Now showing items 21-40 of 840

  • Acoustic mode coupling by nonlinear internal wave packets in a shelfbreak front area 

    Duda, Timothy F. (IEEE, 2004-01)
    A computational case study of coupled-mode 400-Hz acoustic propagation over the distance 27 km on the continental shelf is presented. The mode coupling reported here is caused by lateral gradients of sound-speed within ...
  • Acoustic mode radiation from the termination of a truncated nonlinear internal gravity wave duct in a shallow ocean area 

    Lin, Ying-Tsong; Duda, Timothy F.; Lynch, James F. (Acoustical Society of America, 2009-10)
    Horizontal ducting of sound between short-wavelength nonlinear internal gravity waves in coastal environments has been reported in many theoretical and experimental studies. Important consequences arising at the open end ...
  • Acoustic multipath arrivals in the horizontal plane due to approaching nonlinear internal waves 

    Badiey, Mohsen; Katsnelson, Boris G.; Lin, Ying-Tsong; Lynch, James F. (Acoustical Society of America, 2011-03-28)
    Simultaneous measurements of acoustic wave transmissions and a nonlinear internal wave packet approaching an along-shelf acoustic path during the Shallow Water 2006 experiment are reported. The incoming internal wave packet ...
  • An acoustic navigation system 

    Hunt, Mary M.; Marquet, William M.; Moller, Donald A.; Peal, Kenneth R.; Smith, Woollcott K.; Spindel, Robert C. (Woods Hole Oceanographic Institution, 1974-12)
    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 ...
  • Acoustic sampling volume 

    Foote, Kenneth G. (Acoustical Society of America, 1991-08)
    Knowledge of the acoustic sampling volume is necessary in many quantitative applications of acoustics. In general, the sampling volume is not merely a characteristic of the transmitting and receiving transducers, but also ...
  • Acoustic scattering by axisymmetric finite-length bodies with application to fish : measurement and modeling 

    Reeder, D. Benjamin (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2002-06)
    This thesis investigates the complexities of acoustic scattering by finite bodies in general and by fish in particular through the development of an advanced acoustic scattering model and detailed laboratory acoustic ...
  • Acoustic scattering by benthic and planktonic shelled animals 

    Stanton, Timothy K.; Chu, Dezhang; Wiebe, Peter H.; Eastwood, Robert L.; Warren, Joseph D. (Acoustical Society of America, 2000-08)
    Acoustic backscattering measurements and associated scattering modeling were recently conducted on a type of benthic shelled animal that has a spiral form of shell (Littorina littorea). Benthic and planktonic shelled animals ...
  • Acoustic scattering from density and sound speed gradients : modeling of oceanic pycnoclines 

    Ross, Tetjana; Lavery, Andone C. (Acoustical Society of America, 2011-12-20)
    A weak-scattering model that allows prediction of acoustic scattering from oceanic pycnoclines (and the accompanying sound speed gradients) based on hydrographic profiles is described. Model predictions, based on profiles ...
  • Acoustic scattering from double-diffusive microstructure 

    Lavery, Andone C.; Ross, Tetjana (Acoustical Society of America, 2007-09)
    Laboratory measurements of high-frequency broadband acoustic backscattering (200–600 kHz) from the diffusive regime of double-diffusive microstructure have been performed. This type of microstructure, which was characterized ...
  • Acoustic scattering from sand dollars (Dendraster excentricus) : modeling as high aspect ratio oblate objects and comparison to experiment 

    Dietzen, Gregory C. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2008-09)
    Benthic shells can contribute greatly to the scattering variability of the ocean bottom, particularly at low grazing angles. Among the effects of shell aggregates are increased scattering strength and potential subcritical ...
  • Acoustic scattering of broadband echolocation signals from prey of Blainville's beaked whales : modeling and analysis 

    Jones, Benjamin A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2006-09)
    Blainville's beaked whales (Mesoplodon densirostris) use broadband, ultrasonic echolocation signals (27 to 57 kHz) to search for, localize, and approach prey that generally consist of mid-water and deep-water fishes and ...
  • Acoustic travel time perturbations due to an internal tide and internal wave field in the Barents Sea 

    Ray, Douglas S. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1993-08)
    Travel time perturbations of adiabatic normal modes due to an internal tide and internal mode field in the Barents Sea are examined. A formalism for the travel time perturbation due to a change in sound speed is presented. ...
  • Acoustical measurement of nonlinear internal waves using the inverted echo sounder 

    Li, Qiang; Farmer, David M.; Duda, Timothy F.; Ramp, Steven R. (American Meteorological Society, 2009-10)
    The performance of pressure sensor–equipped inverted echo sounders for monitoring nonlinear internal waves is examined. The inverted echo sounder measures the round-trip acoustic travel time from the sea floor to the sea ...
  • Acoustics and oceanographic observations collected during the QPE Experiment by Research Vessels OR1, OR2 and OR3 in the East China Sea in the Summer of 2009 

    Newhall, Arthur E.; Lynch, James F.; Gawarkiewicz, Glen G.; Duda, Timothy F.; McPhee, Neil M.; Bahr, Frank B.; Marquette, Craig D.; Lin, Ying-Tsong; Jan, Sen; Wang, Joe; Chen, Chi-Fang; Chiu, Linus Y. S.; Yang, Yiing Jiang; Wei, Ruey-Chang; Emerson, Chris; Morton, David; Abbot, Ted; Abbot, Philip A.; Calder, Brian; Mayer, Larry A.; Lermusiaux, Pierre F. J. (Woods Hole Oceanographic Institution, 2010-08)
    This document describes data, sensors, and other useful information pertaining to the ONR sponsored QPE field program to quantify, predict and exploit uncertainty in observations and prediction of sound propagation. This ...
  • Active methane venting observed at giant pockmarks along the U.S. mid-Atlantic shelf break 

    Newman, Kori R.; Cormier, Marie-Helene; Weissel, Jeffrey K.; Driscoll, Neal W.; Kastner, Miriam; Solomon, Evan A.; Robertson, Gretchen; Hill, Jenna C.; Singh, Hanumant; Camilli, Richard; Eustice, Ryan M. (2007-11)
    Detailed near-bottom investigation of a series of giant, kilometer scale, elongate pockmarks along the edge of the mid-Atlantic continental shelf confirms that methane is actively venting at the site. Dissolved methane ...
  • Adaptive estimation of acoustic normal modes 

    Wage, Kathleen E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1994-09)
    Normal mode theory provides an efficient description of signals which propagate axially in the SOFAR channel and are detectable at long ranges. Mode amplitudes and their second order statistics are useful in studies of ...
  • Adaptive matched field processing in an uncertain propagation environment 

    Preisig, James C. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1992-01)
    Adaptive array processing algorithms have achieved widespread use because they are very effective at rejecting unwanted signals (i.e., controlling sidelobe levels) and in general have very good resolution (i.e., have ...
  • Adaptive sampling in autonomous marine sensor networks 

    Eickstedt, Donald Patrick (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2006-06)
    In this thesis, an innovative architecture for real-time adaptive and cooperative control of autonomous sensor platforms in a marine sensor network is described in the context of the autonomous oceanographic network scenario. ...
  • An adjoint sensitivity study of chlorofluorocarbons in the North Atlantic 

    Li, Xingwen; Wunsch, Carl (American Geophysical Union, 2004-01-03)
    Adjoint sensitivities of CFC-11 concentrations and CFC-11/CFC-12 ratio ages in a North Atlantic general circulation model are analyzed. These sensitivities are compared with those of spiciness, T − (β/α) S, where α, β are ...
  • Advanced Engineering Lab project summaries 1990 

    Frye, Daniel E. (Woods Hole Oceanographic Institution, 1991-05)
    The Advanced Engineerig Laboratory of the Woods Hole Oceanographic Institution is a development laboratory within the Applied Ocean Physics and Engineering Department. Its function is the development of oceanographic ...