MARINE EXTREME SURFACE DISTURBANCESMI
Along with the tsunami, killer waves are among the catastrophic phenomena of the World Ocean, which bring enormous losses to both people and marine objects created by human hands. We call them more moderate-marine extreme surface disturbances. This name is due to the fact that the name of the killer wave, in our opinion, corresponds more to a tsunami. In the classical representation of wave excitation, they poorly fit the name of a wave. Nevertheless, their generally accepted name is killer waves. The article discusses the results of processing sections of recordings of a laser hydrosphere pressure variations meter installed on the shelf of the Sea of Japan at a depth of 27 m, in which marine disturbances are distinguished, similar in appearance to killer waves: "one sister", "two sisters", "three sisters". When processing the experimental data obtained for June 2007, the main modes of wind waves and infragravity sea waves responsible for the formation of the observed killer waves were identified. Extreme surface disturbances against the background of wind waves are strongly distinguished in amplitude and shape. The intermode energy transfer in the observed wave packet resembles in its behavior a modified Fermi-Paste-Ulam return, characteristic of oscillators-geoblocks of the Earth's crust. Energy transfer occurs between modes of different wave packets having different nature of formation. Thus, in the experimental data under consideration, the first wave packet corresponds to the wind range, and the second to the infragravity range.
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