Evolution characteristics of surf zone eddies in a strong alongshore current

Fu Nannan; Ren Chunping

doi:10.12284/hyxb2025017

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Fu Nannan，Ren Chunping. Evolution characteristics of surf zone eddies in a strong alongshore current[J]. Haiyang Xuebao，2025, 47(2)：1–13 doi: 10.12284/hyxb2025017

Citation:

Fu Nannan，Ren Chunping. Evolution characteristics of surf zone eddies in a strong alongshore current[J]. Haiyang Xuebao，2025, 47(2)：1–13 doi: 10.12284/hyxb2025017

Citation:

Fu Nannan，Ren Chunping. Evolution characteristics of surf zone eddies in a strong alongshore current[J]. Haiyang Xuebao，2025, 47(2)：1–13 doi: 10.12284/hyxb2025017

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Evolution characteristics of surf zone eddies in a strong alongshore current

doi: 10.12284/hyxb2025017

Fu Nannan^1
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Ren Chunping^{1
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College of Water Resource Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Received Date: 2024-11-03
Rev Recd Date: 2025-01-06

Available Online: 2025-04-18

Abstract

Abstract

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 large eddy patches form both onshore and offshore within the surf zone under strong wave-induced currents, exhibiting transient behavior. Onshore eddies are constrained by the shoreline, whereas offshore eddies gradually expand and migrate seaward. 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.
- Surf zone,
- strong wave-induced currents,
- eddy evolution,
- Funwave,
- vorticity wavenumber spectra

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References(44)

References

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