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 (Θw) or current (Θc). Transient liquefaction analysis in a fine sand seabed shows that the depth and area of liquefaction will increase when a following current exists.