Optimal Groundwater Management Using Evalutionary Algorithms to Prevent Saltwater Intrusion

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Management of a coastal aquifer is studied by using two different evolutionary algorithm, genetic algorithm (GA) and simulated annealing (SA). The objective is to prevent salt water intrusion while maximizing the pumpage from coastal aquifers. The well locations are specified as control points behind which the salt water intrusion is not permitted. Hence the contamination of these wells by salt water will be avoided. An optimum control approach that combines simulation with optimization is applied. A well known groundwater flow simulation code MODFLOW is used for the numerical solution of the governing equation where the single potential formulation is adapted. The formulation is based on the sharp interface and Ghyben-Herzberg approximation. SA and GA are applied as the optimization method for the developed nonlinear optimization problem and results are compared. The study has shown that the combined simulation optimization procedure based on GA and SA can be of use for a successful management of coastal groundwater to prevent saltwater intrusion.

Link to material: http://www.ifors.org/developing_countries/downloads/oct31_2011/3.pdf