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The term Rayleigh–Lamb waves embraces the Rayleigh wave, a type of wave that propagates along a single surface. Both Rayleigh and Lamb waves are constrained by the elastic properties of the surface(s) that guide them. Figure 1: Upper and lower, respectively: Extensional (S 0) mode with / =.
Internal tides are generated as the surface tides move stratified water up and down sloping topography, which produces a wave in the ocean interior. So internal tides are internal waves at a tidal frequency. The other major source of internal waves is the wind which produces internal waves near the inertial frequency.
Like light waves, inertial waves are transverse, which means that their vibrations occur perpendicular to the direction of wave travel. One peculiar geometrical characteristic of inertial waves is that their phase velocity , which describes the movement of the crests and troughs of the wave, is perpendicular to their group velocity , which is a ...
Rayleigh waves are distinct from other types of surface or guided acoustic waves such as Love waves or Lamb waves, both being types of guided waves supported by a layer, or longitudinal and shear waves, that travel in the bulk. Rayleigh waves have a speed slightly less than shear waves by a factor dependent on the elastic constants of the ...
As the surfer passes the flying ray, the end of its long tail gets dangerously close. Then it lands back in the water, and the surfer and the ray both go on to enjoy the ocean.
The structure and dispersion relation of internal waves in a uniformly stratified fluid is found through the solution of the linearized conservation of mass, momentum, and internal energy equations assuming the fluid is incompressible and the background density varies by a small amount (the Boussinesq approximation). Assuming the waves are two ...
Like many others who found themselves working remotely, Linette Miller, 59, noticed that she had become sedentary. “It suddenly dawned on me how little activity I get every day,” Miller, from ...
High delta wave activity. Some research has linked sleep inertia with increased delta waves, electrical waves in the brain usually seen during NREM (non-rapid eye movement) sleep. Sleep inertia ...