【JD-ML3】， Shandong Jingdao Optoelectronics has been deeply cultivating hydrological equipment for ten years.

In the field of water conservancy, accurate monitoring of open channel flow is crucial for water resource management, flood control, and other work. Radar flow meters have shown unique advantages in open channel monitoring, especially their high-precision radar probes, which play a key role in emergency flow monitoring during flood periods.

High precision radar probe: the core of precise measurement

Working principle of probe

The high-precision radar probe of the radar flowmeter works based on microwave radar technology. The probe emits high-frequency microwave signals towards the surface of the open channel, and the microwave signals reflect off the water surface, and the reflected waves are received by the probe. Due to the fluctuations of the water surface and the movement of the water flow, the frequency of the reflected wave will differ from that of the emitted wave, resulting in a Doppler shift. By accurately measuring the Doppler frequency shift, combined with parameters such as microwave emission frequency and beam angle, and using relevant algorithms, the water surface velocity can be calculated.

At the same time, the radar probe can accurately calculate the distance from the probe to the water surface by measuring the time difference between the transmitted wave and the reflected wave, combined with the propagation speed of microwaves in the air, in order to obtain water level information. By obtaining real-time water level and flow velocity data, combined with the cross-sectional information of the open channel, and using the flow calculation formula, the flow rate of the open channel can be obtained.

High precision embodiment

High precision radar probes demonstrate excellent measurement accuracy in multiple aspects. Firstly, in terms of flow velocity measurement, it can accurately distinguish small changes in flow velocity. Its measurement accuracy can reach a high level, which can meet the flow velocity measurement needs under various complex water flow conditions. Even during flood periods, where water flow velocity changes rapidly and there may be significant velocity gradients, high-precision radar probes can accurately capture these changes and provide precise velocity data for flow calculation.

In water level measurement, the accuracy is also excellent. Being able to accurately measure subtle changes in water level, providing accurate water level information for flow calculation. It can provide high-precision water level data stably, whether it is during normal water level fluctuations or rapid rise or fall of water level during flood periods. This high-precision water level measurement is crucial for accurate flow calculation, as small errors in water level may lead to significant deviations in flow calculation results.

In addition, high-precision radar probes also have good anti-interference ability. In practical applications, there may be various sources of interference around open channels, such as nearby buildings, other electronic devices, etc. But by using advanced signal processing techniques, the radar probe can effectively filter out these interference signals, ensuring the accuracy and reliability of the measurement data. Even in complex electromagnetic environments, it can work stably and provide accurate data support for open channel flow monitoring.

Emergency monitoring of flow during flood season: a powerful guarantee for responding to emergency situations

Quick response and real-time monitoring

During flood periods, time is life, and rapid response and real-time monitoring of flow are crucial. The radar flowmeter, with its high-precision radar probe, can quickly start and monitor the flow rate of open channels in real time. Once a flood arrives, the probe immediately starts working, quickly obtaining flow velocity and water level data, and quickly calculating the flow rate through the internal data processing system. Its response speed is extremely fast, and it can provide accurate flow information in a short period of time, providing timely data support for flood control decisions.

The real-time monitoring function enables relevant departments to grasp the dynamic changes in open channel flow during floods at any time. Whether it is the rapid increase in traffic, peak occurrence, or subsequent decline process, it can be tracked and monitored in real time. This real-time capability allows flood control command departments to adjust their response strategies in a timely manner based on changes in flow, such as reasonable scheduling of water conservancy facilities, organizing personnel evacuation, etc., to reduce losses caused by flood disasters.

Reliable monitoring in harsh environments

The environment during flood periods is often extremely harsh, with heavy rainfall, strong winds, and turbulent water flow posing significant challenges to flow monitoring. However, the high-precision radar probe of the radar flowmeter has excellent adaptability and can work reliably in harsh environments.

In heavy rainfall weather, rainwater may have a certain impact on radar signals, but high-precision radar probes can effectively eliminate rainwater interference and accurately measure flow velocity and water level through optimized signal processing algorithms. Even in strong winds, the probe can still stably transmit and receive microwave signals, unaffected by wind force, ensuring the continuity and accuracy of flow monitoring.

In the face of turbulent water flow, the non-contact measurement advantage of radar probes is fully demonstrated. It will not be damaged or affect measurement accuracy due to water flow impact like some contact measuring devices. On the contrary, being able to accurately measure flow velocity in turbulent water flow provides reliable data for flow monitoring during flood periods, helping to facilitate the smooth progress of flood prevention and control work.

Data accuracy and warning function

During flood periods, the accuracy of flow data directly affects the effectiveness of flood control measures. The high-precision radar probe of the radar flowmeter ensures the high accuracy of the measurement data, providing a reliable basis for flood control decision-making. Accurate flow data helps flood control command departments accurately assess the scale and impact range of floods, allocate flood control resources reasonably, and develop scientific flood control plans.

At the same time, the radar flowmeter also has a warning function. By setting a preset traffic alert value, the system will immediately issue a warning signal when the monitored traffic approaches or exceeds the alert value. Warning information can be conveyed to relevant departments and personnel in a timely manner through various means, such as text messages, phone calls, alarms, etc. This enables flood control personnel to be informed of the danger of floods in a timely manner and quickly take response measures, such as strengthening dam inspections, organizing mass transfers, etc., effectively ensuring the safety of people's lives and property.

Wide application of radar flowmeter in open channel monitoring: serving water conservancy and social development

Flood Control Command

In flood prevention and control work, radar flowmeter open channel monitoring provides key support for command and decision-making. Real time and accurate flow data help flood control command departments comprehensively understand the development trend of floods and arrange flood control forces reasonably. For example, according to changes in flow, timely scheduling of reservoir flood discharge, controlling the flow of downstream rivers, and reducing the pressure of floods on coastal areas. At the same time, by monitoring the flow of different river sections, the direction and speed of flood evolution can be determined, and relevant flood prevention preparations can be made in advance to improve the scientific and effective nature of flood prevention and control work.

Water conservancy project scheduling

For various water conservancy projects, such as dams, water gates, etc., radar flowmeter open channel monitoring helps optimize project scheduling. During flood periods, by monitoring the flow of upstream and downstream engineering in real time, adjusting the discharge capacity of dams and the opening of water gates reasonably, the safe operation of water conservancy projects can be ensured. At the same time, according to changes in flow, reasonable arrangements should be made for irrigation water, power generation water, etc., to achieve the rational utilization of water resources. During non flood periods, monitoring flow can also be used to promptly identify potential issues in the project, such as leakage, ensuring the long-term stable operation of water conservancy projects.

Water Resource Management and Protection

In terms of water resource management, radar flowmeter open channel monitoring provides accurate flow data, providing a basis for water resource assessment and planning. By long-term monitoring of open channel flow, understanding the spatial and temporal distribution of water resources, and formulating reasonable plans for water resource development and utilization, we can promote the sustainable use of water resources. In terms of water resource protection, monitoring changes in flow can help detect water pollution events in a timely manner. When there is an abnormal change in flow rate accompanied by water quality problems, it may indicate that a pollution source has entered the water body. Relevant departments can take timely measures to identify the pollution source and carry out treatment to protect the quality of water resources.

Radar flow meters have significant advantages in open channel monitoring, especially in emergency flow monitoring during flood periods, thanks to their high-precision radar probes. Its wide application in flood control command, water conservancy project scheduling, water resource management and protection, etc., provides important guarantees for the development of water conservancy and social stability, and is of great significance for safeguarding people's lives and property safety and promoting sustainable economic and social development.