Until recently, wave and hydrodynamic properties in the cross-shore direction have been linked to accretive or erosive morphological evolution. However, various uncertainties remain, hindering the full understanding and accurate prediction of the transport direction and quantity of sediment transport in nearshore areas. In this study, we showed that flash rip currents (FRCs) could significantly amplify suspended sediment flushing out of the surf zone by greatly increasing advective flux, even under accretive wave conditions in a depth-integrated modeling framework. Compared to the case without FRCs, where only one-dimensional cross-shore direction waves and currents exist, FRC-driven seaward advective sediment flux increased by approximately O(10²) times under normal incoming waves on alongshore uniform beaches, at least for the tested wave and bathymetry conditions. To properly consider the role of FRCs in suspended sediment flushing, short wave related physics, such as nonhydrostatic pressure and frequency dispersion, had to be included. In addition, it was important to accurately predict not only wave properties but also local hydrodynamics that cause erosion and advection. Finally, uniform sandbars prevented beach erosion, even when FRCs occurred on uniform beaches, by dissipating the wave energy closely associated with FRC generation. Therefore, one-dimensional cross-shore direction approaches neglecting the role of FRC-driven sediment transport processes, which are closely related to short wave motions and occur in two-dimensional space, could lead to lower prediction accuracy.

直到最近，跨海岸方向的波浪和水动力特性一直与增生或侵蚀形态演化有关。然而，各种不确定因素仍然存在，阻碍了对近岸地区泥沙运移方向和运移量的充分认识和准确预测。在这项研究中，我们表明，即使在深度综合建模框架中的增生波条件下，闪流离岸流 (FRC) 也可以通过大大增加平流通量来显着放大冲出冲浪区的悬浮沉积物。与没有 FRC 的情况相比，只有一维跨岸方向波和洋流存在，FRC 驱动的向海平流沉积物通量增加了大约O (10 ²) 在海岸均匀海滩上正常入射波下的时间，至少在测试的波浪和测深条件下是这样。为了正确考虑 FRC 在悬浮泥沙冲刷中的作用，必须包括短波相关物理，例如非静水压力和频率色散。此外，重要的是不仅要准确预测波浪特性，还要准确预测导致侵蚀和平流的局部流体动力学。最后，均匀的沙洲通过消散与 FRC 生成密切相关的波浪能，防止了海滩侵蚀，即使 FRC 发生在均匀的海滩上。因此，忽略与短波运动密切相关并发生在二维空间的FRC驱动的泥沙输移过程的一维跨岸方向方法可能会导致较低的预测精度。