ADCP open channel flowmeter | radar open channel flowmeter

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1. Methods for measuring water level and flow rate

The core methods for measuring water level and flow rate are divided into two categories: open channel flow measurement and pipeline flow measurement. The mainstream solutions are based on principles such as velocity area method and water level flow rate relationship method. The specific adaptation scenarios and operational details are as follows

1. Methods for measuring water level and flow rate in open channels. Open channels refer to water channels, rivers, drainage ditches, etc. with free water surfaces, and are the most common flow measurement scenarios. There are four mainstream methods: • Velocity area method 1 First, measure the average flow velocity of the cross-section using buoy method, propeller flowmeter, and acoustic Doppler current profiler (ADCP) Measure the cross-sectional area of the water passage using a water level gauge and radar water level gauge, and multiply the flow velocity by the area to obtain the flow rate of 3 Suitable for natural rivers and large channels, ADCP can achieve non-contact real-time flow measurement with an accuracy of ± 2% • Water level flow relationship curve method 1 Establish a one-to-one correspondence curve between water level and flow rate by conducting multiple measurements of flow rate, water level, and flow rate data at a fixed measuring station in advance Subsequently, only the current water level needs to be measured, and the corresponding flow rate can be obtained by directly checking the table through the curve Suitable for long-term fixed monitoring stations, eliminating the step of measuring flow velocity each time, suitable for hydrological monitoring scenarios • Weir channel flow measurement me

thod 1 By installing standard water measuring facilities such as thin-walled weirs, wide top weirs, and Bacher troughs in the channel, the flow rate is calculated using a fixed formula for the water level difference and flow rate when the water flows through the weir trough Thin walled weirs are suitable for precise measurement of small flow rates, while Bacher troughs are suitable for sewage channels containing sediment, without the need for separate measurement of flow velocity and cross-sectional area It is necessary to strictly install the weir according to the standard to ensure that the water flow is in a critical state. Ultrasonic flow measurement method 1 By installing ultrasonic probes on both sides of the channel, transmitting and receiving ultrasonic signals in both upstream and downstream directions, the average flow velocity of the water is calculated to be 2 By combining the cross-sectional area of the channel to obtain the flow rate, non-contact real-time monitoring can be achieved, which is suitable for unmanned outdoor scenarios There are three mainstream methods for measuring water flow in pipelines, namely the differential pressure flowmeter method, which is used to excite the confined water flow inside the pressure pipeline By installing orifice plates, Venturi tubes, and other throttling devices inside the pipeline, the pressure difference before and after throttling is measured, and the flow rate is calculated using the Bernoulli equation It is the most commonly used method for industrial pipeline flow measurement, mature and stable, with an accuracy of ± 0.5% • Electromagnetic flowmeter method 1 Using Faradays law of electromagnetic induction, measure the induced potential generated by the flow of

ADCP open channel flowmeter | radar open channel flowmeter

1. Methods for measuring water level and flow rate

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