On the propagation of pressure-patterns: Part II

Summary The theory of Part I is extended to take account of vertical motion and frictional drag. Surface friction is found not to affect appreciably the propagation speed of troughs and wedges. It is found, further, that the speed of a disturbance at the surface is not appreciably affected by the pattern of vertical motion. However, if the upper part of the perturbation moves at the same speed as the surface wave, a certain pattern of vertical motion is necessary, depending on the morphology of the perturbation, and of the mean flow.