Grid construction on simple yet particularly discontinuous layers

[Amin Hammami]

Hello good people,

I'm a beginner in modflow and hydrodynamic modeling so pardon the question that might seem obvious to some.

I'm working on an area containing 2 major aquifer systems one phreatic and another deep aquifer system of multiple aquifers (for the sake of simplicity for my first try i gathered them in one layer hoping i can either edit said layer through refinement later on). 

My problem here is that due to the discontinuity of the aquifer, I have been constrained by the "no lateral discontinuity of layers" rule of modflow. I have been unable to create a deformed grid that would adopt the layer thickness". A semi-uniform grid works but it's not that good in my case because the two layers of my model have a huge difference in thickness and it would require a large number of layers just to get the thickness right.
I tried the unstructured grid route but the resulting refined layers are odd at best with the thickness of some cell exceeding 1km when it should be just around few tens of meters.

I will attach screenshots of each step. Any advice I should consider?

The second question unrelated to the first problem (i might create another thread for it though), due to the underwhelming data I possess concerning the hydrodynamic parameters, I have chosen to only use 2 layers for the model and playing around with the vertical hydraulic conductivity to simulate aquitard. How stupid is this idea?

Thank you all

[Mak.Gurukul]

What is the GUI you are using for Divising the model ?. If you are not using MODEL MUSE only select few could help you in resolving your issue of discretization of your conceptual model