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Geomechanics and Engineering
  Volume 5, Number 6, December 2013, pages 595-611
DOI: http://dx.doi.org/10.12989/gae.2013.5.6.595
 


3D numerical model for wave-induced seabed response around breakwater heads
H.Y. Zhao, D.-S. Jeng, Y. Zhang, J.-S. Zhang, H.J. Zhang and C. Zhang

 
Abstract
    This paper presents a three-dimensional (3D) integrated numerical model where the wave-induced pore pressures in a porous seabed around breakwater heads were investigated. Unlike previous research, the Navier-Stokes equation is solved with internal wave generation for the flow model, while Biot's dynamic seabed behaviour is considered in the seabed model. With the present model, a parametric study was conducted to examine the effects of wave and soil characteristics and breakwater configuration on the wave-induced pore pressure around breakwater heads. Based on numerical examples, it was found that the wave-induced pore pressures at breakwater heads are greater than that beneath a breakwater. The wave-induced seabed response around breakwater heads become more important with: (i) a longer wave period; (ii) a seabed with higher permeability and degree of saturation; and (iii) larger angle between the incident waves and breakwater. Furthermore, the relative difference of wave-induced pore pressure between fully-dynamic and quasi-static solutions are larger at breakwater heads than that beneath a breakwater.
 
Key Words
    breakwater; seabed response; wave-seabed-structure interactions; Biot's poro-elastic "quasi-static" and "fully-dynamic" model; Navier-Stokes equations
 
Address
(1) H.Y. Zhao and D.-S. Jeng: Griffith School of Engineering, Griffith University Gold Coast Campus, Queensland, QLD 4222, Australia;
(2) D.-S. Jeng and Y. Zhang: Center for Marine Geotechnical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
(3) D.-S. Jeng, J.-S. Zhang and C. Zhang: State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, China;
(4) H.J. Zhang: Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, Jiangsu, China.
 

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