SU1428920A1 - Method of determining position of datum level surface - Google Patents

Abstract

The invention relates to the field of topographic and geodetic works on the sea. In order to improve the measurement accuracy, bottom measles 1 are installed at the bottom with pressure sensor 4, connected by means of cable-cable 2 of positive buoyancy to ground buoy 3. The submerged buoy contains pressure sensors 5, salinity 6, temperature 7 and tilt angle 8 of the cable. The surface signal buoy 9 is equipped with temperature sensors 10 and salinity 11 and connected to the prits (captive buoy 3. By measuring the temperature and salinity on the sea surface and on the horizon of the submerged bu, determine the average density of water in this area, which taking into account the reading Pressure sensor 5 allows determining the difference between a buoy and a sea level. From the measured angle of cable cable 2, the depth below the buoy is calculated, adding it to the sealed buoy depth below sea level. The depth of the sea at the location of the signal buy 9 is determined. Using the readings of the sensors 4, 5, 6.7, 8, 10, 11, the value of the average density of sea water at the station is determined vertically. radio station. 1 ill. (rt C 4 tc 00 with to

Description

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The invention relates to topographic and geodetic works on the seas and inland waters and can be used for water leveling and oceanographic research

. The whole invention is an increase in the measurement accuracy “

The drawing shows a level post in a vvde autonomous buoy mill cddi, a general view from

Ground bore 1 is associated with a cable-tropism 2 positive buoyancy (for example, e with a propylene sheath) with a floating and carrying buoy 3, which is: deeper than the minimum at an erosion level (at a preliminary t The floatant-buoyancy of the cable-cable is necessary in order to ensure that the cable is cabled from the flowed-down cable to the bottom of the cable, which is achieved due to the lifting of the cable and the need for more accurate calculation. burial depths of buried buried limes e cable ™ of the cable and the measured fy of its angle of inclination. The hydrostatic pressure & 4 has been installed on the cortex and the following sensors are placed in the case: 5, salinity 6 temperature

7 and the angle of inclination 8 cable cable relative vertical: 8, Both sensors 4

Hi 5 pressure have a damping device j eliminating the influence of wind waves. For contact with the coastal (ship) center, a surface signal buoy 9 is equipped with a signal converter and a radio station

Temperature sensors 10 and salinity 11 are also attached to the signal surface buoy to determine the corresponding values on the surface.

The quality of these sensors uses standard oceanographic instruments. The cable tilt angle gauge is a potentiometer. I.PI is a hydrostatic sensor

The method is carried out as follows:

Discretely in a given mode or on request from the center information from all sensors is fed to the signal converter, With the help of a counting device in the converter or directly at the center of the measured temperature and salinity on the sea surface and on the horizon

S

0

five

of the submerged bu, the average value of the water density (p) in the upper detrimental layer over the carrying buoy is determined, which makes it possible to determine the sea level (h) above it by the formula

P, pqh,

where p 0 b,

where P is the hydrostatic value

pressure J measured at the smelting buoy

. Determination of the average density over the entire water column

with

Nomu-dvom the horizon introduces a significant error, since this value undergoes significant changes in its vertical distribution, not even taking into account changes over time. The highest changeable layer in which the surface of the buoy and the submerged buoy are located is the most susceptible, making it possible to register the layer of the jump of the dense- and so on and, accordingly, reduce the errors in determining the average density

Q Based on the measured inclination angles (cf) of the cable-tether, the depth H is determined below the flushed buoy.

H K 1 COSIO,

where K is the stretch ratio of the cable | 1 - cable length.

 Then r; lubina mor H at the location of the displacer station at a given point in time is calculated as the sum of the depths under the carrying buoy and the elevation above it

H „H -« ho

By knowing the pressure of the entire water column (P), you can get the average density of sea water (5) at the station vertically

5. -r

f H7q

™ 5 - - ™ 2-. „- -

I H.p -q + P, ktp-q cosif + P,

Q According to the values of m p thus obtained for the entire network of buoy stations, the spatial distribution of the field of average density, seawater, is obtained over the entire studied area.

5 vatory

It is known that density changes have a significant effect on sea level fluctuations, and taking into account external anemobaric effects

it is possible to determine with great accuracy the leveling () of two points by the measured density values at these points

 H (r, r,)

where H is the average depth between two

stations; p - average sea density

dy at one station; PJ is the average density of sea water at the second station; Rpb is the average sea density on the surface. Learn, h something rp 1.0 g / cm and the transition to the units of conditional density, get

I H-10-3 where b. - average conditional density between two adjacent stations.

Accepting the coastal level post having an absolute mark in the height system, for the main station, by successive summation of the level increments () from station to station, the sea level deviation from them is obtained from the zero depth of the single height system

 {:. - 2. . + Gpm

where & Z Z „is the deviation of the level from zero of the depths of the unified system of heights at the nth station;

,, ,,., -. „., Is the increment of the level of 1, 2 ,, ,,., П-1 stations relative to the coastal level post. The value of LP2 and the depth of the station in

This time point allows you to transmit an absolute mark to all stations on the network.

The value of the absolute height of the level surface b Z in the observation furnace is determined by the expression f Z Z + К + h, where Z is the absolute height of the core; H, h is the excess of the submerged boo over 10 cortex and the surface bu above the primed one, taking into account the temperature and salinity of water.

F o in

rmula of invention

The method of determining the position of the level surface, which includes measuring the angle of inclination of the cable connecting the subwoofer buoy to the bottom fixed at the bottom, measuring the submerged hydrostatic pressure and calculating, characterized in that, in order to increase accuracy, simultaneously with the measurement on a submerged buoy, the hydrostatic pressure on the bark with a known altitude, temperature and salinity on the cortex, the submerged buoy and the surface buoy are measured,

connected cable cable with a para-buoy installed below the minimum possible level of the water surface, and calculations are made according to

Z Z + H + h,

where Z - absolute yysoty of the dropped surface and core; H, h - transcends of the submerged bu above the core and the surface bu above the submerged, taking into account the temperature and salinity.

Claims (1)

SUMMARY OF THE INVENTION A method for determining the position of a level surface, including measuring the angle of inclination of a cable cable connecting a submerged buoy with a hydrostatic pressure fixed to the bottom of the anchor, measuring, and calculating, characterized in that, in order to improve accuracy, simultaneously with measurements on the submerged the buoy measures the hydrostatic pressure at the anchor with a known absolute height, the temperature and salinity at the anchor, the flooded buoy and the surface buoy connected by a cable with a prismatic buoy installed below the lowest possible level of the water surface, and the calculations are made according to the dependence & Z = Z + Н + h, where AZ, Z are the absolute heights of the level surface and anchors; N, h, the excess of the flooded buoy over the anchor, and the surface buoy over the flooded one, taking into account temperature and salinity.