Re: Phreeqc

["David L Parkhurst" <dlpark@xxxxxxxx>]

Hi,

You can define a MIX for each cell and simulate transport with ADVECTION.
The program will perform the mixing with each advective step.

TRANSPORT defines MIX internally for each cell, so you can not define your
own without a trick. You can set up a stagnant layer and then define your
own mixes for the mobile layer.  The following example mixes NaCl into an
otherwise pure water column. The stagnant layer compositions (12-21) remain
unchanged. After 10 time steps, the result should be approaching a steady
state.

David

David Parkhurst (dlpark@xxxxxxxx)
U.S. Geological Survey
Box 25046, MS 413
Denver Federal Center
Denver, CO 80225

SOLUTION 0
SOLUTION 12-21
    temp      25
    pH        7
    pe        4
    redox     pe
    units     mmol/kgw
    density   1
 Na 1
Cl 1
    -water    1 # kg
SOLUTION 1-10
    temp      25
    pH        7
    pe        4
    redox     pe
    units     mmol/kgw
    density   1
    -water    1 # kg
MIX 1
   1  .9
   12 .1
MIX 2
   2  .9
   13 .1
MIX 3
   3  .9
   14 .1
MIX 4
   4  .9
   15 .1
MIX 5
   5  .9
   16 .1
MIX 6
   6  .9
   17 .1
MIX 7
   7  .9
   18 .1
MIX 8
   8  .9
   19 .1
MIX 9
   9  .9
   20 .1
MIX 10
   10  .9
   21 .1
TRANSPORT
    -cells                 10
    -shifts                10
    -flow_direction        forward
    -boundary_conditions   flux flux
    -dispersivities        0.1 9*0
    -warnings              true
      -stag 1



                                                                                                                     
                      "Prof. Merkel"                                                                                 
                      <merkel@xxxxxxxx         To:      "David L Parkhurst" <dlpark@xxxxxxxx>                        
                      reiberg.de>              cc:                                                                   
In-Reply-To: <3.0.6.32.20011021141229.0154f870@xxxxxxxxxxxxxxxxxxxxxxxx>
                                               Subject: Phreeqc                                                      
                      10/21/01 06:12                                                                                 
                      AM                                                                                             
                                                                                                                     
                                                                                                                     



David,

is it possible to add a certain amount of a solution to each cell within a
transport simulation with PHREEQC e.g. via the MIX statement? The aim of
this is to simulate dilution within a contaminaton plume.

Regards

Broder

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