As far as I have researched, it seems that the adjoint method, which is utilized for calculating sensitivities, is not implemented in MODFLOW 6, whereas it was implemented in MODFLOW 2005.
- Is this correct?
- If so, why isn't the adjoint method implemented in MODFLOW 6?
I think you are correct that mf6 does not have a baked-in adjoint solution. However I'm part of a group that is working on an open-source generic adjoint solver for mf6 and we are planning to release it in a couple of months...