Comparison of Moments for Classical‐, Quasi‐, and Convolution‐Fickian Dispersion of a Conservative Tracer

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Transport moments up to fourth order for convolution‐, quasi‐, and classical‐Fickian dispersion of a conservative tracer are presented and compared. Convolution‐Fickian yields a non‐Gaussian distribution while quasi‐ and classical‐Fickian result in Gaussian type distributions regardless of the distribution of a stationary velocity field. The first and second central spatial moments are the same for convolution‐ and quasi‐Fickian dispersion, while the third and fourth central moments differ.