Wen, F.; Wang, J.H., and Zhou, X.L. 2016. Response of saturated porous seabed under combined short-crested waves and current loading.

Ocean currents and waves generally coexist in a real ocean environment. However, most previous investigations have only considered wave loading or have been limited to two-dimensional cases. In this study, first we derive interaction of short-crested waves and uniform currents. Then, based on Biot's consolidation (i.e. quasi-static) theory, we establish a numerical model integrating a three-dimensional model of the seabed with combined short-crested waves and current loading. Applying the proposed numerical model, we examine the influence of current on seabed response. Numerical results reveal that current has a significant effect on seabed response. For example, a following current (current in the x direction, U₁ > 0) will increase pore pressure, while an opposing current (current in the x direction, U₁ < 0) will decrease pore pressure. The maximum relative difference of pore pressure (Δp/p₀) can be more than 30% when a following current is considered. A parametric study demonstrates that the effects of current on the seabed response will be more significant in the cases of larger incident angles of wave (Θ_w) or current (Θ_c). Transient liquefaction analysis in a fine sand seabed shows that the depth and area of liquefaction will increase when a following current exists.