ABSTRACT
An implicit simulation-optimization model for an optimal design of a subsurface barrier to control seawater intrusion is developed. The optimal design of this barrier will achieve: (1) minimum dimension of the barrier, (2) maximum value of the permeability of the material used for construction of the barrier, and (3) minimum distance of the barrier from the sea boundary. As a result, the cost of construction of a subsurface barrier may be reduced. This model combines a groundwater flow and contaminant transport simulation model with a nonlinear optimization solver. The model is applied to a hypothetical cross section of a coastal aquifer system under unsteady state conditions. Preliminary results indicate that the implicit simulation-optimization model provides a solution that may reduce high construction cost of a subsurface barrier.
