Abstract
Variations in the response to an incident long wave on a step function plateau are considered as a function of the angle of incidence. Only for large angles of incidence is there a substantial change in the modulus of the amplitude ratio of the transmitted to incidence wave. The amplitude of the wave on top of the plateau varies strongly with the angle of incidence. Zero transmission can occur only if there is a net increase in depth across the plateau in the direction of the incident wave the critical angle of incidence being independent of frequency. If the modulus of the angle of incidence is greater than the critical angle, wave energy is trapped along the trailing escarpment of the plateau.
Published Version
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