SU1643933A1 - Method for measuring water discharge through open river course - Google Patents

Abstract

The invention relates to hydrometry and permits an increase in the accuracy of the determination of the water flow due to a more thorough consideration of the hydraulic parameters. The method consists in the fact that in the process of moving the measurement point across the width of the watercourse, its velocity is maintained within 0.2-0.8 flow velocity. The flow velocity is measured in a plane perpendicular to the alignment line. The measurement point is moved in depth at a distance of 0.1 - 1.2 m from the surface of the stream. Water flow is determined by the formula.

Description

The invention relates to hydrometry and can be used to determine the flow rate of water in the gauging sections of open channels.

The aim of the invention is to improve the accuracy of determining the water flow due to the full consideration of the hydraulic parameters.

In this method, continuous and synchronous measurement of local flow velocities and flow depths is determined when the velocity of the solution is 0.2-0.8, the flow velocity is measured in a plane perpendicular to the alignment line, the measurement point is moved in depth at a distance of 0.1–1.2 m from the surface of the stream, and the water consumption is calculated by the formula:

M

Q UK;

h b v

where Ы is the number of measurements ();

average flow rate at d.th metering, m / s; Average depth at i-th measurement, m;

distance between measurements, m;

transition coefficient from measured to average speed, at 2 m, K; one,

h b- C- OO

with

at hj 2 m K

(B;) 3

where 1, d are parameters depending on

flow hydraulics at a specific site.

To implement the method, the measuring complex is installed on a hydrometric ferry or other self-propelled vessel. The equipment complex includes an echo sounder, an electromagnetic telemetry unit for controlling the position of a velocity meter, a unit for converting the signals of the echo sounder and a turntable, a frame-carriage,

With the beginning of the movement, the flow rate elements are continuously recorded and processed: speed, depth, width, measurement time. The carriage frame constantly holds the hydrometric spinner in a position perpendicular to the gauge. In the electronic unit, a pulse meter is used to measure the speed meter, the number of echo sounder parcels, and first calculate the elementary costs, and then integrate them. The movement control of the turntable mounted on the rod is automatically conducted according to the echo sounder as follows. At depths of more than 2 m, the fan is constantly held at a depth of 1.2 m from the surface of the stream. At depths of less than 2 m, the turntable is constantly moved to 0.6 of the flow depth, which corresponds to the average speed on the vertical.

The information on the depth and speed of the flow enters the form of electrical signals on the mini-computer, where it is recorded and processed during the measurement process. Elementary flow rate is calculated for the time of one impulse of the fan.

Depending on the width of the water course, the total time for measuring the water flow is 10-30 minutes.

Form of the invention The method of determining the flow of water in the open channels, consisting in continuous and synchronous measurement of the local velocity and depth of the flow while continuously moving the measurement point across the width of the watercourse, which determine the flow rate, characterized in that, in order to increase accuracy, the movement of the point measurements are carried out at a speed of 0.2–0.8 of the flow velocity, the flow velocity is measured in a plane perpendicular to the alignment line, and the depth measurement point is moved at a distance of 0, 1 - 1.2 m from the surface of the stream, and the flow rate Q of water is determined by the formula N

Q v;

where N is the number of measurements;

average flow rate at the i-th measurement, m / s; Average depth at i-th measurement, m;

distance between measurements, m;

the transition coefficient from the measured to the average speed at h, 2 m, K (1, at h; 2 m K; l / (h.) d, where 1, d are parameters depending on the flow hydraulics at a particular point.

I / b ;,

v i - 1

h Kj

Claims (1)

SUMMARY OF THE INVENTION A method for determining the flow rate of water in open channels, which consists in continuously and synchronously measuring the local velocity and depth of the stream while continuously moving the measurement point along the width of the watercourse, which determine the flow rate, 1Q characterized in that, in order to improve accuracy, the movement measurement points are carried out at a speed of 0.2 - 0.8 flow rates, the measurement of flow rate is carried out in a plane perpendicular to the alignment line, while the measurement point is moved in depth at a distance 0.1 - 1.2 m from the surface of the stream, and the flow rate Q of water is determined 2Q by the formula N Q = · *; · b ;. b _; , N is the number of measurements; v <is the average flow velocity at the ith measurement, m / s; h · is the average depth at the i-th measurement, m; bj - distance between measurements, m; Kj is the transition coefficient from measured to average speed at h · <2 m, K; = 1, for h;> 2 m K. = 1 / (h.), Where 1, d are parameters that depend on the hydraulics of the flow in a particular site. where. Compiled by N. Burbelo