Laboratory of Nonlinear Hydrophysics and Natural Disasters

Scientific results:

1. Empirical distribution functions of hydrophysical fields and frequency of repetition of internal waves of large amplitude are constructed.
2. Experimental data on registration of geospheric processes in the infrasound range of the laser interference complex at the UKPMI POI FEB RAS "International Scientific and Educational Geospheric Polygon" were obtained.
3. The conditions for the implementation of critical layers in stratified flows and their geographical and seasonal variability in relation to the conditions of the Sea of Japan are highlighted.
4. The analysis of the destruction of the tidal inner boron at the edge of the shelf, the features of the modes of generation of soliton-like waves and their propagation across the shelf with a variable bottom profile is carried out within the framework of the Korteweg-de Vries models and the Gardner equation. The results of the verification of the technique based on in-situ data obtained by contact methods and using laser deformographs
5. The characteristics of the quasi-solitons of the envelope isolated in the fields of irregular waves based on the results of direct numerical modeling of the Euler equations are highlighted. Their manifestations in the fields of microseisms.
6. Statistics of the formation of killer waves are obtained based on model calculations using the stochastic nonlinear Schrodinger equation. The relationship of the spatial spectrum of surface waves with the correlation properties of fluctuations.
7. A software module has been calculated for solving a stochastic partial differential equation describing the elevation of the sea surface induced by a random velocity field.
8. The correspondence between the spectral parameters of the surface wave and the microseismic noise pattern is performed according to the data of direct numerical modeling of three-dimensional Euler equations. The dependence of microseisms on the spectrum width and intensity of single-mode waves.
9. New results of field measurements of microdeformations of the Earth's crust, variations in atmospheric pressure, variations in hydrosphere pressure, meteorological parameters during the passage of typhoons in recent years have been obtained. A software module for investigating the relationship of the obtained data with meteorological data based on the Granger causality criterion.
10. A test set of sea surface elevation realizations has been performed for various types of correlation tensor of a random velocity field.
11. A model describing the scattering of surface waves by random inhomogeneities is constructed. Statistical estimation of the probability of occurrence of killer waves due to stochastic focusing in the vicinity of caustics.

Education and personnel occupational retraining:

1. Lecture cycles "Nonlinear hydrophysics" and "Theory of solitons" were read at FEFU and posted on the Internet.
2. Lectures and practical classes were given at the school of a young oceanologist, as well as within the framework of the scientific school "Floating University".
3. Lectures were given, practical and laboratory classes were conducted within the framework of the master's program "Digital Technologies and means of monitoring and development of the World Ocean" on the basis of the FEFU Institute of the World Ocean, as well as in graduate school TOI FEB RAS

Cooperation:

Federal Research Center A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS)