Hello Hydrus Forums,
I’m trying to measure the effects of gypsum on EC in the UNSATCHEM model (particularly a subsect of that model, named “ExtractChem”).
The inputs I have to run the model are as follows:
imgur link as backup: https://imgur.com/9GctqdB
However, including Gypsum in the model from observed values results in inaccurate inflation of model predicted EC at lower salinity concentrations (see 1:1 graphs below):
imgur link as backup: https://imgur.com/kcWUWgy
This is reflected by Ca concentrations in solution:
imgur link as backup: https://imgur.com/SAdz3ll
My question is this: why might excluding gypsum from the UNSATCHEM model resulting in a more accurate representation of solution EC/Ion concentrations even though my gypsum values are from observed data?
I also have pore water solution data from soil suction lysimeters that correspond with each one of these saturated paste samples, with similar trends occurring in EC and Ca precipitation/dissolution if that is helpful for deduction purposes.<br/>
Thanks for the help,
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