TRANSPORT SCALING AND TRAPPING

It is shown that particle trapping plays an important role in the appe arance of anomalous or strange diffusion in turbulent fields, mainly b y inducing a non-Gaussian statistics of the stochastic displacements. Trapping processes are responsible for the important deviation observe d between the traditional prediction of Bohm scaling for diffusion in low-frequency turbulence and the numerically checked prediction by Isi chenko. Also, several theoretical models are proposed or reviewed.