Surface wave measurements with an acoustic Doppler current profiler (ADCP)

1990 ◽  
Vol 88 (S1) ◽  
pp. S43-S43
Author(s):  
Atle Lohrmann
Keyword(s):  
Surface Wave ◽  
Acoustic Doppler Current Profiler ◽  
Wave Measurements ◽  
Current Profiler

scholarly journals Fine-Scale Velocity Measurement on the Wirewalker Wave-Powered Profiler

2021 ◽  
Author(s):  
Andrew J. Lucas ◽  
Robert Pinkel ◽  
Arnaud Le Boyer
Keyword(s):  
Surface Wave ◽  
Inertial Sensors ◽  
Acoustic Doppler Current Profiler ◽  
Fine Scale ◽  
Platform Motion ◽  
Range Resolution ◽  
Vertical Profiling ◽  
Current Profiler ◽  
Long Endurance ◽  
Vertical Scales

Abstract The Wirewalker (WW) ocean-wave-powered vertical profiling system allows the collection of high-resolution oceanographic data due to its rapid profiling, hydrodynamically quiet operation, and long endurance. We have assessed the potential for measuring fine-scale ocean velocities from the Wirewalker platform using commercially available acoustic velocimeters. Although the vertical profiling speed is relatively steady, platform motion affects the velocity measurements and requires correction. We present an algorithm to correct our velocity estimates using platform motion calculated from the inertial sensors – accelerometer, gyroscope, and magnetometer – on a Nortek Signature1000 Acoustic Doppler Current Profiler. This correction, carried out ping-by-ping, was effective in removing the vehicle motion from the measured velocities. The motion-corrected velocities contain contributions from surface wave orbital velocities, especially near the surface, and the background currents. To proceed, we use an averaging approach that leverages both the vertical platform profiling of the system and the ~15-20 m vertical profiling range resolution of the down-looking ADCP to separate the surface wave orbital velocities and the background flow. The former can provide information on the wave conditions. From the latter, we are able to estimate fine-scale velocity and shear with spectral wavenumber roll-off at vertical scales around 3 m, a vertical resolution several times finer than that possible from modern shipboard or fixed ADCPs with similar profiling range, and similar to recent glider measurements. When combined with a continuous time-series of buoy drift calculated from the onboard GPS, a highly-resolved total velocity field is obtained, with a unique combination of space and time resolution.

Laboratory Study of ADCP Wave Measurements

2002 ◽  
Author(s):  
H. H. Shih ◽  
B. Strong
Keyword(s):  
Technology Development ◽  
Acoustic Doppler Current Profiler ◽  
Cost Effective ◽  
Environmental Data ◽  
Measurement Capability ◽  
Wave Measurements ◽  
Wave Measurement ◽  
Wave Basin ◽  
Current Profiler ◽  
Reference Measurements

The National Ocean Service (NOS) collects real-time environmental data to support mission activities including navigation safety, coastal hazard mitigation, and coastal resource management. Near shore wave information is important for these activities and is of growing interest to marine user groups. Acoustic Doppler current profiler (ADCP) are a primary tool for NOS current measurement programs. Recent technology development has added wave measurement capability to these instruments and provided a convenient way for wave monitoring. However, only limited field comparative studies have been conducted. The need to further understand the performance of these instruments and their operation requirements exists. Tests under controlled laboratory conditions offer certain advantages over field intercomparisons including reduced measurement uncertainties, isolation of variables, and is generally cost effective. This paper describes the study of wave measurement performance of a RDI 1200 KHz ADCP in a wave basin with prescribed waves consist of regular, irregular, and multi-directional waves. The steepness and peak energy frequency for each type of waves, and the orientation of ADCP acoustic beams relative to incident waves were varied. A Linear Array of five ultrasonic sensors and a SonTek 5 MHZ ADVOcean instrument were used to provide reference for intercomparison. The ADCP shows good measurement resolutions and agrees well with the reference measurements.

Klamath River Water Quality and Acoustic Doppler Current Profiler Data from Link River Dam to Keno Dam, 2007

2008 ◽  
Author(s):  
Annett B. Sullivan ◽  
Michael L. Deas ◽  
Jessica Asbill ◽  
Julie D. Kirshtein ◽  
Kenna D. Butler ◽  
...  
Keyword(s):  
Water Quality ◽  
River Water ◽  
Acoustic Doppler Current Profiler ◽  
River Water Quality ◽  
Klamath River ◽  
Current Profiler ◽  
Profiler Data
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