Experimental Investigation of Scour Induced by Twin-Propeller Wash
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 143, Issue 4
Abstract
Advancement of technology has improved the efficiency of marine trading activities through use of vessels equipped with twin propellers instead of a single propeller. The progression from a single propeller to twin propellers will certainly increase occurrences of scour unless protection measures are studied and designed accordingly. An experiment to model a ship’s twin-propeller wash was conducted on a flat noncohesive soil bed for observation of scour. The asymptotic scour profile was defined in the following four stages: (1) initial, (2) developing, (3) merging, and (4) asymptotic. An equation is proposed to relate the densimetric Froude number, clearance ratio, and reference time scale to the predicted maximum scour depth and area. The predicted equations were found to be highly correlated with the observed parameters.
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Acknowledgments
The authors extend their gratitude to the Ministry of Higher Education in Malaysia for financial support under UM/MOHE High Impact Research Grants H-1600-00-D000047 and H-1600-00-D000034. Also, the financial support provided by the Ministry of Education Malaysia (Fundamental Research Grant FRGS/2/2013/TK01/UNITEN/02/1) and the Ministry of Science, Technology and Innovation (MOSTI) Malaysia (Grant 06-02-03-SF0258) is greatly acknowledged.
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Information & Authors
Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 143 • Issue 4 • July 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Apr 18, 2016
Accepted: Nov 15, 2016
Published online: Feb 24, 2017
Published in print: Jul 1, 2017
Discussion open until: Jul 24, 2017
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