Welcome,
Guest
. Please
login
or
register
.
Did you miss your
activation email
?
1 Hour
1 Day
1 Week
1 Month
Forever
Login with username, password and session length
Forum Home
Login
Register
PhreeqcUsers Discussion Forum
»
Inverse Modelling
»
Inverse Modelling
»
Inverse Modeling
« previous
next »
Print
Pages: [
1
]
Go Down
Author
Topic: Inverse Modeling (Read 1558 times)
rajeshrajenthran
Contributor
Posts: 1
Inverse Modeling
«
on:
November 19, 2014, 07:33:48 AM »
I am using two groundwater samples along the flow path
Initial solution
pH Na Ca Mg K Cl- SO42- HCO3 Si Al
7.76 58.40 128.79 50.61 8.60 181.82 284.92 434 9.72 0.07
Final Solution
7.31 9007.27 427.29 1018.68 303.50 17898.17 35.55 1781.20 6.47 0.22
but i am getting this kind of errors
Using Cl1 standard precision optimization routine.
WARNING: Mg is included in solution 1, but is not included as a mass-balance constraint.
WARNING: Mg is included in solution 2, but is not included as a mass-balance constraint.
ERROR: Not possible to balance solution 1 with input uncertainties.
ERROR: Not possible to balance solution 2 with input uncertainties.
ERROR: Calculations terminating.
Stopping.
Please give me solution
Logged
ztwatson
Top Contributor
Posts: 27
Re: Inverse Modeling
«
Reply #1 on:
November 25, 2014, 04:23:55 PM »
I am not sure if you have your input set up correctly. You should provide your entire input for verification to see what is wrong. You may need to include minerals for dissolution or precipitation. Also make sure your balances and/or uncertainties are in the input.
Logged
dlparkhurst
Top Contributor
Posts: 1099
Re: Inverse Modeling
«
Reply #2 on:
November 27, 2014, 04:32:27 AM »
You need to include all major elements of solution as mole-balance equations in the inverse modeling setup. You may use -balance; Mg; to include the equation, or probably better is to provide a mineral/exchange source/sink in -phases.
By not including Mg it is ignored in the solution resulting in a charge imbalance in the inverse calculations.
Logged
Print
Pages: [
1
]
Go Up
« previous
next »
PhreeqcUsers Discussion Forum
»
Inverse Modelling
»
Inverse Modelling
»
Inverse Modeling