I would set up the model with at least two layers, as unconfined aquifer. Then,
in the top layer, assign two conductivity areas: one with high, for the
unconfined part, and one with very small, for the confined part.

Cris.


----- Original Message ----
From: fabrice.compere <fabrice.compere@...>
To: visual-modflow@...
Sent: Wednesday, August 6, 2008 5:05:23 AM
Subject: [visual-modflow] Help required to modelize an unconfined then becoming
confined aquifer


Hi to the members of this group.
That's my first post ever here !

I'm performing a preliminary research concerning the possibility to
modelize a chalk aquifer unconfined in its west part, then becoming
confined in its East part.

At this day, I have not found any serious reference describing such a
problem. Obviously, I would tend to a simplistic (?) approach
involving strong contrast in storage coefficient between the two
areas.

How to treat this type of configuration with ModFLow ?
Does anybody knows a reference (article, book,...) dealing with this
problem ?

Thanks a lot to answer.

Best regards

Fabrice