WHOI Technical Reports

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https://hdl.handle.net/1912/554

The Woods Hole Oceanographic Institution publishes technical reports describing projects carried out by WHOI researchers. New reports are added as they become available.

Pre-1978 reports are scanned and added by request; contact the WHOAS project manager whoas@whoi.edu to have a Technical Report added.

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Browsing WHOI Technical Reports by Subject "Acoustic Doppler Current Profiler"
  • Technical Report
    ADCP measurements from the ICESHELF 94 experiment
    (Woods Hole Oceanographic Institution, 1995-09) Plueddemann, Albert J. ; Galbraith, Nancy R.
    The ICESHELF 94 Experiment was conducted during April of 1994 from an ice camp in the Lincoln Sea at approximately 84 degrees N, 63 degrees W. An Acoustic Doppler Current Profiler (ADCP) was operated at the camp from 8 to 24 April. This report describes the ADCP configuration and presents the raw data recorded by the ADCP. Processing steps involved in computing horizontal velocities in geographic coordinates from the raw data are described, and time series and spectra of the resulting data are presented. Horizontal velocities with precision of about 1 cm/s were obtained between 27.7 m and 137.0 m depth with 7.8 m resolution. Data were obtained at five minute intervals, but averaged to 1 hr during processing to suppress instrument noise. Spectra show the velocity field to be dominated by variance at semi-siurnal frequency, with a maximum in energy between 50 and 110m depth. Maximum amplitudes of 8 to 10 cm/s were seen near 80 m depth. Velocities from an InterOcean S4 current meter deployed at the same site were compared to those from the ADCP. The largest differences were associated with peaks in the semi-diurnal oscilations, with the S4 underspeeding relative to the ADCP.
  • Technical Report
    A data processing module for acoustic doppler current meters
    (Woods Hole Oceanographic Institution, 1992-01) Plueddemann, Albert J. ; Oien, Andrea L. ; Singer, Robin C. ; Smith, Stephen P.
    This report describes the development of a Data Processing Module (DPM) designed for use with an RD Instruments Acoustic Doppler Current Meter (ADCM). The DPM is a self-powered unit in its own pressure case and its use requires no modification to the current meter. The motivation for this work was the desire for real-time monitoring and data transmission from an ADCM deployed at a remote site. The DPM serves as an interface between the ADCM and a satellite telemetry package consisting of a controller, an Argos Platform Transmit Terminal, and an antenna. The DPM accepts the data stream from the ADCM, processes the data and sends out the processed data upon request from the telemetry controller. The output of the ADCM is processed by eliminating unnecessary data combining quality control information into a small number of summary parameters, and averaging the remaining data in depth and time. For the implementation described here, eight data records of 719 bytes each, output from the ADCM at 15 minute intervals, were processed and averged over 2 hr intervals to produce a 34 byte output array.