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根据近岸地区波浪、潮流与泥沙运动的规律,把波浪运动概化为在潮周期中具有时均意义的波浪流分布场,将波浪辐射应力以及波流底部剪切应力耦合到潮流运动方程和悬沙输运方程中,建立了非结构网格下近岸波浪和潮流共同作用下的二维悬沙输运数值模型。时间离散采用欧拉向前格式,空间离散采用有限体积法的显式格式。将模型应用于矩形海湾实验和大连长兴岛附近海区悬沙冲淤过程的实际算例。结果表明:波浪对潮位影响很小,但是对近岸流速有较为明显的影响;波流共同作用对近岸泥沙浓度影响比单纯考虑潮流作用可提高40%～100%的幅度。
According to the laws of wave, tidal current and sediment movement in the nearshore area, the wave motion is generalized as a wave-field distribution field with mean-time significance in the tidal period. The wave radiation stress and the shear stress at the bottom of the wave flow are coupled to the flow equation And suspended sediment transport equations, a numerical model of two-dimensional suspended sediment transport under the combined effect of near-shore wave and tidal current under unstructured grids is established. The Euclidean forward format is used for the discrete time and the explicit format for the finite volume method is used for spatial discretization. The model is applied to the actual case study of the suspended sediment deposition in the rectangular bay experiment and the sea area near Changxing Island, Dalian. The results show that the wave has little effect on the tide level, but it has a more obvious effect on the near-shore flow rate. The effect of the wave interaction on the coastal sediment concentration can be increased by 40% ~ 100% compared with the simple consideration of the tidal current.