CTRW MATLAB TOOLBOX

Continuous Time Random Walk (CTRW) theory captures a broad range of dispersive transport behaviors in fractured and heterogeneous porous materials. A major advantage of the CTRW theory is that the resulting solutions are robust over a wide range of transport regimes and dispersive behaviors, and require a minimum of fitting parameters. It is important to recognize that the advection-dispersion equation (ADE) can be derived as a special, limit case of the CTRW. Details of these conditions, which in simple terms require a very high degree of homogeneity in the hydraulic conductivity, can be found in literature referenced on the website.
The CTRW MATLAB TOOLBOX contains software to model non-Fickian (as well as Fickian) transport. The software enables both "forward" modeling and "inverse" (best-fit) modeling of experimental data. A variety of inlet and outlet boundary conditions, and types of transport, are implemented. Version 4.0 (May 2017) contains a User's Guide and accompanying files with easy-to-use format. Several examples clearly demonstrate how to work with the Toolbox in many typical analyses.