Hello! Although I am unsure of what specific details you are currently seeking, perhaps one of the following articles (or references therein) may be of some interest or assistance to you:
Dynamic of Seawater Interface Using Hydrochemical Facies Evolution Diagram (GIMÉNEZ-FORCADA, 2010)
http://info.ngwa.org/gwol/pdf/100384184.pdf
Strontium, SO42-/Cl- and Mg2+/Ca2+ Ratios as Tracers for the Evolution of Seawater into Coastal Aquifers: The Example of Castell de Ferro Aquifer, Spain (SE Spain) [PULIDO-LEBŒUF et al., 2003]
http://hera.ugr.es/doi/15059789.pdf
Major Ion Characterization of Coastal Saline Groundwaters (HOWARD and LLOYD, 1983)