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Динамические эффекты в придонном слое, индуцированные аномальными внутренними волнами

Тюгин Д. Ю., Наумов А. А., Куркина О. Е., Куркин А. А., Пелиновский Е. Н.

Simulation of abnormally large internal waves generated by the baroclinic tide is now quite important due to the increased number of offshore platforms installed on offshore oil and gas fields. The height of the internal waves in many areas of the oceans can be up to 100 m, and these waves become really dangerous. All of this points to the need to study the possible dynamic and catastrophic phenomena accompanying the propagation of internal waves of large amplitude. In terms of the computational analysis of transient wave motion is a very complex task. There was designed widely used numerical code MIT, decisive full hydrodynamic equations with the real bottom topography, the Earth's rotation and turbulent processes. However, this model requires a lot of computing resources, a number of viable solutions to the practical problems of Oceanology. However, even such a complete model is not yet take into account the current practice relatively stable background horizontal - nonuniform stratification, which is typical for the real ocean conditions. That is why the research and analysis of new phenomena is widely used asymptotic model based on the Korteweg–de Vries equation and its generalizations. In this paper we use the asymptotic model for the analysis of the two most important effects in the bottom layer, induced by internal waves: the change in pressure at the bottom and sediment transport. Moving the sediment and erosion of the bottom near the supports are well known to storm surges in the coastal zone. The specifics of the internal waves is their greater length (a few kilometers), so that such waves are always "get" to the bottom, even far from the coast and can lead to erosion of supports oil platforms in deep water. Particularly dangerous abnormally large waves, since the characteristics of erosion is proportional to the cube of the amplitude of the internal wave. In our country, yet the effects of internal waves on the stability of marine structures are not regulated. What is needed is an active study of this problem in theoretical terms, and the accumulation of data on the hazards of internal waves in areas where there are oil and gas platforms.