Numerical simulation for diffusion process by the Kelvin-Helmholtz instability

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The Kelvin-Helmholtz instability is numerically simulated to investigate the diffusion process of fine sediment maintaining on the sea surface. A realistic sediment distribution at the Rhone River estuaries is shown and the numerical simulation is carried out under the realistic wind condition. The following features are found out: (1)the initial strong impact caused by the gust wind on the sea surface can induce the Kelvin-Helmholtz instability, and induce the vertical mixing. (2)the mean wind speed, temperature differences and salinity differences do not play significant roles for inducing the Kelvin-Helmholtz instability.

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