Model reduction of a coupled numerical model using proper orthogonal decomposition.

Highlights: [•] POD is applied to the coupled variable-density flow and solute transport system. [•] Detailed derivation is presented for the developed GFEM-POD reduced-order model. [•] Henry problem and Elder problem are tested to confirm the proposed procedure. [•] Accuracy is mainly influenced by the optimal selection and update of snapshots. [•] Reduced model can substitute full model with much less computational cost. [ABSTRACT FROM AUTHOR]