Portable Doppler flowmeter

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How to calculate the water flow velocity in a canal?

The calculation of water flow velocity in a canal can be achieved through formula derivation or professional equipment measurement. The specific methods are as follows:

1. Formula calculation method The water flow velocity in a canal can be calculated by the relationship between flow rate and cross-sectional area. The core formula is: flow velocity (V)=flow rate (Q)/cross-sectional area (A). Unit explanation: Flow velocity is in meters per second (m/s), flow rate is in cubic meters per second (m3/s), and cross-sectional area is in square meters (m2).

. Parameter acquisition: Flow rate (Q): can be directly measured through a flow meter, or indirectly calculated through parameters such as water level and flow rate. Sectional area (A): It needs to be calculated based on the geometric shape of the water channel. For example, the cross-sectional area of a rectangular canal is width (B) x depth (H). Example: If a rectangular canal has a width of 2 meters, a depth of 1.5 meters, and a flow rate of 3 m3/s, the flow velocity is V=3/(2 × 1.5)=1 m/s. Figure: Schematic diagram of the cross-section of the rectangular canal.

Secondly, the formula for equipment measurement method calculation requires known flow rate and cross-sectional area, while equipment measurement can directly obtain flow velocity data, which has stronger real-time performance. The common equipment is as follows: 1. Principle of radar flowmeter: Based on the Doppler effect, it detects the surface velocity of water flow by emitting microwave radar. Features: It is not affected by environmental factors such as temperature, pressure, and air density, and can work 24/7. Using imported rada

r antennas, with high measurement accuracy and wide range (usually 0.02-20 m/s). Equipped with tilt compensation and gain adjustment functions, easy to install. Application scenario: Surface velocity monitoring of water flow in rivers, open channels, underground sewage wells, etc., which can be connected to a water level gauge to form a flow monitoring system. Figure: Installation diagram of radar flowmeter 2 Principle of handheld radar flowmeter: Based on the Doppler effect, but with a portable design, suitable for on-site measurement. Features: Non contact measurement, avoiding interference from sewage and sediment. Easy to operate, built-in tilt angle measurement function, can quickly obtain flow velocity data. Application scenarios: Temporary monitoring, emergency measurement, or scenarios where it is difficult to install fixed equipment

3. Principle of Doppler flowmeter: By emitting ultrasonic waves into the water flow, the propagation speed and frequency changes are measured to calculate the flow velocity. Features: Suitable for various water channels and flow velocity ranges (usually 0.01~10 m/s), with high precision sensitivity (± 1%). Continuous measurement of flow rate and flux, easy installation and maintenance, high reliability. Application scenario: Projects that require long-term accurate monitoring, such as irrigation channels, industrial drainage pipes, etc. Figure: Schematic diagram of installation of Doppler flowmeter

III. Recommended formula for method selection Calculation: Suitable for scenarios with known flow and cross-sectional area, low cost but requires regular parameter calibration. Equipment measurement: radar flowmeter or Doppler flowmeter are preferred, especially suitable for dy

How to calculate the water flow velocity in a canal?

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