Investigation of the Process of the Seishi Influence on the Acoustic Field of Closed Shallow Water Areas

Abstract

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.

Characteristics of the Hydrodynamic Portraits of Acoustic Fields of the Shallow Areas of Peter the Great Bay of Sea of Japan

“…В пределах натурных исследований, проведенных в военно-научной школе № 37 «Низкочастотная активно-пассивная и параметрическая (просветная) гидролокация морской среды» в 2014-2017 гг. были получены многочисленные результаты, выходящие за рамки рассматриваемых в статье вопросов 1 Выполненный анализ натурных измерений полей шельфовой зоны в районе низкочастотных гидроакустических трасс как географического контура показал, что она может условно делиться на три конфигурации (рис. 3):…”

“…При интеграции выводов, представленных в работе [1], с направлениями формирования гидродинамической акустики, предметом дальнейших научных исследований является объяснение степени влияния динамики изменения отдельных гидрометеорологических характеристик на весь процесс ее развития. Объектом изучения являются проведенные авторами статьи экспериментальные, модельные исследования, измерения, а также структура и параметры акустического поля мелководных районов залива Петра Великого.…”