Abstract
With the objective of improving the measure performance of Acoustic Doppler Current Profiler (ADCP) and promoting the level of marine environmental monitoring, the precision and accuracy of ADCP current measurement have been analyzed in detail based on the current flume with water concentration (0 - 20) kg/m3. The experiments indicated that the precision of ADCP current measurement is enhanced with the uprising of water concentration. The precision of ADCP measurement was significantly influenced by the water concentration when the current was (0.7-0.9) m/s, and it was less affected by the water concentration when the current was 0.3m/s. In addition, with the increase of water concentration, the accuracy of ADCP measurement increased at first and then decreased. The accuracy of current measurement was higher when the concentration was (9-11) kg/m3, and decreased in varying degrees outside this range. When the current was 1.1 m/s, the accuracy of ADCP was greatly affected by the concentration, while it was less affected by the concentration in the case that current is 0.3 m/s. The correlation analysis and conclusion can provide a reference not only for the research and development of ocean observation equipment, but also for marine scientific studies.
Highlights
Acoustic Doppler Current Profiler (ADCP) is a kind of acoustic instrument, which uses acoustic Doppler principle to measure the frequency shift information of scattered signal in layered water medium, and uses vector synthesis method to obtain the velocity of stratified water flow in vertical section[1]
The ADCP is fixed on the current trailer by lifting measuring rod, which can rotate around the axis, so that the indicated direction of the ADCP is in the same direction with the traveling direction of the trailer
Where x is the measured value of the ith current measurement, xis the arithmetic average of n measurements, which is used to evaluate the precision of ADCP current measurement
Summary
Acoustic Doppler Current Profiler (ADCP) is a kind of acoustic instrument, which uses acoustic Doppler principle to measure the frequency shift information of scattered signal in layered water medium, and uses vector synthesis method to obtain the velocity of stratified water flow in vertical section[1]. In practical application, the measurement results of ADCP are greatly affected by environmental factors such as depth, temperature, salinity, concentration, etc., often resulting in the absence or failure of measurement data, which brings great loss of human and financial resources to the marine survey work [7,8,9,10]. The WHS600-I ADCP manufactured by Teledyne RD Instrument in the United States and the Aquadopp Profiler 2MHz ADCP manufactured by Nortek in Norway are selected as the prototype to comprehensively analyze the characteristics of the accuracy and precision of the ADCP current measurements in the water environment with a concentration of (0-20) kg/m3. The analysis and conclusion of this study are of great value to the development and application of ADCP, and of practical significance to the standardization of the detection methods of ADCP parameters, Marine environmental protection and scientific research
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