Accuracy analysis of radar-based sectional flow measurement using the vertical velocity profile model
Utilizing doppler radar flow velocity meters for flow measurement is a cost-effective real-time automated flow measurement method.Traditional doppler radar flow velocity meters obtain surface flow velocity along a single vertical line in the cross-section.Generally,the modeling calculation of cross-sectional flow is done using the representative velocity method,leading to significant measurement errors in sections with large fluctuations in water level.This article analyzed and studied a vertical flow measurement model based on surface velocity data.The vertical surface velocity and water depth measurement data of the cross-section were obtained using a radar type two in one sensor to calculate the cross-section flow.Taking the cross-section flow measurement at Xintian hydrological Station as an example,the results were compared and verified with the flow measurement data of the cable current meter method.The results showed that the qualified rate for vertical average flow velocity with a relative error within 5%reaches 75%.The qualified rate for average flow velocity and discharge relative errors within 5%at cross-sections reached 67%.Therefore,it is sufficient to deploy only two radar velocimeters to achieve high-precision flow measurement with a relative error less than 5%.This method has shown good applicability in automatic flow measurement stations.
万方数据
维普
