> My selective output file lists steps as specified by "punch_cells" and "punch_frequency" commands preceded by 15 lines (all numbered "step ?99"). I can trace last 7 lines (out 15 in question) to some parameters of my seven layers. The fist 8 lines are conundrum for me. The PHREEQC manual for SELECTED_OUTPUT refer to lines "?99" as other calculations. Would you please enlighten me what are these calculations whose results are presented in lines marked -99? Starting with the simulation in which SELECTED_OUTPUT is defined, every calculation adds a line to the selected-output file. A calculation includes initial solution calculations and reaction calculations. I think the -99 for step are probably initial solution calculations. If you move the SELECTED_OUTPUT definition to the simulation where ADVECTION is defined, you will not get the initial lines in the selected-output file. The results for uranium sorbed within each layer after one and two pore volumes are identical. It seems to me that the logistics of ADVECTION key word does not account for the reduced site concentration that exist after the first pore volume moved through. Am I interpreting it correctly, and if so, is there any way to account for the reduction in site concentration for the advancement of the second pore volume? I can't tell what your problem is. The sites (SURFACE or EXCHANGE) are immobile and remain in the cell for which they were defined. However, sorbants will accumulate on the sites from pore volume to pore volume. Remember that a time step only advects the solution one cell; a pore volume would require 46 steps if you have 46 cells. 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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