my question relates to a transient groundwater flow model calibration with PEST.
The monsoon period in my study area starts in July and peaks in October. Afterwards, the monsoon stops and the recession period begins until the monsoon appears again in July such that regional groundwater dynamic continously changes. Therefore, I would need a transient calibration.
For the transient calibration, I started first with a steady state calibration (storage = 0) in order to get a calibrated hydraulic conductivity set. This set is used for further transient calibration.
Now, I’m not sure how to integrate the changing recharge into the transient calibration process (1 year) with PEST.
(i) Is there any possibility to set the recharge (e.g. 50 mm/month) between July until October and then with recharge to 0 mm/month between November to July? Recently, I give a constant recharge in the *.prj file.
(If yes, is there any example where I could have a look how it could look like?)
(ii) How does PEST recognize this change in recharge and compare it to the „right“ head observations? PEST probably needs more observations during monsoon and during the recession curve right?
So far, I applied the previous calibrated hydraulic conductivity values.
For the transient calibration I want to calibrate the „storage“.
Here I give initial values of e.g. 1E-4 in the *.prj file to make the model transient again. In the *.pst file I changed the values into e.g. !st0!.
I did not do a transient calibration yet, therefore, it would be nice if I could get some advice from you