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HHT Analysis on Pore Pressure Dissipation of Wave-Induced Fluidization in a Sandy Bed

[+] Author Affiliations
Shiaw-Yih Tzang, Yung-Lung Chen

National Taiwan Ocean University, Keelung, Taiwan

Shan-Hwei Ou

Tajen University, Pingtung, Taiwan

Paper No. OMAE2011-49555, pp. 923-929; 7 pages
doi:10.1115/OMAE2011-49555
From:
  • ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 7: CFD and VIV; Offshore Geotechnics
  • Rotterdam, The Netherlands, June 19–24, 2011
  • ISBN: 978-0-7918-4439-7
  • Copyright © 2011 by ASME

abstract

Wave-induced pore pressure variations during the stage of increasing excess pore pressure consist of the mechanism of generation of fluidization. Moreover, in post-fluidization stage, pore pressure variations not only reveal the dissipation mechanism of fluidization but also the wave-fluidized bed interactions. Past results from a series of lab flume tests have further illustrated that pore pressure variations in a fluidized response are nonlinear and nonsataionary. Hence, the HHT method was further applied to analyze the pore pressure measurements in this study. The results demonstrate that after the dissipation of excess pore pressures the amplitudes of fundamental and higher-frequency components begin to decay. Meanwhile, the amplified amplitudes of fundamental and higher-frequency components during fluidization response would decrease with decreasing thickness of fluidized soil-layer in consecutive tests.

Copyright © 2011 by ASME

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