A non-contact flow measurement method based on the flow velocity measurement of representative vertical points

Abstract

The invention discloses a non-contact flow measurement method for measuring a high flood based on the flow velocity of representative vertical line points. The method includes the following steps of (1) determining the positions of one or more vertical lines according to river section data, and using a radar flow velocity meter to measure the flow velocity of a river surface point below a measured vertical line; (2) calculating the flow velocities V1-Vp (the surface point flow velocity of P vertical lines) of the surface points of multiple vertical lines according to the surface point flow velocity of the measured vertical line; (3) conducting arithmetic average on the section surface point flow velocity of the multiple vertical lines, and obtaining the average flow velocity Vsur of the river surface; according to the empirical formula of hydraulics, making the average flow velocity of the river surface multiplied by the surface velocity coefficient lambda to obtain the average flow velocity Vave of the section; (4) according to the river section data, obtaining the river water passing section area corresponding to the set water depth, and making the area multiplied by the average flow velocity of the section to obtain a river flow value. The method can calculate the flow of artificial and natural rivers quickly, conveniently and accurately, and is especially suitable for unattended heavy rain, high flood and other complex disastrous environments.

Description

technical field [0001] The invention relates to a non-contact flow measurement method for measuring high flood based on the flow velocity at a representative vertical point, and belongs to the technical field of river flow measurement. Background technique [0002] Since the 1960s, hydrological stations at home and abroad have gradually adopted the "velocity-area" method based on artificial rotor-type current meters to measure river discharge. The advantages of this method are simplicity, low equipment cost, and accurate and reliable measurement data, so this method is still the main method of river flow measurement in my country until today. Commonly used contact flow measurement methods include rotor flow meter flow measurement method, buoy flow measurement method, ADCP (Doppler radar profiler) flow measurement method, etc. [0003] The disadvantage of the flow measurement method of the rotor type current meter is that it cannot be used in disaster environments such as he...

AI Technical Summary

Problems solved by technology

This method requires the cooperation of several staff members to successfully complete the measurement. Obviously, in the case of high-speed water flow such as mountain torrents, this method cannot guarantee the safety of the staff's lives.

ADCP flow measurement methods usually include horizontal ADCP (H-ADCP) flow measurement method, vertical ADCP (V-ADCP) flow measurement method, and sailing ADCP ship measurement method. Since both H-ADCP and V-ADCP flow measurement require the The sensor is installed below the water surface. Obviously, this way of working will make the maintenance of the equipment complicated and unsafe. During the flood, the safety of the measurement will also be reduced due to various unstable reasons.

Images