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.
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© 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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