Vortical flows in shallow water interact with long surface waves by virtue of the nonlinear terms of the fluid equations. Analytical formulas are derived that quantify the spontaneous generation of such waves by unsteady vorticity as well as the scattering of surface waves by vorticity. In the first Born approximation the radiated surface elevation is linearly related to the Fourier transform of the vorticity. The ``dislocated'' wave fronts that are analogous to the Aharonov-Bohm effect are obtained as a special case.
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Cerda et al. (1993) studied this question.
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