Existence of preferential flow through unknown paths is a serious problem for any model to be realistic in karstic aquifers.
This is an acute problem in Jaffna peninsula of Sri Lanka, We can try to put a impervious curtain along the sensitive sea discharge locations.
I believe there are some new versions of the USGS code SEAWAT which should be able to help model the situation proposed. SEAWAT is in the public domain in the US.
Thanks a lot Christopher. I will look for it.
MODFLOW-DCM (discrete conduit model)
http://books.google.com.pe/books/about/Enhanced_Characterization_and_Representa.html?id=RvVtMUj2cIQC
Thanks Cynthia.
MODFLOW-CFP
Thanks Husam. Will try
USGS SEAWAT, MODFLOW with seawater intrusion package, Also you can used Strack(1976) base models. In my opinion SEAWAT is the best
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