An approach to the solution of the problem of the development and improvement of small-scale monitoring systems for underwater situation through their spatial positioning with the determination of the locations of the seichy areas. The object of research is closed water areas and shallow areas of Peter the Great Bay (Primorsky Region). The subject of the research is the seiches and their influence on the hydroacoustic signal propagating in the water environment, taking into account the new elements of the marine environment monitoring paradigm. During the research, experimental methods are used, expressed in the formation of new elements of the paradigm of monitoring and transformation of approaches that represent the physics of hydrodynamic processes in the marine environment. The paradigm of the classical scheme for monitoring and control the state of the environment, consisting of observation and assessment, is supplemented by methods of forecasting the state of the environment and estimating the predicted state. Within the framework of monitoring, as a statistical process, the frequency of measurements is justified to prevent the missing information about the marine environment, where the intensity of data acquisition is determined by the maximum number of occurrences of the explored (measured) events according to the requirements of the Nyquist-Shannon theorem. The processes and wave phenomena on the surface and in the depth of the marine environment of enclosed water areas and shallow areas are theoretically and experimentally justified, due to the quasi-horizontal horizontally-vertical displacement of water masses, reminiscent of attractors. Seyshes in shallow areas, semi-enclosed bays of Peter the Great Bay are standing free oscillations of a fluid in a "semi-enclosed" space with the formation of a single-node structure in it. According to the degree of influence on the hydroacoustic signal, seiche is a multi-vector spatial zone in deterministic dynamic chaos with a minimum integral level of natural sea noise or a zone of the most favorable arrangement of acoustic (combined) monitoring systems for the acoustic field of the marine environment.

An algorithm for estimating the position of the laser beam by the component scattered in the atmosphere by a matrix photodetector against a background of Gaussian noise is developed. The algorithm is based on the Lehman-Scheffe theorem, which allows one to obtain effective estimates of the distribution parameters using complete sufficient statistics for reports of the observed implementation of scattered laser radiation. The obtained estimates provide the best quality of parameter estimation for any finite sample sizes and do not require additional studies

The article presents the results of the analysis of the properties of disordered structures in hydrodynamic acoustics, associated with the process of detecting physical phenomena and marine objects based on the results of their mechanical impact on the marine environment, in which acoustic vibrations propagate. If vortices, attractors, fractals arise as a result of complex interactions of forces of nature (upwellings, seiches, Coriolis forces, currents, convection flows, rotation of the Earth) and are essentially mechanical effects on the environment of formation and propagation of an acoustic field, then mechanical sources of sound introduced into the hydrosphere (water) should repeat fractal iterations on a smaller scale at the sound field level. Recognizing the equations of hydrodynamics (the equation of motion, the equation of continuity, and the equation of state) as the fundamental equations of hydroacoustics, the nonlinearity of these equations is proposed to be considered the theory of the hydroacoustic field as nonlinear, and the linearity of the processes in this study is considered a special case. The principle of superposition also becomes a special case, and the Fourier transform, remaining necessary, loses its sufficiency. Fractal analysis in combination with wavelet analysis should be involved to help him