Research Papers: Ocean Engineering

Numerical Modeling of Seabed Response to Combined Wave-Current Loading

[+] Author and Article Information
J.-S. Zhang

State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,
Hohai University,
Nanjing 210098, China;
College of Harbor,
Coastal and Offshore Engineering,
Hohai University,
Nanjing 210098, China

Y. Zhang

Postgraduate Student
Center for Marine Geotechnical Engineering Research,
Shanghai Jiao Tong University,
Shanghai 200240, China

C. Zhang

Associate Professor
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,
Hohai University,
Nanjing 210098, China;
College of Harbor,
Coastal and Offshore Engineering,
Hohai University,
Nanjing 210098, China

D.-S. Jeng

Griffith School of Engineering,
Griffith University, Gold Coast Campus,
Southport, QLD, 4111, Australia
e-mail: jengd2@asme.org

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received January 12, 2012; final manuscript received December 12, 2012; published online March 28, 2013. Assoc. Editor: Colin Leung.

J. Offshore Mech. Arct. Eng 135(3), 031102 (Mar 28, 2013) (7 pages) Paper No: OMAE-12-1005; doi: 10.1115/1.4023203 History: Received January 12, 2012; Revised December 12, 2012

In this paper, a numerical model is developed to study the dynamic response of a porous seabed to combined wave-current loadings. While the Reynolds-averaged Navier–Stokes equations with k-ε turbulence closure scheme and internal wave-maker function are solved for the phenomenon of wave-current interaction, Biot's poro-elastic “u-p” model is adopted for the seabed response. After validated by the laboratory measurements, this model is applied for the investigation of the effects of waves and currents on the wave-current induced pore pressures. Furthermore, the effects of currents on maximum liquefaction depths of a porous seabed is examined, and it is concluded that the opposite currents will increase the liquefaction depth up to 30% of that without currents.

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Grahic Jump Location
Fig. 5

Effect of current velocity on resulted (a) wave height and (b) wavelength

Grahic Jump Location
Fig. 6

Effect of current velocity on (a) pore pressures and (b) maximum liquefied depth

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Fig. 4

Vertical distributions of the maximum pore pressure (|p|max/(0.5γwH)) versus soil depth (z/Hs) for various (a) wave periods and (b) wave height

Grahic Jump Location
Fig. 3

Comparison of simulated and measured horizontal-velocity profiles for both wave-alone and wave-current cases. °: measurement; –: simulation.

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Fig. 2

Comparison of simulated and measured water surface profile in W2 and WC2 cases. °: experimental measurement; –: numerical simulation.

Grahic Jump Location
Fig. 1

An illustrative sketch of computational domain and boundary conditions for wave-current mode




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