基于垂线流速模型的雷达法断面流量测流精度分析

利用雷达多普勒流速仪进行测流是目前成本较低的实时自动测流方法。传统的雷达多普勒流速仪获得断面单条垂线上的表面流速，一般采用代表流速法建模计算断面流量，导致水位变幅剧烈的断面测流误差较大。本文基于表面流速数据的垂线法测流模型，采用雷达式二合一传感器获得断面的垂线表面流速和水深实测数据计算断面流量，并以新田水文站断面测流为例，与缆道流速仪法的测流数据结果进行对比验证。结果表明垂线平均流速相对误差在 5%以内的合格率达到 75%，断面平均流速相对误差和断面流量相对误差在 5%以内的合格率均达到 67%，故仅需布设两个雷达测速仪即可达到相对误差小于 5%的高精度测流，在自动测流站中有较好的应用。

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.