The authors presented an interesting study on a reduced-order model (ROM) for the simulation of wind-induced currents in the Gorgan Bay in Iran. The technique they used is based on data obtained by primitive-equation simulations using the three-dimensional flow equations, which are subsequently reduced by proper orthogonal decomposition. The method is valuable as it helps manage large sets of hydrodynamic simulation data. It is clear that the quality of the reduced data depends on the quality of the original data; in this case, the results of the simulation of the wind-induced currents. Given the semi-empirical nature of calibration and the difficulties in the validation of simulations through the comparison with field measurements, it is worthwhile to interpret the salient features of these simulations in terms of known theories. Herein, we offer a comment on a feature present in the simulations of the wind-induced currents.

The data...

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