Recently much attention has been given to anomalous transport and coupled geochemical processes involving solute mixing and biogeochemical reactions that cannot be accurately described by the classical advection-dispersion theory. For example, the traditional advection-dispersion equations cannot predict the non-Gaussian solute distributions observed in both homogenous and heterogeneous media and tend to over-predict the amount of the product of mixing induced reactions. Incomplete mixing between preferential flow channels may also lead to the inaccurate prediction of the arrival time. Numerous laboratory experiments and numerical pore-scale investigations have shown the importance of the non-uniform sub-Darcy scale mixing on larger scale reactive transport processes.
A variety of methods ranging from hybrid pore-scale/Darcy scale models to stochastic discrete lagrangian particle models are being developed to address the anomalous and highly coupled transport problems. We solicit contributions describing new theories, numerical methods and laboratory studies that advance the understanding of complex transport phenomena on the scales ranging from pore to field scales. Contributions describing pore-scale models, upscaling, effects of flow channeling, reactive random walk and continuous time random walk models, stochastic Eulerian and Lagrangian methods, fractional transport equations, laboratory and field scale experiments are welcome.