流速对水平式多普勒流速仪应用的影响
Influence of Velocity on the Horizontal Doppler Current Meter

水平式多普勒流速仪(H-ADCP)，多用于中低水位的流量监测，在实际应用中发现即使在含沙量不大而流速偏大的情况下，H-ADCP监测的流量与缆道流速仪的实测流量也存在一定的不相应，流速会成为H-ADCP测量的重要影响因素。流速的变化对仪器的工作状态曲线虽无规律性改变，但对收集数据的准确性有很大的影响，从而影响资料的可靠性。需要通过多次与标准流量比测，结合测站特性综合判定，确定出洪水量级使用范围，超出范围时应加强同步的比测分析。本文结合具体实例，分别从含沙量与流速的不同组合，分析含沙量、流速对H-ADCP的具体影响，提高H-ADCP的应用水平。
The horizontal Acoustic Doppler Current Profiler (H-ADCP) is restricted by sediment concentration, and is mostly used for flow monitoring of low and middle water levels. It is found in practical application that even if the sediment concentration is small and the flow rate is too high, the flow monitored by H-ADCP does not correspond to the flow measured by the cableway current meter method to a certain extent, and the flow rate will become an important influencing factor for H-ADCP measurement. Although the change of flow rate has no regular change to the working state curve of the instrument, it has a great impact on the accuracy of the collected data, thus affecting the reliability of the data. In practical application, it is necessary to determine the scope of use of flood magnitude through multiple comparisons with standard flow and comprehensive judgment based on the characteristics of the measuring station. If the scope is exceeded, synchronous comparison and analysis should be strengthened. This paper analyzes the specific impact of sediment concentration and flow velocity on H-ADCP from different combinations of sediment concentration and flow velocity with specific examples to improve the application level of H-ADCP.