期刊
JOURNAL OF FLUID MECHANICS
卷 638, 期 -, 页码 1-4出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0022112009991984
关键词
Waves; drift; diffusion; nonlinearity
A finite-amplitude propagating wave induces a drift in fluids. Understanding how drifts produced by many waves disperse pollutants has broad implications for geophysics and engineering. Previously, the effective diffusivity was calculated for a random set of small-amplitude surface and internal waves. Now, this is extended by Buhler & Holmes-Cerfon (J. Fluid Mech., 2009, this issue, vol. 638, pp. 5-26) to waves in a rotating shallow-water system in which the Coriolis force is accounted for, a necessary step towards oceanographic applications. It is shown that interactions of finite-amplitude waves affect particle velocity in subtle ways. An expression describing the particle diffusivity as a function of scale is derived, showing that the diffusivity can be substantially reduced by rotation.
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