浅析水体含沙量对ADCP测流精度的影响

Analysis of the Influence of Sediment Concentration on ADCP Measurements

为提升声学多普勒流速剖面仪(ADCP)测流精度,促进水文水资源监测水平,基于水体含沙量(0~20)kg/m^(3)的流速水槽,分析了ADCP测流精密度及准确度变化特征。实验表明,ADCP测流精密度随水体含沙量增加而增加,在(0.7~0.9)m/s流速范围内,ADCP的测流精密度受含沙量影响较大,0.3 m/s时则受含沙量影响较小,ADCP的测流准确度随含沙量的增加呈现先增高后降低的变化趋势,在(9~11)kg/m^(3)含沙量范围内测流准确度较高,该范围之外,测流准确度均有不同程度的减小,此外,随着含沙量的增加,其对测流准确度的影响呈减弱趋势。相关分析及结论可为水文观测设备研制及水文科学研究提供参考。

In order to improve the accuracy and precision of the Acoustic Doppler Current Profiler(ADCP)measurements and enhance the hydrology research,based on the flow flume of sediment concentration(0-20)kg/m^(3),the ADCP measurement characteristics were analyzed.The experiments show that the precision of ADCP measurement is increased with the enhance of sediment concentration.In the flow velocity of(0.7-0.9)m/s,the precision of ADCP measurement is greatly affected by sediment concentration,when the flow velocity is 0.3 m/s,it is less affected.On the other hand,the accuracy of ADCP measurement shows a trend of first increasing and then decreasing with the increase of sediment concentration.The accuracy of ADCP measurement is higher in the concentration range of(9-11)kg/m^(3).Outside of this range,it decreases in varying degrees.In addition,with the increase of sediment concentration,its influence on the accuracy of flow measurement is weakened.The conclusions of this paper could provide references for the development of hydrology observation equipment and hydrology scientific research.