ADCP Doppler flowmeter| Yaan ultrasonic flowmeter manufacturer

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1. How to measure water level and flow rate in field hydrological monitoring

Water level and flow rate measurement in field hydrological monitoring can be divided into direct measurement method and indirect calculation method, each of which has its own adaptation scenarios and operation points Water level measurement scheme 1.1: The person ruler rework direct measurement method is suitable for conventional small-scale monitoring points in the field, without the need for cumbersome equipment: - Water gauge method: fix a water gauge with a scale vertically at a stable position on the riverbed, read the intersection value between the water surface and the scale, with an accuracy of up to 1cm. Note that it is necessary to avoid backflow and floating debris areas, and regularly calibrate the verticality of the water gauge. -Float method for simple water level measurement: Place a floating object into the water surface, record the height difference between the top of the floating object and the fixed mark on the shore, and convert the water level based on the reference elevation of the fixed mark. 1.2 Automated monitoring method is suitable for long-term continuous monitoring scenarios: - Pressure type water level gauge: converts water level by measuring the static water pressure of the underwater probe, with an accuracy of ± 0.5cm, suitable for points with large water depth, and requires regular cleaning of probe attachments. -Radar water level gauge: non-contact measurement, measuring the distance to the water surface by emitting electromagnetic waves, not affected by the turbidity of the water, suitable for water areas with many floating objects and corrosiveness, and installed at a height higher than the highest

water level. -Ultrasonic water level gauge: The principle is similar to that of a radar water level gauge, and it is suitable for gentle water areas with low to medium flow rates. Attention should be paid to avoiding the interference of surface waves on sound waves. 2. Flow measurement scheme 2.1 Manual measurement method 2.1.1 Flow meter method Standard method for field hydrological flow measurement. 1. First divide the flow measurement section into multiple vertical lines, and measure the flow velocity of 2-3 measurement points on each vertical line (0.2 times the water depth below the water surface and 0.6 times the water depth position) Use a rotary propeller or rotary cup flowmeter to record the number of rotations of the propeller per unit time, and convert it to a measuring point flow rate of 3 By combining the cross-sectional area and the average flow velocity of each vertical line, the total flow rate can be calculated with an accuracy of 5% -10% through weighted averaging. When operating, it is important to pay attention to the accuracy of the depth of the flow meter entering the water, and to avoid personnel positioning affecting the water flow. The float method is suitable for emergency scenarios without professional equipment. 1. Choose a straight and stable flow measuring river section, mark the upstream and downstream sections, and record the time it takes for the float to drift from the upstream section to the downstream section. 2 Measurement of section width and average water depth, combined with buoy drift speed to calculate flow rate, has low accuracy but can quickly obtain approximate values, suitable for emergency monitoring of sudden floods

2.2 Automated monitoring method 2.2.1 Radar flowmet

ADCP Doppler flowmeter

1. How to measure water level and flow rate in field hydrological monitoring

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