国产ADCP流速精度比测试验研究

Experimental Study on Current Velocity Accuracy Comparison of Domestic ADCPs

摘要:

针对低频 ADCP 的测速精度标检试验室条件无法满足的问题，参考国家及行业标准要求，在千岛湖采用同步比测方式进行了国产低频 ADCP 流速测量精度标检试验。通过试验区域的深度初探，结合试跑阶段的回波分析确定了比测过程的层数、层厚以及交替工作间隔时间等参数，在试验区域进行了多航速折返比测试验。试验结果显示：由于水体悬浮物少等因素，千岛湖水域的流层回波强度整体偏弱，相对而言 ADCP 近底流层测量会受到比较强的底回波干扰；利用未受干扰的流层数据对比，国产 DVLⅡ-300kHz 型 ADCP 与同频率进口 ADCP 的剖面流速测量精度相当。

Abstract:

In response to the problem that the conditions of the speed measurement accuracy calibration laboratory for low-frequency ADCP cannot be met，a domestic low-frequency ADCP current velocity measurement accuracy calibration test is conducted in Qiandao Lake using a synchronous comparison method，referring to national and industry standards. Based on preliminary study of the depth of experimental area and the analysis of echo during the trial run stage，parameters such as layer number，layer thickness，and alternating working interval during the comparison process are determined. Multiple-speed turn back comparison tests are conducted in experimental area. The experimental results show that due to factors such as low suspended solids in the water，the echo intensity of the current layer in the Qiandao Lake area is generally weak，and ADCP near bottom layer measurement is affected by strong bottom echo interference. By comparing undisturbed flow layer data，the velocity profile measurement accuracy of domestic DVL II-300 kHz ADCP is equivalent to that of imported ADCP at the same frequency.