Dunn Christopher V. R.

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Christopher V. R.

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  • Technical Report
    Satellite data processing system (SDPS) users manual V1.0
    (Woods Hole Oceanographic Institution, 1989-05) Caruso, Michael J. ; Dunn, Christopher V. R.
    SDPS is a menu driven interactive program designed to facilitate the display and output of image and line-based data sets common to telemetry, modeling and remote sensing. This program can be used to display up to four separate raster images and overlay line-based data such as coastlines, ship tracks and velocity vectors. The program uses multiple windows to communicate information with the user. At any given time, the program may have up to four image display windows as well as auxiliary windows containing information about each image displayed. SDPS is not a commercial program. It does not contain complete type checking or error diagnostics which may allow the program to crash. Known anomalies will be mentioned in the appropriate section as notes or cautions.
  • Technical Report
    Report on Sediment Transport Events on Shelf and Slope (STRESS) field season 1 : Winter 1988-1989 Benthic Acoustic Stress Sensor (BASS)
    (Woods Hole Oceanographic Institution, 1989-12) Montgomery, Ellyn T. ; Dunn, Christopher V. R. ; Williams, Albert J.
    Data on the effects of winter conditions on the transport of sediment on the continental shelf off Northern California were collected during the flrst year of the Sediment TRansport Events on Shelf and Slope (STRESS) Experiment. This experiment was done in conjunction with (Shelf Mixed Layer Experiment) SMILE and (Biological Effects on Coastal Ocean Sediment Transport) BECOST to provide a complete suite of measurements of nearshore dynamics, sediment transport, and biological interactions. This report includes a general description of the work accomplished during the frrst STRESS fleld season, carried out in the winter of 1988-1989 off the Northern California coast Three cruises were completed during the STRESS experiment, one each for deployment, turnaround, and r~overy of the instruments. This created two back-to-back sections of data, one from December 4, 1988 to January 23, 1989, and the other from January 29 to March 17, 1989. This report also documents in detail the use of the Benthic Acoustic Stress Sensor (BASS), and the associated acoustic data telemetry link in STRESS. BASS has been used in different configurations previously, but the acoustic telemetry system is new.
  • Technical Report
    A pop-up float recovery system for coastal oceanographic tripods
    (Woods Hole Oceanographic Institution, 1989-11) Dunn, Christopher V. R. ; Gordon, Allan G.
    The recovery package described here was used as the primary retrieval system to recover tripod instrument platforms from a depth of 90 meters. The device uses dual in-line burn wires, one of which is acoustically commanded from the surface ship. The other is set to release by back-up timer, ensuring recovery in the event of a poor acoustic command channel. The burn wire activates spring loaded cam latches which release the float package and pull a ~ inch Dacron line to the surface. The float package is recovered and the line is used to winch the tripod to the surface for recovery by the ship's crane. Major benefits of the system are reliability, low cost, light weight, and use of many off-the-shelf components. The float package provides 50 pounds of buoyancy and is fabricated using commercial fish trawl net floats. The retrieval line container is separate from the float assembly, and is fabricated from plastic storage containers. The line is coiled and restricted to prevent unpackaging due to waves or current action. The system described here is not appropriate in areas of high current or great depth due to drag and dead weight of the lift line.
  • Technical Report
    A miniature urethane molded acoustic transducer
    (Woods Hole Oceanographic Institution, 1984-08) Dunn, Christopher V. R.
    The development of a reliable miniature molded transducer for the Williams/Koehler acoustic current meter, BASS (Benthic Acoustic Stress Sensor) ls documented. The procedures developed and components selected for manufacturing the transducer assemblies are documented as well as some of those rejected. Engineering tests performed to ensure reliable performance in the field are outlined and discussed as well. The transducers are now routinely molded with great success (over 1200 operational transducer months to date) and commercial sources are being investigated.