Rip currents have become one of the primary coastal hazards globally. In the present work, the dynamics of a multichannel rip system are revealed by a group of numerical simulations over truncated sandbar bathymetry under varying wave conditions. It is found that increasing wave height may disperse rip currents due to strong wave-current shear in opposite directions and the resulting microbreaking, which is contrary to the widely accepted proportional theory. The pump-feed phenomenon between adjacent channels shows that rip currents might be absent in small channels when water flows through neighboring broader pathways. Rip currents are indicated highly sensitive to wave direction and deflect into undulant alongshore currents around sandbars as waves deviate from normal incidence. The decay of rip currents with wave angle did not show a clear dependence on channel width, which was found in previous studies. Vortices usually appear near bar-channel edges and by sides of rip currents. The magnitude of the vortex is not explicitly related to the wave height but increases with the wave angle. The water setup shoreward by sandbars substantially increases with wave angle, while the surface depression over rip channels is less observed. This indicates a lower pressure differential to drive feeder flows toward the channels and explains why rip currents cannot persist when incident waves become slightly oblique.

洋流已成为全球主要的沿海灾害之一。在当前的工作中，通过在变化的波浪条件下通过截断的沙洲测深法进行的一组数值模拟，揭示了多通道裂隙系统的动力学。已经发现，由于强烈的波流剪切力在相反的方向以及由此引起的微破裂，增加的波高可能会分散裂隙电流，这与被广泛接受的比例理论相反。相邻通道之间的泵送现象表明，当水流过相邻的较宽通道时，在小通道中可能没有裂隙电流。表示浪潮电流对波浪方向高度敏感，并且当波浪偏离法线入射时，会偏转到沙洲周围的波浪状岸边电流中。波动电流随波角的衰减没有显示出对通道宽度的明显依赖性，这在先前的研究中已经发现。涡流通常出现在条形通道的边缘附近以及在裂变电流的两侧。涡旋的大小与波高没有明显关系，而是随波角的增加而增加。沙洲向岸的结水随着波浪角的增加而大大增加，而在裂隙河道上的地表凹陷则很少被观察到。这表明驱动送料器流向通道的压力差较低，并解释了当入射波略微倾斜时为何裂隙电流无法持续的原因。涡旋的大小与波高没有明显关系，而是随波角的增加而增加。沙洲向岸的结水随着波浪角的增加而大大增加，而在裂隙河道上的地表凹陷则很少被观察到。这表明驱动送料器流向通道的压力差较低，并解释了当入射波略微倾斜时为何裂隙电流无法持续的原因。涡旋的大小与波高没有明显关系，而是随波角的增加而增加。沙洲向岸的结水随着波浪角的增加而大大增加，而在裂隙河道上的地表凹陷则很少被观察到。这表明驱动送料器流向通道的压力差较低，并解释了当入射波略微倾斜时为何裂隙电流无法持续的原因。