  Intermittency in the Gledzer-Okhitani-Yamada (GOY) model of turbulence is
explained in terms of collisions of coherent soliton-like structures with a
random background issuing from the desintegration of their predecessors. This
two-fluid picture is substantiated by the elucidation of local dynamical
mechanisms leading to anomalous growth of coherent structures, their detection
in true signals involving forcing and dissipation, and an investigation of
their statistics.
