Solute transport in bounded porous media characterized by generalized sub-Gaussian log-conductivity distributions

•Log-conductivity (Y) is modeled as a generalized sub-Gaussian (GSG) field.•Average longitudinal spreading is smaller for GSG than for Gaussian Y fields.•Plume stretching in GSG fields is enhanced with respect to Gaussian fields.•Local dispersion masks identification of impacts of non-Gaussianity on transport.•The GSG nature of Y can be difficult to identify relying only on transport metrics.