Calibration of acoustic Doppler current profiles

Appell, G.; Gast, J.; Williams, Robert G.; Bass, Polly

doi:10.1109/oceans.1988.23526

Cited by 11 publications

(2 citation statements)

References 3 publications

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“…Many investigators have compared ADCP velocity measurements to measurements made simultaneously or nearly simultaneously with other well-calibrated instruments. Comparisons of ADCPmeasured velocities to tow-cart velocities by Shih et al ͑2000͒ andAppell et al ͑1988͒, showed that the ADCPs performed at or close to the manufacturer's specifications. Nystrom et al ͑2002͒ showed that mean velocities measured by commercially available ADCP measurements were within ±1 cm/ s of acoustic Doppler velocimeter ͑ADV͒ measured velocities.…”

Section: Previous Workmentioning

confidence: 77%

Validation of Streamflow Measurements Made with Acoustic Doppler Current Profilers

2007

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The U.S. Geological Survey and other international agencies have collaborated to conduct laboratory and field validations of acoustic Doppler current profiler ͑ADCP͒ measurements of streamflow. Laboratory validations made in a large towing basin show that the mean differences between tow cart velocity and ADCP bottom-track and water-track velocities were −0.51 and −1.10%, respectively. Field validations of commercially available ADCPs were conducted by comparing streamflow measurements made with ADCPs to reference streamflow measurements obtained from concurrent mechanical current-meter measurements, stable rating curves, salt-dilution measurements, or acoustic velocity meters. Data from 1,032 transects, comprising 100 discharge measurements, were analyzed from 22 sites in the United States, Canada, Sweden, and The Netherlands. Results of these analyses show that broadband ADCP streamflow measurements are unbiased when compared to the reference discharges regardless of the water mode used for making the measurement. Measurement duration is more important than the number of transects for reducing the uncertainty of the ADCP streamflow measurement.

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Section: Previous Workmentioning

confidence: 77%

Validation of Streamflow Measurements Made with Acoustic Doppler Current Profilers

2007

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“…Additionally, the potential accuracy and precision of the ADCP is greater than many mechanical measuring devices. Evaluation of ADCPs in tow tank environments has provided much useful information, particularly with respect to beam calibration [4]. However, two important aspects of performance that cannot be easily tested in a tow tank are measurements at far vertical range and in a vertically sheared current.…”

Section: Introductionmentioning

confidence: 99%

A Model Approach To Predicting Errors In Acoustic Dopler Current Profiles

Chereskin

Harding²

OCEANS 92 Proceedings@m_Mastering the Oceans Through Technology

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A modeling approach is applied to predicting errors in velocity estimates made by pulse to pulse incoherent acoustic Doppler current profilers (ADCPs). A system model is described that provides a direct simulation of ADCP signal processing, including a tracking feedback loop, sometimes referred to as a frequency tracker. Although the model follows general principles of incoherent sonar signal processing (autocovariance estimation of the Doppler shift frequency) and phaselocked loops, we present model predictions for a particular system, an RD Instruments 153.6 kHz ADCP, a system in widespread use on oceanographic research vessels and current meter moorings. Model validation is achieved by comparison with ADCP measurements of the same signals, coupled into the ADCP using a signal simulator.By assuming a statistical model of the backscatter, the model can be used to predict errors in velocity estimates determined by Janus beam pairs, measuring a velocity shear in a medium of randomly distributed scatterers. In addition to error prediction, the model is used to explore the dependence between velocity errors and system parameters, with an emphasis on optimizing those parameters that are accessible to users of commercial instruments.

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Vertical Profiling of Currents Using Acoustic Doppler Current Profilers

Joseph

2014

Measuring Ocean Currents

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Calibration of acoustic Doppler current profiles

Cited by 11 publications

References 3 publications

Validation of Streamflow Measurements Made with Acoustic Doppler Current Profilers

Validation of Streamflow Measurements Made with Acoustic Doppler Current Profilers

A Model Approach To Predicting Errors In Acoustic Dopler Current Profiles

Vertical Profiling of Currents Using Acoustic Doppler Current Profilers

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