Hunt Mary M.

No Thumbnail Available
Last Name
Hunt
First Name
Mary M.
ORCID

Filters

1974 - 1979 1 1980 - 1988 4
5
Reset filters

Settings

Search Results

Now showing 1 - 5 of 5
  • Technical Report
    Surface-wave data acquisition and dissemination by VHF packet radio and computer networking
    (Woods Hole Oceanographic Institution, 1988-04) Briscoe, Melbourne G. ; Denton, Elsie ; Frye, Daniel E. ; Hunt, Mary M. ; Montgomery, Ellyn T. ; Payne, Richard E.
    Waverider buoy data are normally transmitted on a 27 MHz analog radio link to a shore station a few miles away, where the buoy data are plotted on a paper strip-chart recorder or logged digitally for later computer processing. Instead, we have constructed a relay station on Martha's Vineyard island that retransmits the received Waverider data over a digital, 148 MHz packet-radio link to a personal computer in our laboratory on Cape Cod, where the data are edited, processed, spectrally analyzed, and then sent over an Ethernet line to our Institution mainframe computer for archiving. Telephone modem access of a special wave-data file on the mainframe permits unattended data dissemination to the public. The report describes the entire system, including Waverider buoy mooring hardware, computer programs, and equipment. The purpose of the project was to learn what difficulties are involved in the automated acquisition and dissemination of telemetered oceanographic data, and to gain experience with packet radio techniques. Although secondary to these purposes, the long-term surface-wave monitoring off the southwest shore of Martha's Vineyard has its own scientific, engineering, and environmental benefits.
  • Technical Report
    An acoustic navigation system
    (Woods Hole Oceanographic Institution, 1974-12) Hunt, Mary M. ; Marquet, William M. ; Moller, Donald A. ; Peal, Kenneth R. ; Smith, Woollcott K. ; Spindel, Robert C.
    This report describes a system for underwater acoustic navigation developed, and in use, at the Woods Hole Oceanographic Institution. It includes a brief discussion of the electronic components, operation, mathematical analysis, and available computer programs. There is a series of supplementary Technical Memoranda containing more information on various aspects of the system. We believe that this kind of documentation is more flexible and better meets the needs of potential users than including all technical details in one large volume. These are not final or definitive reports; acoustic navigation capabilities will continue to evolve at W.H.O.I. for some time. Acoustic navigation provides a method of tracking a ship, and an underwater vehicle or instrument package (‘fish’), in the deep ocean. Acoustic devices attached to the ship and fish measure the length of time it takes a sound pulse to travel to acoustic transponders moored on the ocean floor. If the transponder positions and the average speed of sound are known, the ship or fish position can be found.
  • Working Paper
    A user’s manual for finite difference synthetic seismogram codes on the CYBER 205 and CRAY XMP-12
    (Woods Hole Oceanographic Institution, 1986-11) Hunt, Mary M. ; Stephen, Ralph A.
    Over the past eight years, a software package has been developed to solve the elastic wave equation by the method of finite differences (Hunt et al., 1983; Stephen, 1983; Stephen, 1984a; Stephen, 1984b; Nicoletis, 1981). The elastic wave equation can be solved in two dimensions for point sources in cylindrical coordinates or line sources in rectangular coordinates. Compressional and shear velocity and density are allowed to vary both vertically and radially. Since the code is very computationally intensive for realistic size models, it has been implemented on two Class VI super computers: the Cyber 205 at Purdue University and the Cray XMP-l2 at the Naval Research Laboratory. This technical report is a user's manual for running the code on these machines. It is assumed that the reader is already familiar with running the code on the VAX ll-780 (Hunt et al., 1983).
  • Technical Report
    FINDIF : a software package to create synthetic seismograms by finite differences
    (Woods Hole Oceanographic Institution, 1983-11) Hunt, Mary M. ; Gove, Lee ; Stephen, Ralph A.
    In order to study seismic wave propagation through laterally varying sea floor structures, a software package has been created to generate synthetic seismograms by finite differences. The elastic wave equation can be solved in two dimensions either for point sources in cylindrical coordinates or for line sources in rectangular coordinates. Vertical and radial variations of the elastic parameters are allowed. The package includes four programs. Input to the system consists of a short file containing parameter values to describe the model. The first program is used to initialize the system for the particular model being used. The source arrays and velocity matrices are each computed by a separate program. The final program, which actually carries out the finite difference calculations, includes six subroutines to implement different options based on alternative finite difference formulations. Two different kinds of output files are created by this program: one or more snap-shot files, and one time series file, which will usually include more than one series.
  • Technical Report
    A database for zooplankton net tow data
    (Woods Hole Oceanographic Institution, 1980-06) Hunt, Mary M. ; Wiebe, Peter
    This report describes the design and implementation of a database to store zooplankton net tow data and the applications programming done to update and access the database using the Sigma 7 Extended Database Management System. The database contains information about each tow (cruise name, tow number, type of tow, year, month, day, time of day, longitude, latitude, area of tow, day-night code); each sample (depth code; minimum and maximum depth; minimum, maximum and average values of temperature, salinity, oxygen, light and chlorophyll; total biomass; aliquot size; and volume of water filtered); each species (family, genus, species names, and catch per 1000 m3). Information can be retrieved by user-written applications programs or with the Sigma 7 Interactive Database Processor, which can either print a report of the retrieved data or store it in a file for further processing. As presently formulated, the database can store up to 500 tows or samples, 10 families, 100 genera, 500 species and 50,000 catch records.