Sea water intrusion testing is the process by which seawater moves in a fresh water aquifer due to a significant reduction in hydraulic loading. It takes place in open, underground basins. This paper addresses the analysis stage in the supply of groundwater to check seawater intrusion during the occurrence of dry years and half dry, simultaneously with the holdings of the aquifer. Calculate the length of the seawater intrusion wedge depending on the thickness of freshwater and effective recharge.

To calculate the vulnerability to seawater intrusion of coastal aquifers using ArcGIS , we must first mention some part of Article EXPLORATION COASTAL AQUIFERS MANAGEMENT AS A BASIS OF SUSTAINABLE by Maria Emilia Bocanegra. In this article the author states that "seawater intrusion is a phenomenon of lateral migration of building inspection and the methods commonly used to assess the vulnerability of aquifers only take into account the vertical migration of contaminants (GOD and DRASTIC), so it offers 2 new indicators The SEA-and SEA-GIndex Dindex, which are aimed at evaluating lateral saline intrusion and not take into account the vertical movement of contaminants from the soil surface, therefore, do not include the variables of soil and unsaturated zone. The following figure can observe this phenomenon.

building inspection
Method for obtaining GIndex SEA-GOD adapted the method including two new parameters, which play an important role in the position of the interface fresh water - sea water:

The distance to the coast (rather than the vertical distance to groundwater), the farthest part of the aquifer of the coast is less vulnerable to contamination by salt intrusion.

The pressure head (instead of hydraulic containment level). This is important because it becomes a natural barrier against the advance of seawater intrusion.

The last factor is preserved and that GOD is the method of Lithology, depending on it, salt water or brackish water will have greater or lesser resistance to pollute the freshwater aquifer.