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- W2925014055 abstract "We study the horizontal dispersion of passive tracer particles on the free surface of gravity waves in deep water. For random linear waves with the JONSWAP spectrum, the Lagrangian particle trajectories are computed using an exact nonlinear model known as the John–Sclavounos equation. We show that the single-particle dispersion exhibits an unusual super-diffusive behavior. In particular, for large times t, the variance of the tracer ⟨ | X ( t ) | 2 ⟩ increases as a quadratic function of time, i.e., ⟨ | X ( t ) | 2 ⟩ ∼ t 2 . This dispersion is markedly faster than Taylor’s single-particle dispersion theory which predicts that the variance of passive tracers grows linearly with time for large t. Our results imply that the wave motion significantly enhances the dispersion of fluid particles. We show that this super-diffusive behavior is a result of the long-term correlation of the Lagrangian velocities of fluid parcels on the free surface." @default.
- W2925014055 created "2019-04-01" @default.
- W2925014055 creator A5000952198 @default.
- W2925014055 creator A5037328807 @default.
- W2925014055 date "2019-03-19" @default.
- W2925014055 modified "2023-09-30" @default.
- W2925014055 title "Surface Waves Enhance Particle Dispersion" @default.
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- W2925014055 doi "https://doi.org/10.3390/fluids4010055" @default.
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