Abstract

Based on available field data one can discuss the wave shapes that might be observable in natural systems. In many photographs of the sea surface taken from aircraft or satellites using passive or active sensors the surface signatures of internal waves can be clearly seen. These waves are visible because the particle motions that they create as they propagate produce a straining field at the surface, which modifies the reflective properties of the surface-wave field. It has been established that such internal waves are formed by the interaction of the flow that is created by the barotropic tide with bottom topography. Once these waves have been formed, they propagate and evolve into a sequence of finite amplitude, solitary waves, ordered by amplitude, which then slowly separates in space. Such a property is a general one for the systems that can support solitary waves.

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