FIELD: hydrodynamic modeling.;SUBSTANCE: invention relates to the field of hydrodynamic modeling and can be used for hydrodynamic modeling of a tsunami source. Essence of the invention: a hydrodynamic model of a tsunami source is constructed using a direct computational experiment based on macroseismic approximations of the parameters of an underwater earthquake. Herewith, the hydrodynamic response to short-term and intense seismic shocks of the seabed is realized, resulting in landslide developments and dispersion effects of transformation of long waves in water areas with high-Q oscillators of natural sea level oscillations. For this purpose, the principal axes of elliptical deformation of the sea surface are oriented along the directions of the prevailing isobaths and the coastal encroachment line. Depending on the steepness of the seabed slope in the seaward seismic zone of the seismic source, a tsunami wave front with sea level rise is arranged according to macroseismic estimates, transforming into a negative half-phase of the wave with a lowering of the level closer to the coast to 25–30 % of the value of the front in deep water. On a sloping bottom of the positive and negative half-phases, tsunami waves are imparted with an initial impulse of movement in the direction of smaller depths, for which the source is initiated by a vector field up to 30–40 % of the total flow of the progressive wave. On a flat bottom, the level rise is stationary, the initial speed of the front is not determined.;EFFECT: technical result: precise definition of the initial geometric shape and hydrodynamic parameters of the tsunami source.;1 cl, 6 dwg
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