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 flow velocity measurement accuracy calibration test was conducted in Qiandao Lake using a synchronous comparison method, referring to national and industry standards. Through depth exploration of the experimental area and combined with echo analysis during the trial run stage, parameters such as the number of layers, layer thickness, and alternating working interval during the comparison process were determined. Multiple speed turn back comparison tests were conducted in the 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 relatively speaking, ADCP near the bottom layer measurement will be affected by strong interference from the bottom echo; By comparing undisturbed flow layer data, the profile flow velocity measurement accuracy of domestic DVL II-300kHz ADCP and imported ADCP at the same frequency is comparable.
