| Comparative Modeling and Analysis of Wideband Low Frequency Acoustic Propagation in the Shallow Water Environment |
15 JUL 2002 |
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| Authors:
James C. Preisig; Timothy F. Duda; George V. Frisk; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA DEPT OF APPLIED OCEAN PHYSICS AND ENGINEERING
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 | This grant was supported by the Ocean Acoustics Program in the Sensors and Systems Division of the Ocean, Atmosphere and Space Department of ONR. This project was a direct follow-on, scientifically speaking, of research performed under Grant N00014-95-1-0029, 'Analytical and numerical study of shallow-water acoustic mode coupling from solitary internal waves'. Modeling was done at frequencies of 50 to 2400 Hz in order to determine acoustic mode coupling behavior in ... |
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| Shearmeter Floats in the Area of the WHOI Brazil Basin Tracer Release Experiment: Technical and Oceanographic Data |
JAN 2002 |
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| Authors:
Timothy F. Duda; Brian J. Guest; Christine M. Wooding; Clayton M. Jones; Scott Lelievre; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
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| Six drifting floats designed to measure shear were deployed in the vicinity of the Brazil Basin Tracer Release Experiment. The one-year long time series of oceanographic conditions obtained by the floats are for direct comparison with long-term tracer dispersion. The purpose of the tracer dispersion experiment was to study mixing of Antarctic Bottom Water at approximately 4000 m depth with less dense water above. Two of the floats returned shear ... |
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| October 1998 Internal Solitary Wave Workshop Organization and Coastal Mixing Coastal and Optics Web Site Coordination |
20 JUL 2000 |
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| Authors:
James R. Ledwell; Timothy F. Duda; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA DEPT OF APPLIED OCEAN PHYSICS AND ENGINEERING
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| This grant was supported by the Physical Oceanography Program in the Processes and Prediction Division of the Ocean, Atmosphere and Space Department of ONR. The funds defrayed expenses for two activities related to our research into mixing in the coastal ocean. One was the organization of an international meeting of researchers studying nonlinear internal gravity waves throughout the world's oceans. The other was the building ... |
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| Tracer Studies of Mixing in Stratified Coastal Waters |
25 MAY 2000 |
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| Authors:
James R. Ledwell; Timothy F. Duda; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA DEPT OF APPLIED OCEAN PHYSICS AND ENGINEERING
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| This grant was supported by the Physical Oceanography Program in the Processes and Prediction Division of the Ocean, Atmosphere and Space Department of ONR. The objectives were to inject dye plumes in the coastal ocean as part of the multi-PI Coastal Mixing and Optics Experiment (CMO) south of New England and observe the dye dispersal in a quantitative manner, and to measure micro-scale temperature fluctuations from a ... |
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| The 1998 WHOI/IOS/ONR Internal Solitary Wave Workshop: Contributed Papers |
JUL 1999 |
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| Authors:
Timothy F. Duda; David M. Farmer; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
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| A workshop entitled internal Solitary Waves in The Ocean: Their Physics and implications for Acoustics, Biology, and Geology was held during October, 1998 in Sidney, British Columbia, Canada. It was jointly organized by the Woods Hole Oceanographic Institution (MA, USA), the Institute of Ocean Sciences (Sidney, BC, Canada), and the U.S. Office of Naval Research. More than 60 scientists from seven countries attended. Participants contributed papers prior to the meeting ... |
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| Graduate Research Training in Coastal Oceanography and Mixing |
18 MAR 1999 |
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| Authors:
Timothy F. Duda; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA DEPT OF APPLIED OCEAN PHYSICS AND ENGINEERING
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| This AASERT program award was used to partially fund the graduate education of Miles Sundermeyer in the MIT/WHOI Joint Program in Oceanography. It was also used to fund research performed by him while he was a student. Miles earned the PhD. degree in September, 1998. The topic of his research was lateral dispersion of substances in the ocean. The research in the second part of the two-part ... |
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| Ocean Acoustical Ray-Tracing Software RAY |
OCT 92 |
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| Authors:
James B. Bowlin; John L. Spiesberger; Timothy F. Duda; Lee F. Freitag; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
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| A new computer program for accurate calculation of acoustic ray paths through a range-varying ocean sound channel has been written. It is based on creating a model of the speed of sound in the ocean, consistent with input data, that produces the smoothest possible wavefronts. This scheme eliminates false caustics from the wavefront. It may be useful in calculating an approximate solution to the full wave equation at megameter ranges.... ... |
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| Smoothly Modulated Frequency-Bounded Impulse Signals for Tomography |
JUN 91 |
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| Authors:
Timothy F. Duda; James F. Lynch; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
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| A group of amplitude and frequency modulated signals which generate narrow synthesized pulses and which also have smoothly varying phase are described. The frequency-sweep (chirp) signals have exactly-defined frequency content and differentiable phase. These signals can be used with efficient resonant transducers, if the resonant frequency is adjustable, and they have adequate Doppler response for use with drifting apparatus. |
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