RU127188U1 - SYSTEM FOR MEASURING THE DEPTH OF THERMOCLINE FROM A DRIFTING VESSEL - Google Patents

Abstract

A system for measuring the depth of a thermocline from a drifting vessel, containing vertically distributed measuring lines of thermo-integrated transducers, at the upper ends of which local temperature transducers are installed, and at the lower ends, local temperature and hydrostatic pressure transducers connected by cable cables, characterized in that the composition of the system for measuring the depth of the thermocline from a drifting vessel additionally introduced a small craft with one of the mentioned measurements length of lines established with the ability to maintain its position relative to the drifting vessel, with the remaining measurement lines placed at the bow and stern of the vessel.

Description

Utility Model Name

System for measuring the depth of the thermocline from a drifting vessel

The technical field to which the utility model relates.

The utility model relates to the field of measurement technology, and more specifically to devices for measuring the topography of a thermocline (temperature jump layer) and can be used, for example, to determine the amplitude, period, speed, direction of propagation of sea internal waves.

State of the art

A known system that can be used to measure the depth of the thermocline (Stepanyuk IA "Methods of measuring the characteristics of marine internal waves" St. Petersburg: ed. RGTMU, 2002. S. 62-63) including an integrated temperature sensor and a hydrostatic pressure sensor mounted on standard oceanographic cable with a load at the end. The integrated temperature sensor is located at the depth of the thermocline, so that approximately the middle of the converter coincides with this depth. The hydrostatic pressure sensor is located at a depth where there are no pressure variations from surface waves. In this design, the pressure sensor generates a signal corresponding to the vertical displacements associated with the rolling of the vessel, this signal is subtracted from the signal of the integral transducer. This eliminates the distortions associated with the vertical movements of the vessel, and at the output of the measuring device, a signal is generated associated with the natural causes of the position of the thermocline.

The described device allows you to very accurately record the amplitude of the thermocline oscillations and does not allow to measure the spatial spatial variations of the thermocline oscillations. First, measurements are made under the assumption that the average temperature is kept constant above and below the thermocline on a depth scale; in the ocean, they can be characterized by significant temporal variability. Secondly, according to the measurement data by one such device it is impossible to describe the spatial variability of the thermocline oscillations, for example, to determine the speed and direction of propagation of its perturbations associated with the passage of internal waves.

Closest to the proposed technical solution (prototype) is a system for measuring the characteristics of internal waves in the course of the ship (Stepanyuk IA "Methods of measuring the characteristics of sea internal waves" St. Petersburg: ed. RGGMU, 2002. p. 64-65). For measurements, the array of transducers towed behind the vessel with a fixed spacing is used. The lattice consists of four vertically distributed measuring lines containing thermo-integrated transducers, at the upper ends of which local temperature transducers are installed, and at the lower ends - together local temperature and hydrostatic pressure transducers. The spacing of the lines in space is provided with the help of buoys of a special design, and the deepening with the help of grating-burrows. Signals are transmitted via cable cables.

Accurate determination of the amplitude of the thermocline oscillations is possible according to the measurement line with scaling on the height scale due to local temperature sensors located on the upper and lower ends of the integral transducer. At the same time, by subtracting the readings of the pressure sensor from the readings of the corresponding integral temperature sensor, as in the previously described device, the readings associated with the influence of surface waves are corrected. By changing the time of arrival of the thermocline perturbations to each of the sensors and the known distance between them, the period of the thermocline oscillation, the length, direction and propagation velocity of the internal wave that caused it are determined.

In this design, it is possible to determine almost all the characteristics of the thermocline oscillations associated with the manifestations of internal waves (period, length, amplitude, velocity and direction of wave propagation). However, the definitions still contain significant errors, since all definitions of the spatial variability of the thermocline oscillations are carried out under the assumption that the distance between the integral temperature converters is constant, however, under conditions of drift, the cable systems, when not loaded, will make arbitrary movements relative to each other.

Utility Model Disclosure

The technical result from the use of this utility model is to increase the accuracy of determining the spatial characteristics of the thermocline oscillations during measurements from a drifting vessel. This can be achieved by reducing the error in determining the relative position between the measuring lines.

The proposed device uses some of the essential features of the prototype, namely, it uses a grid of transducers with a spatial spacing for measuring perturbations of the thermocline in space. The lattice consists of vertically distributed measuring lines containing thermo-integral transducers, at the upper ends of which local temperature transducers are installed, and at the lower ends - together local temperature and hydrostatic pressure transducers. Signals are transmitted via cable cables.

Significant distinguishing features of the proposed device is that the composition of the system for measuring the depth of the thermocline from a drifting vessel is additionally introduced a small craft with one of the mentioned measuring lines, installed with the ability to maintain its position relative to the drifting vessel, and the remaining measuring lines are located at the bow and stern vessel. This reduces the error in determining the spatial variability of the characteristics of the thermocline in a vessel drift.

Brief Description of the Drawings

The invention is illustrated in the drawings. Figure 1 presents the layout of the measuring lines. The measuring lines 1 and 2 are lowered from the bow and stern of the main vessel 3, and the measuring line 4 from the board of a small craft (boat) 5 located at a fixed distance from the vessel. All measuring lines are connected by cable ropes 6. The distance between 3 and 5 when monitoring the tension of the cable cable remains constant.

Utility Model Implementation

The system operates as follows. The depth of the thermocline is determined. The measuring lines are installed from the bow and stern of the vessel, so that the middle of the integral temperature sensors is at the depth of the thermocline. The third sensor is loaded onto a small craft (boat). The equipment of the boat for work is supplemented by a compass and a control halyard attached to the side of the vessel. A small ship departs from the board of the main ship at a predetermined distance with a course directed normal to the side of the ship. When the signal line is pulled, the boat stops, the third line is installed. The further task of the boat crew is to monitor the halyard and compass readings and visual landmarks in order to maintain their position. The exact determination of the amplitude of the thermocline oscillations, as in the prototype, is provided according to the measurement line with scaling on the height scale. By changing the time of arrival of the thermocline disturbances to each of the sensors and the precisely specified distance between the sensors along the side of the vessel, the position of the sensor on the boat that is constantly monitored, the period, length, direction and propagation velocity of the thermocline oscillation are determined.

Claims (1)

A system for measuring the depth of a thermocline from a drifting vessel, containing vertically distributed measuring lines of thermo-integrated transducers, at the upper ends of which local temperature transducers are installed, and at the lower ends, local temperature and hydrostatic pressure transducers connected by cable cables, characterized in that the composition of the system for measuring the depth of the thermocline from a drifting vessel additionally introduced a small craft with one of the mentioned measurements length of lines established with the ability to maintain its position relative to the drifting vessel, with the remaining measurement lines placed at the bow and stern of the vessel.