Numerical Modeling of Seabed Response to Combined Wave Current Loading

Abstract

In this paper, a numerical model is developed to study the dynamic response of a porous seabed to combined wavecurrent loadings. While the Reynoldsaveraged Navier–Stokes equations with kخµ turbulence closure scheme and internal wavemaker function are solved for the phenomenon of wavecurrent interaction, Biot's poroelastic “upâ€‌ 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 wavecurrent 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.