> I want to simulate the movement of an acidic water through a calcite-bearing soil and graphically illustrate the "banding" that one would see as Fe and Al hydroxides, and thereafter Mn oxides, precipitate. But I am not sure how to setup the advection block to output the correct data to the selected output file. I should be able to do this with one cell, and move progressived pore volumes through. Somehow I need to graphically display the amount of mineral versus a "distance" rather than a pore volume ( i think). I'm not sure how you want to convert time to distance, but USER_PUNCH will allow you to make any calculation you want. The variable TOTAL_TIME contains the simulation time and can be used in Basic statements in USER_PUNCH. > One thing I have done is produced a titration curve where I reacted calcite with the water in increments, and indeed it shows Fe and Al precipitating before Mn. But, it would be nice to have a "depth versus mineral concentration" plot that shows the banding I have observed in the field. Can you provide any suggestions? Seems like you should set up a multi-cell column and plot the amounts of the mineral with distance. You can use -equilibrium_phases to put the data into the selected output file, or use the MIN function in Basic statement in USER_PUNCH. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled
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