RU2734341C1 - Installation method of marine ground of bottom stations - Google Patents

Abstract

FIELD: vessels and other watercrafts.

SUBSTANCE: method is proposed for installation of marine ground of bottom stations, which consists in carrying out overboard of bottom stations, with ballast release switches, hydroacoustic equipment, magnetic field sensors. In the method, simultaneously with ship stern and from different sides three bottom stations are lowered, equipped with flat rudders with azimuth angle and vertical inclination change drives, connected with hydroacoustic system providing fixed distance between stations in magnetic field of ground, wherein spatial arrangement in water is provided due to hydrodynamic forces occurring during bottom stations diving.

EFFECT: method of installation of marine ground of bottom stations is disclosed.

1 cl, 2 dwg

Description

The present claimed invention relates to geophysical survey methods. There are known marine geophysical research methods, in which a network of hydrophysical stations connected by cables is located on the seabed (1). Oceanological studies are known in which seabed stations are installed on the seabed from a ship (2). The known methods do not provide the required accuracy (geometry) of the location of the installation points on the bottom.

One of the purposes of the hydrophysical test site is to determine the sources of seismic (acoustic) vibrations, their location, power, etc. For the most accurate determination of all parameters, it is necessary to know the locations of the installation points of the sensors (stations containing them) at the bottom, therefore, the more accurate the information about the location of the polygon, the more accurate the information will be. Considering that the depth at which the stations must be placed can reach several kilometers, it is practically impossible to determine the location of each station with an accuracy of several tens of meters.

The purpose of the alleged invention is to improve the accuracy of measurements by ensuring the exact geometry of the landfill on the ocean floor. This goal is achieved by the fact that, simultaneously, from the stern of the ship and from different sides, three bottom stations are lowered, equipped with flat rudders with drives of rotation and tilt angle associated with a hydroacoustic system for ensuring an equal distance between the stations in the earth's magnetic field, while the spatial location in the water is ensured by the hydrodynamic forces arising during the submersion of the bottom stations.

Possibility of practical implementation.

In the drawing, FIG. 1 shows one station in projections. The station is conventionally designated as a circle-1. At the top of the station there is a flat rudder-2, which has a drive in azimuth - arrows A, and vertically - arrows B. In Fig. 1 does not show ballast, breaker, hydroacoustic communication equipment and other devices on them.

So, at the same time, three bottom stations are given from the stern of the vessel and from both sides. Having negative buoyancy, they begin to sink. As soon as the stations find themselves in the water, the system for orienting the rudders in the magnetic field begins to operate, and the hydroacoustic system for controlling the distance between them, which, through a computing device, turns the rudders-2 to the position shown in Fig. 2. In this case, one of the stations, let's call it the main one, orients its rudder in the north-south direction. In the memory of the computing device of the stations, the distance at which the stations should be at the bottom is set. Of course, this distance can be set from the escort vessel along the hydracoustic channels.

When the stations are submerged, the control loops for the vertical angles of the rudders come into play. They, through hydrodynamic interaction with water, in combination with hydroacoustic systems for determining the distance between the stations, ensure the convergence or divergence of the station from each other during the dive. Thanks to hydroacoustic communication and rudder control, the stations retain their geometry in space until they touch the bottom of the water basin, regardless of any currents present in the staging area. To determine the location of the landfill at the bottom, it is enough to know the location of the main station.

If there are significant bottom currents in the area of the landfill installation, a mechanism for dropping the hydrodynamic rudders should be provided so that they do not interfere with the information recording during operation.

Sources of information used in the preparation of the application:

1. Patent of Russia No. 2545092.

2. "Means and methods of oceanological research" Moscow, "Science" 2005, authors G.V. Smirnov and others, p. 61-70.

Claims (1)

A method of installing a sea range of seabed stations, which consists in carrying out seabed stations overboard, with ballast breakers, hydroacoustic equipment, magnetic field sensors, characterized in that, in order to ensure the exact geometry of the location of the stations on the bottom, simultaneously from the stern of the vessel and from different sides three bottom stations, equipped with flat rudders with drives for changing the azimuthal angle and vertical inclination, associated with a hydroacoustic system for ensuring a fixed distance between the stations in the earth's magnetic field, while the spatial location in the water is ensured by hydrodynamic forces arising during the submersion of the bottom stations.

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