For wide or ultra-wide river channels (width >20 meters), common flow measurement methods include manual methods, cableway systems, acoustic Doppler techniques, and array-based radar wave systems. Each method has unique strengths and limitations. However, for scenarios requiring long-term online monitoring, immunity to harsh weather, operator safety, cost-effectiveness, easy installation/maintenance, non-contact operation (unaffected by sediment), and reliable performance during flood seasons, array-based radar wave flow measurement stands out as the most widely adopted and recognized solution.