Propeller Jet–Induced Suspended-Sediment Concentration
Publication: Journal of Hydraulic Engineering
Volume 142, Issue 4
Abstract
When subjected to a strong swirling jet flow induced by a rotating ship’s propeller, the bed of a waterway may undergo significant changes. These changes will not only cause instability to quay structures and damage the protection work of the beds/banks of rivers and canals, but also resuspend the bed sediment. The latter likely will pollute the water column and affect the aquatic life. In this study, the propeller-jet velocity and sediment-concentration profiles downstream of a propeller are measured using an acoustic Doppler velocity profiler and a suction device, respectively. The estimates obtained by using formulas for the axial velocity and four published methods for calculating the reference near-bed concentration of suspended sediment are compared with the experimental data. Moreover, the behavior underlying the temporal and spatial variations in seabed scour and sediment suspension is also investigated. A new set of equations for estimating the sediment concentration profiles is developed. The new equations generally yield reasonably good estimates of the reference concentration and Rouse number at the measurement locations within the scour hole and on the deposition mound. The proposed modified Rouse equation produces reasonable predictions that are consistent with the experimental data.
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Acknowledgments
The authors would like to thank the Maritime and Port Authority of Singapore, the Hamburg Port Authority, and the DHI-NTU Water & Environment Research Centre for funding this research. They also wish to thank Mr. Y. Xie for conducting the experiments.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 142 • Issue 4 • April 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Sep 21, 2014
Accepted: Sep 13, 2015
Published online: Dec 21, 2015
Published in print: Apr 1, 2016
Discussion open until: May 21, 2016
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