ADCP Doppler flowmeter | What equipment can be used to measure flow at the spillway gate | Ningxia ultrasonic flowmeter manufacturer

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1. How to calculate the total outflow of Hongze Lake?

The calculation of the total outflow of Hongze Lake mainly uses hydraulic engineering formula method, flow velocity area method or real-time monitoring method of technical equipment.. The specific calculation method needs to be combined with actual monitoring conditions and engineering structural characteristics. The following is a detailed explanation:

1. Hydraulic engineering formula method: If the lake channel is controlled by a gate (such as a radial gate or a flat gate) based on standardized calculation of structural parameters, the gate opening, head height, and gate shape parameters need to be combined to calculate the flow rate through the standard discharge formula. For example, when the outflow channel is a wide topped weir structure, the formula can be used: $Q=C times b times H ^ {3/2} $, where $C $is the flow coefficient (usually taken as 1.5-2.2, calibrated according to the weir material and flow conditions), $b $is the weir crest width (unit: meter), and $H $is the water head height above the weir (i.e. the vertical distance from the weir crest to the water surface, unit: meter). This method is suitable for engineering scenarios with stable structures and clear parameters, but requires regular calibration of coefficients to reduce errors.

2. Flow velocity area method: Based on actual measurement data, dynamic calculation is used to calculate the total flow rate by measuring the average flow velocity of the cross-section and the cross-sectional area of the water passage. The formula is: $Q=$x_ {text {average}} times A_ {text {cross-section} $, where $x_ {text {average} $is the average flow velocity of the cross-section (unit:

meter/second), which can be measured by Doppler flow meters and other equipment;

; $A_ {text {section}} $is the cross-sectional area of the water passage (unit: square meters), which needs to be calculated based on the water level and the shape of the river channel. For example, Doppler flow meters use changes in ultrasonic reflection frequency to calculate flow velocity, with an error controlled within 5%, making them suitable for short-term or dynamic monitoring tasks. 3. Real time monitoring of technical equipment: Automated data output uses devices such as Doppler flow meters and acoustic Doppler profiling (ADCP) to synchronously monitor flow velocity and water level, and automatically calculate flow rate through the data platform. This type of device is suitable for long-term tasks such as ecological traffic monitoring and can provide real-time and continuous traffic data. For example, on September 17, 2025, the total outflow of Hongze Lake was 454 cubic meters per second, which was monitored and provided by the Jiangsu Provincial Hydrological and Water Resources Survey Bureau through such equipment.

Fourth, regardless of the method used, data validation and calibration must be verified by comparing measured data with historical records.

. For example, the coefficients of the hydraulic engineering formula method need to be adjusted according to the actual discharge situation; The cross-sectional measurement of the velocity area method needs to consider the changes in river channel erosion and deposition; Equipment monitoring data requires regular calibration of sensor accuracy. The final flow data needs to be reviewed and released by the hydrological department to ensure its scientific and authoritativ

ADCP Doppler flowmeter | What equipment can be used to measure flow at the spillway gate

1. How to calculate the total outflow of Hongze Lake?

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