Viscous Wave Interaction Due to Motion of a Surface Wave Over a Sediment Bed

[+] Author and Article Information
Mirmosadegh Jamali

Department of Civil Engineering, Sharif University of Technology, Azadi Avenue, P. O. Box 11365-9313, Tehran, Iranjamali@sharif.edu

Gregory A. Lawrence

Department of Civil Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canadalawrence@civil.ubc.ca

J. Offshore Mech. Arct. Eng 128(4), 276-279 (Apr 28, 2006) (4 pages) doi:10.1115/1.2217753 History: Received May 30, 2005; Revised April 28, 2006

The results of a flume experiment and a theoretical study of surface wave motion over a fluidized bed are presented. It is shown that a resonant wave interaction between a surface wave and two interfacial waves at the interface of the fresh water and the fluidized bed is a strong mechanism for instability of the interface and the subsequent mixing of the layers. The interfacial waves are subharmonic to the surface wave and form a standing wave at the interface. The interaction is investigated theoretically using a viscous interaction analysis. It is shown that surface wave height and viscous effects are the determining factors in the instability mechanism. The results indicate that the net effect of viscosity on the interaction is to suppress the interfacial waves.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Images of the test section at intervals of one surface wave period

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Figure 2

Images of the water-sediment column (a) at the start of the experiment, (b) during the fluidization process, (c) during the interfacial wave growth, and (d) at the end of the experiment

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Figure 3

Configuration of the problem

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Figure 4

Variations of Re[α]a0∕ω0, β∕ω0, and γ∕ω0 with ν∕(gH3)1∕2



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