Abstract
Horizontal dispersion by tidal and residual currents is discussed in terms of two different mechanisms, viz. a “cascade” of shear-dispersion processes and “Lagrangian chaos”. In the first one, turbulence interacts with vertical shear, producing horizontal dispersion. In turn, that mechanism interacts with horizontal shear of residual currents, giving rise to a large effective dispersion in the residual current direction. In “Lagrangian chaos”, genuine turbulence is absent and the Eulerian velocity is supposed to be a simple periodic function of time and, whether or not, of the horizontal position. Particle-trajectories may then become random functions of time, either by spatial randomness of the Eulerian field, or by the appearance of deterministic chaos in the Euler-Lagrange transformation.
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