Accuracy, reproducibility and sensitivity of acoustic Doppler technology for velocity and discharge measurements in medium-sized rivers
Accuracy, reproducibility and sensitivity of acoustic Doppler technology for velocity and discharge measurements in medium-sized rivers
复制标题
声学多普勒技术在中型河流流速和流量测量中的准确性、再现性和灵敏度
DOI：
10.1080/02626667.2012.727999
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发表时间：
2012
影响因子：
3.5
通讯作者：
Fohrer
中科院分区：
文献类型：
--
作者：
Schmalz;Hörmann;Fohrer
随着对地表水质量和水动力学的兴趣和要求的增加，需要更多关于溪流水流的信息。采用声学多普勒技术（ADQ）的移动的OTT Qliner提供了一种高效、准确的信息收集方式。在这项研究中，我们完成了366个流速，水深和流量的ADQ测量从2010年9月至2011年6月在174个横截面在8个不同大小的集水区位于北方德国，德国中部和中国东南部。测量被用来研究的准确性，再现性和灵敏度的设备，并提高水动力采样中型河流和渠道，通过调查其内部设置。观测报告清楚地表明，ADQ获得的流量平均值，剖面，层和点值的结果与电磁或超声波装置相比非常好。一般来说，平均流速给出最高的一致性。垂直速度比层速度具有更好的质量，这表明在水平方向上比在垂直方向上更高的精度。点速度是垂直速度和层速度的合成，具有中等精度。内部设置的测试表明，测量是更敏感的细胞大小比时间间隔设置。0.1和0.2米之间的单元尺寸与深度比产生最高的可靠性。流速大于0.3 m/s时，测量周期为30 s;对于流速较浅和流速较慢的河流，建议间隔50 s或更长。测量点离河岸或河床越近，测量误差越大。河床对测量的影响也比河岸更明显。作者声明：A. MontanariCitationSong，S.，Schmalz，B.，Hörmann，G.，和Fohrer，N.，2012.中型河流流速和流量测量声学多普勒技术的准确性、再现性和灵敏度。水文科学杂志，57（8），1626-1641。
With increased interest and requirements in surface water quality and hydrodynamics, additional information is needed about water flow in streams. The mobile OTT Qliner with acoustic Doppler technology (ADQ) provides a highly efficient and accurate way of collecting this information. For this study we completed 366 measurements of flow velocity, water depth and discharge with ADQ from September 2010 to June 2011 at 174 cross-sections in eight catchments of different sizes located in northern Germany, central Germany and southeastern China. The measurements were used to study the accuracy, reproducibility and sensitivity of the device, and to improve the hydrodynamic sampling for medium-sized rivers and channels by investigating its internal settings. The observations reported clearly show that the results of flow average, profile, layer and point values obtained with the ADQ compare very well with those of electromagnetic or ultrasonic devices. In general, the average flow velocity gives the highest agreement. Vertical velocity has a better quality than the layer velocity, which indicates a greater precision in the horizontal than in the perpendicular direction. Point velocity, the composite of vertical velocity and layer velocity, has intermediate precision. Tests on internal settings revealed that measurement is more sensitive to cell size than to time interval setting. A cell size to depth ratio of between 0.1 and 0.2 m produced the highest reliability. A measurement period of 30 s is needed for velocities faster than 0.3 m/s; for shallow and slow-flowing rivers, an interval of 50 s or even greater is recommended. The closer the measured points were to the river bank or bed, the greater the measurement error. The river bed can also influence the measurement more distinctly than the river bank.EditorD. Koutsoyiannis;Associate editorA. MontanariCitationSong, S., Schmalz, B., Hörmann, G., and Fohrer, N., 2012. Accuracy, reproducibility and sensitivity of acoustic Doppler technology for velocity and discharge measurements in medium-sized rivers.Hydrological Sciences Journal, 57 (8), 1626–1641.
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