Coupled analysis for response and instability of sloping seabed under wave action |
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| Institution: | 1. Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China;2. Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China;3. College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China;4. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;1. School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran;2. Centre for Offshore Foundation Systems, University of Western Australia, Perth, Australia |
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| Abstract: | Wave-induced instability of seabed may cause damage to coastal and offshore structures. This issue has been investigated mostly for mildly sloping () seabed considering uncoupled or one-way coupled response of wave and seabed interaction. However, some of the marine structures are founded on seabed with steeper slopes. In this study, the wave-induced response and instability of sloping seabed are evaluated using a coupled finite element model. The interaction between fluid and porous seabed accounting for the effect of fluid motion on the seabed response, and conversely the effect of seabed response on the fluid motion (but not on the surface wave profile) is considered. The results indicate that the system response (fluid pressure, stresses, etc.) and the extent of instantaneously liquefied zone within the sloping seabed with significant steepness are lesser than those for horizontal seabed. Moreover, for typical sediment and wave characteristics, for the flat seabed, the response obtained from fully coupled analysis is not significantly different from those obtained by uncoupled analysis. For the sloping bed, such difference is slightly greater as compared to that for the flat bed. |
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| Keywords: | Wave-seabed interaction Slope instability Liquefaction analysis Finite element analysis |
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