Karen,

A good study on the work that was done at Port Hudson is located at http://etd.lsu.edu/docs/available/etd-05312005-113524/unrestricted/Williamson_thesis.pdf.
As far as I know, this has been the only one that has been conducted in the area.
Port Hudson is nice to visit anytime, but during a reenactment it is especially fun. The staff is a fountain of knowledge.