dispersive transport and boundary conditions

[Maxim Yutkin]

Hi all,

I was wondering what would be the best way to run dispersive transport with the module. According to the manual phreeqc uses mix function to "manually" account for dispersion. How can this be achieved using the module? How to choose boundary conditions?

The reason for such question is that I am running a transport simulation with a process that phreeqc cannot account for. The process readjusts bulk concentrations a bit. The idea was to use the module and run a python code that would readjust the concentrations before they are fed into next iteration. However, I do need to model it with dispersion.

Any help or advice is appreciated.

Thank you!

[Parkhurst, David]

The mixing model that PHREEQC uses for transport is not commonly used. Usually, the partial differential equations for advection and dispersion are solved with more standard numerical methods--implicit or explicit formulas for time and space. 

You can use the mixing model, but you would have to study the manual for version 2 and probably get a copy of the book by Appelo and Postma, Groundwater, geochemistry and pollution. 

PhreeqcRM is designed to run chemistry on a set of cells, but the user is expected to do all of the transport calculations. 

David Parkhurst
Hydrologist
dlp...@usgs.gov
Profile: https://profile.usgs.gov/dlpark
Project: http://wwwbrr.cr.usgs.gov/projects/GWC_coupled

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