On the basis of the use of hydrodynamic equations to incompressible liquid, reduced to non-dimensional form within the framework of similarity law, probabilistic structure of the field is constructed and researched as the basis of the decision of the problem of the non-dimensional parameter estimation of the flow, created by moving outside source, as well as for estimation of the source proper parameters and parameters of the statistical field propagation channel. The analytical form of the likelihood ratio is found and algorithms of the unknown information parameter estimation as the object of the statistical inverse problem solving are formed.

The results of velocity and temperature nature investigations in the Black sea upper layer during August 2005 are presented. The information about dynamics and structure of these fields was obtained. The existence of internal waves and localized regions of equal temperature and velocity is shown. The energetic and geometric structure characteristics of different nature in a season thermocline region were estimated.

The paper presents the results of current velocity measurements which were carried out below the thermocline in the eastern part of the Gulf of Finland in the second half of July 2010. It was found that the structure of water circulation in the region is generally cyclonic in nature. Comparison of calculated geostrophic velocities with instrumental measurements showed a qualitative agreement only for the direction of currents. The measured modules of current velocity exceeded its values calculated by the dynamic method by two to eight times.

Coast dynamics resulting from the interplay of long vessel wakes and short background wind waves is studied experimentally in tideless conditions of Gulf of Finland. An attempt of qualitative study of impact of each wave system on a coast is made. Special attention is paid to two parameters: the change of sullage volume and the change of the coast profile shape, which is defined as an exponent in the power approximation of the coast. The analysis of these parameters and their variability for ship and wind waves demonstrate peculiarities of the ship wave and wind wave effect on the coast.

In this paper software package for numerical modeling of transformation and propagation of internal gravity waves (IGW) in the World Ocean is presented. Short overview of implemented numerical models is given. They are: extended nonlinear evolutionary equation of Korteveg-de-Vries type with combined nonlinearity with variable coefficients (Gardner equation) and ray model reproducing the effect of refraction in an IGW package. The developed software package is unique and topical for this class of geophysical applications. Description of user interface and main working modes of the software are presented.

We describe a method for approximate reconstruction of main hydrophysic fields using deep-water thermohaline measurements. Methods for solving both non-stationary and stationary, known as «diagnostic» problems, are presented. Proposed approaches are based on full non-linear system of equations of geophysical thermohydrodynamics. A series of results of computations performed from the mid 80-s and up to nowadays are reported.

Nowadays, with account of depletion of hydrocarbon raw materials onshore there is a tendency to develop deep oil and gas fields. In course of development of the fields, significant amount of various lowering-andhoisting operations are fulfilled. The task of determination of the forces in load lifting from deep depth in the conditions of random sea state is solved on the basis of statistic testing method (Monte Carlo method). Mathematical model took into account non-linearities caused by jerking and non-linearities of forces of the load hydrodynamic resistance. Comparison of the results with relevant solutions of linear tasks has been made.