Acknowledgments
The authors would like to thank the Maritime and Port Authority of Singapore (MPA), Hamburg Port Authority (HPA), and DHI-NTU Centre for funding this research. In addition, Indra Susanto, Neo Hui Shan, and Ang Xiu Xuan are gratefully acknowledged for their assistance in performing the experiments.
References
Aberle, J., and Söhngen, B. (2008). “Analysis of propeller jet induced scour.” Proc., Int. Conf. on Fluvial Hydraulics River Flow 2008, 1991–2000.
Ali, K. H. M., and Lim, S. Y. (1986). “Local scour caused by submerged wall jets.” Proc. Inst. Civ. Eng., London, 81(4), 607–645.
Bergh, H., and Cederwall, K. (1981)., Hydraulics Laboratory, Royal Institute of Technology, Stockholm, Sweden.
Bergh, H., and Magnusson, N. (1987). “Propeller erosion and protection methods used in ferry terminals in the port of Stockholm.” Permanent International Association of Navigation Congresses, Bull. No. 58, 112–120.
Blaauw, H. G., and van de Kaa, E. J. (1978). “Erosion of bottom and sloping banks caused by the screw race of manoeuvring ships.” Delft Hydraulics Laboratory, Delft, Netherlands, 1–12.
Chait, S. (1987). “Undermining of quay walls at South African ports due to the use of bow thrusters and other propeller units.” Permanent International Association of Navigation Congresses, Bull. No. 58, 107–110.
Chatterjee, S. S., Ghosh, S. N., and Chatterjee, M. (1994). “Submerged horizontal jet over erodible bed.” J. Hydraul. Div., 106(11), 1765–1782.
Chiew, Y. M., and Lim, S. Y. (1996). “Local Scour by a deeply submerged horizontal circular jet.” J. Hydraul. Eng., 122(9), 529–532.
Chin, C. O., Chiew, Y. M., Lim, S. Y., and Lim, F. H. (1996). “Jet scour around vertical pile.” J. Waterw. Port Coastal Ocean. Eng., 122(2), 59–67.
Dey, S., and Sarkar, A. (2006). “Scour downstream of an apron due to submerged horizontal jets.” J. Hydraul. Eng., 132(3), 246–257.
Hamill, G. A. (1987). “Characteristics of the screw wash of a manoeuvring ship and the resulting bed scour.” Ph.D. thesis, Queen’s Univ. of Belfast, Northern Ireland, UK.
Hamill, G. A. (1988). “The scouring action of the propeller jet produced by a slowly manoeuvring ship.” Permanent International Association of Navigation Congresses, Bull. No. 58, 85–110.
Hamill, G. A., Johnston, H. T., and Stewart, D. P. (1999). “Propeller wash scour near quay walls.” J. Waterw. Port Coastal Ocean. Eng., 125(4), 170–175.
Hamill, G. A., McGarvey, J. A., and Mackinnon, P. A. (1998). “A method for estimating the bed velocities produced by a ship’s propeller wash influenced by a rudder.” Proc., 26th Int. Conf. on Coastal Engineering, Copenhagen, Denmark, 3, 3624–3633.
Karki, R., Faruque, M. A. A., and Balachandar, R. (2007). “Local scour by submerged offset jets.” Water Manag., 160(3), 169–179.
Rajaratnam, N. (1981). “Erosion by plain turbulent jets.” J. Hydraul. Res., 19(4), 339–358.
Verhey, H. J. (1983). “The stability of bottom and banks subjected to the velocities in the propeller jet behind ships.” Delft Hydraulics Laboratory, Netherlands.
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Published In
Journal of Hydraulic Engineering
Volume 139 • Issue 9 • September 2013
Pages: 1003 - 1012
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Aug 15, 2012
Accepted: Feb 11, 2013
Published online: Feb 13, 2013
Discussion open until: Jul 13, 2013
Published in print: Sep 1, 2013
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