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Can CXTFIT simulate advective transport against dispersion?

Posted: Fri Sep 05, 2014 6:47 am
by norm
I need to calculate 1-D contaminant concentration profile along advective groundwater flow against dispersion. In other words, groundwater flow containing low concentrations is towards a region of high concentrations. My goal is to find the advective velocity that provides the best-fit to observed concentrations.

The most relevant literature on such an analytic solution is:
A. N. S. Al-Niami and K. R. Rushton, Analysis of flow against dispersion in porous media, J. Hydrology, 33(1977), 87-97.

My understanding is that the analytical solutions in CXTFIT are for matching column test data, where fluid containing high concentrations is injected upstream; therefore, flow is always along the same direction of dispersion. If that is the case, I won't be able to use CXTFIT for my study. Is my understanding correct?