DocumentCode :
3388347
Title :
Using a 1200 kHz workhorse ADCP with mode 12 to measure near bottom mean currents
Author :
Martin, Marinna
Author_Institution :
USGS Woods Hole Field Center, MA, USA
fYear :
2003
fDate :
13-15 March 2003
Firstpage :
250
Abstract :
Using high frequency acoustic Doppler current (ADCP) profiling technology, it is possible to make high-resolution measurements of mean current profiles within a few meters of the seabed. In coastal applications, mean current speeds may be 10 cm/s or less, and oscillatory wave currents may exceed 100 cm/s during storm events. To resolve mean flows of 10 cm/s or less under these conditions, accuracies of 1 cm/s or better are desirable. RD Instruments (RDI) has recently added a fast ping mode (mode 12) to their ADCP sampling schemes which may make it possible to achieve 1 cm/s to over 100 cm/s dynamic range with their 1200 kHz ADCP during a 4-month deployment using three standard battery packs. Mode 12 combines fast ping rates with high spatial resolution and high maximum velocities. Mode 12 may be more suitable for these types of high resolution, high velocity measurements than RDI´s existing shallow water modes (5 and 8).
Keywords :
acoustic equipment; ocean waves; oceanographic equipment; oceanographic techniques; seafloor phenomena; seawater; signal sampling; sonar; underwater sound; underwater vehicles; 0.39 m; 0.9 to 6.67 cm/s; 0.99 m; 1.44 cm/s; 10 cm/s; 10 mile; 1200 kHz; 2.8 to 53 cm/s; 20 min; 32 m; AD 2002 02 to 05; Benthic Acoustic Stress Sensor; Boston offshore; acoustic Doppler current profiling technology; bottom mean currents measurements; burst sampling; error velocity measurements; ping rates; power consumption; seabed measurement; seawater; shear waves; signal-noise levels; turbulence; velocity standard deviation; Acoustic measurements; Batteries; Current measurement; Dynamic range; Frequency measurement; Instruments; Sampling methods; Sea measurements; Spatial resolution; Storms;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Current Measurement Technology, 2003. Proceedings of the IEEE/OES Seventh Working Conference on
Print_ISBN :
0-7803-7813-X
Type :
conf
DOI :
10.1109/CCM.2003.1194323
Filename :
1194323
Link To Document :
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