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http://dx.doi.org/10.12989/gae.2013.5.6.595

3D numerical model for wave-induced seabed response around breakwater heads  

Zhao, H.Y. (Griffith School of Engineering, Griffith University Gold Coast Campus)
Jeng, D.S. (Griffith School of Engineering, Griffith University Gold Coast Campus)
Zhang, Y. (Center for Marine Geotechnical Engineering, Shanghai Jiao Tong University)
Zhang, J.S. (State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University)
Zhang, H.J. (Faculty of Civil Engineering and Mechanics, Jiangsu University)
Zhang, C. (State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University)
Publication Information
Geomechanics and Engineering / v.5, no.6, 2013 , pp. 595-611 More about this Journal
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.
Keywords
breakwater; seabed response; wave-seabed-structure interactions; Biot's poro-elastic "quasi-static" and "fully-dynamic" model; Navier-Stokes equations;
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