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Definition of saturation index SI/ documentation of version 3
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Topic: Definition of saturation index SI/ documentation of version 3 (Read 248 times)
d_guse
Contributor
Posts: 3
Definition of saturation index SI/ documentation of version 3
«
on:
May 04, 2021, 07:05:19 PM »
Dear all,
I have a question concerning the definition of the saturation index SI respectively concerning its documentation.
According to the documentation of version 2 of PHREEQC, SI is defined according to the attached screenshot (from:
https://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqc/html/final-11.html
).
1. Shouldn't this equation read SI = log(IAP / K_SP) with K_SP defined according to eq. (35)? In my opinion, K_SP^(-1) (or a_m,eq^(-1)) is missing in eq. (36).
2. Is there any equivalent documentation for version 3 of PHREEQC concerning the numerical methods and equation definitions?
Thank you very much!
Kind regards
David
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dlparkhurst
Top Contributor
Posts: 2435
Re: Definition of saturation index SI/ documentation of version 3
«
Reply #1 on:
May 05, 2021, 01:08:12 AM »
Yikes. You are right. There should be another term: -log(Kp) or a divisor of Kp inside the log IAP term.
No, the documentation of the numerical method of version 2 is essentially the same for version 3 and was not repeated in the version 3 manual. What can I say, I got tired of writing documentation. Description of numerical methods of new features, particularly TRANSPORT, were added to a limited extent within the description of input for the keywords in the Version 3 manual.
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