雷达测流的基本原理是基于流速面积法。断面一定时间内的流量=平均流速*水流截面积。通过雷达流速传感器探头可以获取表面流速，根据雷达流量计内置的流速模型，通过预先设定的断面参数，将雷达测得的表面流速转化为断面平均流速；通过雷达水位传感器探头可以获取断面水位/水深，雷达流量计结合断面几何参数，自动算出断面面积，根据流速面积法公式，求得流量。

This solution employs the ultrasonic time-of-flight (ToF) principle to design an online monitoring system for open channel flow. It enables real-time measurement of water flow velocity and water level in open channels, calculates accurate discharge data, and provides scientific support for water resource management and allocation.

This solution utilizes the ultrasonic time-of-flight (ToF) principle to establish an online monitoring system for open channel flow. It enables real-time measurement of water velocity and water level in open channels, calculates accurate discharge data, and provides scientific support for water resource management and allocation.

The HJ-UT-C Series Ultrasonic Flow Meter, independently developed by Shenzhen Huaju Scientific Instruments Co., Ltd., is a high-performance device based on the ToF measurement principle. Featuring a U-shaped integrated structure, it is tailored for precise flow monitoring in hydraulic engineering, agriculture, and irrigation channels.