A water level gauge for river engineering test and its parameter calibration method

Abstract

The invention discloses a river engineering test water level gauge and a parameter calibration method thereof. The water level gauge includes a water level measuring device, a water tank, a probe for measuring the reference water level of the water tank, and a pressure sensor connected with the water tank and used for measuring the water outlet pressure of the water tank. A floating plate is fixedly arranged under the pressure sensor, and an ultrasonic probe opposite to the pressure sensor runs through the center of the floating plate, and both the ultrasonic probe and the pressure sensor are electrically connected to the water level measuring device. The parameter calibration method includes measuring the water level of the water cylinder z 盛水量筒 ; Measure the reference water level of the water tank z a , the vertical distance between the end face of the pressure sensor and the reference water level h 1 , the vertical distance between the end face of the ultrasonic probe and the water surface of the measuring cylinder h ;pass h 2 = z a - z 盛水量筒 - h 1 - h Obtain the vertical distance between the end face of the ultrasonic probe and the end face of the pressure sensor h 2 . Significantly reduce the observation links and human factors of the level follow-up method, reduce the influencing factors of the observation accuracy, and improve the observation accuracy.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering measurement, in particular to a river engineering test water level gauge and a parameter calibration method thereof. Background technique [0002] As one of the basic hydrological elements indicating the flood conditions of rivers and reservoir areas, water level is an important part of water regime information and an important basis for flood control scheduling and flood forecasting. Therefore, water level has always been the main content of water conservancy engineering research, a necessary parameter for flood control, channel and bridge engineering design, and a must-measure content for hydraulic and river engineering model test research. [0003] At present, the instruments used for water level measurement of hydraulic and river engineering models mainly include stylus water level gauges, ultrasonic water level gauges, etc. Among them, the stylus water level gauge measur...

AI Technical Summary

Problems solved by technology

However, the above two fixed water level gauges can only measure the water level of one measuring point, while the general mountain waterway model needs more than 200 measuring points, so there will be the following technical problems: First, the cost of measuring instruments has increased significantly and occupies a large amount of water. It is very difficult to arrange the test space in the test site; second, the position of the measuring points is often changed during the test due to program optimization and other reasons, and most of the measuring points cannot be foreseen in advance, so it is difficult to use fixed water level gauges for measurement; third, the installation of fixed water level gauges is very time-consuming , will greatly prolong the test and research time; fourth, due to too many and too dense measuring instruments, collisions and displacements often occur during the test process, and it often takes a lot of time to re-check the zero point, which also affects the measurement accuracy

[0005] (1) Labor-intensive: Due to the need for follow-up reading of the level gauge, the measurement generally requires 5 people to complete at the same time (level reading, recording, leveling rod control, precise positioning, water level gauge reading)

[0006] (2) Time-consuming: Since each measuring point of the level follow-up method needs to be re-measured at the zero point, and the observation time of the focus, direction, and leveling of the level is relatively long, and a working condition requires a large number of measuring points. There are many observation links, and a working condition takes a long time, which is very time-consuming

[0007] (3) Limited accuracy: due to many observation links, most of which are manual links, the measurement accuracy is significantly affected

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