The surf zone eddies play a vital role in material transport, coastal morphology, and ecological environment. However, the formation mechanisms and evolution characteristics of surf zone eddies, especially their spatiotemporal evolution under strong wave-induced currents, remain insufficiently understood. This study integrates pollutant tracer experiments and numerical simulations using the Funwave model based on the Boussinesq equations to investigate the evolution of surf zone eddies under strong wave-driven currents. The experimental results demonstrate that under strong wave-induced currents, large-scale eddies emerge on both the onshore and offshore sides of the surf zone, exhibiting transient behavior. These eddies detach from the pollutant patches, with the onshore eddies constrained by the shoreline, while the offshore eddies gradually evolve and exhibit a tendency to migrate outward beyond the surf zone. The numerical simulations indicate that strong eddies concentrate near the breaking line, with the surf zone eddy field characterized by upstream and downstream shear zones, both exhibiting similar alongshore spacing and eddy structures. Vorticity positively correlates with wave height and period, and the stronger eddies are shifted to the seaward side. Under irregular wave conditions, vorticity decreases, accompanied by a shoreward shift in the locations of maximum vorticity.
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |