## Abstract

Transport processes in groundwater systems with spatially heterogeneous properties often exhibit anomalous behavior.

Using first-order approximations in velocity fluctuations we show that anomalous superdiffusive behavior may result if velocity fields are modeled as superpositions of random space functions with correlation structures consisting of linear combinations of short-range correlations.

In particular, this corresponds to the superposition of independent random velocity fields with increasing integral scales proposed as model for evolving scale heterogeneity of natural porous media [Gelhar, L. W. Water Resour. Res. 22 (1986), 135S-145S].

Monte Carlo simulations of transport in such multi-scale fields support the theoretical results and demonstrate the approach to superdiffusive behavior as the number of superposed scales increases.

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N. Suciu, S. Attinger, F.A. Radu, C. Vamoş, J. Vanderborght, H. Vereecken, P. Knabner, *Solute transport in aquifers with evolving scale heterogeneity*, Preprint No. 346, 2011, Institute of Applied Mathematics, Friedrich-Alexander University Erlangen-Nuremberg

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