Now showing items 243-262 of 904

    • Discriminating between the nearfield and the farfield of acoustic transducers 

      Foote, Kenneth G. (Acoustical Society of America, 2014-10)
      Measurements of the performance of acoustic transducers, as well as ordinary measurements made with the same, may require discriminating between the farfield, where the field is spherically divergent, and the complementary ...
    • The dispersal of dense water formed in an idealized coastal polynya on a shallow sloping shelf 

      Zhang, Weifeng G.; Cenedese, Claudia (American Meteorological Society, 2014-06)
      This study examines the dispersal of dense water formed in an idealized coastal polynya on a sloping shelf in the absence of ambient circulation and stratification. Both numerical and laboratory experiments reveal two ...
    • Dispersion of a tracer in the deep Gulf of Mexico 

      Ledwell, James R.; He, Ruoying; Xue, Zuo; DiMarco, Steven; Spencer, Laura J.; Chapman, Piers (John Wiley & Sons, 2016-02-05)
      A 25 km streak of CF3SF5 was released on an isopycnal surface approximately 1100 m deep, and 150 m above the bottom, along the continental slope of the northern Gulf of Mexico, to study stirring and mixing of a passive ...
    • Dispersion of fine particles by wave-induced mass transport near a circular island 

      Womeldorf, Carole A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1993-08)
      We begin with the linearized irrotational theory describing the diffraction of an incoming plane wave by a vertical cylinder. From the free-surface motion, we describe the boundary-layer flow field U0i near that cylinder. ...
    • Dissolved methane distributions and air-sea flux in the plume of a massive seep field, Coal Oil Point, California 

      Mau, Susan; Valentine, David L.; Clark, Jordan F.; Reed, Justin; Camilli, Richard; Washburn, Libe (American Geophysical Union, 2007-11-24)
      Large quantities of natural gas are emitted from the seafloor into the stratified coastal ocean near Coal Oil Point, Santa Barbara Channel, California. Methane was quantified in the down current surface water at 79 stations ...
    • A distributed approach to underwater acoustic communications 

      Bohner, Christopher George (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2003-09)
      A novel distributed underwater acoustic networking (UAN) protocol suitable for ad-hoc deployments of both stationary and mobile nodes dispersed across a relatively wide coverage area is presented. Nodes are dynamically ...
    • Distributed autonomy and formation control of a drifting swarm of autonomous underwater vehicles 

      Rypkema, Nicholas R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2015-09)
      Recent advances in autonomous underwater vehicle (AUV) technology have led to their wide-spread acceptance and adoption for use in scientific, commercial, and defence applications in the underwater domain. At the same time, ...
    • Distributed space–time cooperative schemes for underwater acoustic communications 

      Vajapeyam, Madhavan; Vedantam, Satish; Mitra, Urbashi; Preisig, James C.; Stojanovic, Milica (IEEE, 2008-10)
      In resource limited, large scale underwater sensor networks, cooperative communication over multiple hops offers opportunities to save power. Intermediate nodes between source and destination act as cooperative relays. ...
    • The distribution of wave heights and periods for seas with unimodal and bimodal power density spectra 

      Sharpe, Matthew M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1990-09)
      Observed distributions of wave heights and periods taken from one year of surface wave monitoring near Martha's Vineyard are compared to distributions based on narrow-band theory. The joint distributions of wave heights ...
    • Diurnal and semidiurnal internal tide energy flux at a continental slope in the South China Sea 

      Duda, Timothy F.; Rainville, Luc (American Geophysical Union, 2008-03-25)
      Barotropic (surface) and baroclinic (internal) tides were measured at four mooring sites during a field investigation of acoustic propagation characteristics and physical oceanography in the northern South China Sea. The ...
    • Diverse styles of submarine venting on the ultraslow spreading Mid-Cayman Rise 

      German, Christopher R.; Bowen, Andrew D.; Coleman, M. L.; Honig, D. L.; Huber, Julie A.; Jakuba, Michael V.; Kinsey, James C.; Kurz, Mark D.; Leroy, S.; McDermott, Jill M.; Mercier de Lepinay, B.; Nakamura, Ko-ichi; Seewald, Jeffrey S.; Smith, J. L.; Sylva, Sean P.; Van Dover, Cindy L.; Whitcomb, Louis L.; Yoerger, Dana R. (2010-06-24)
      Thirty years after the first discovery of high-temperature submarine venting, the vast majority of the global Mid Ocean Ridge remains unexplored for hydrothermal activity. Of particular interest are the world’s ultra-slow ...
    • Do Trichodesmium spp. populations in the North Atlantic export most of the nitrogen they fix? 

      McGillicuddy, Dennis J. (John Wiley & Sons, 2014-02-20)
      A new observational synthesis of diazotrophic biomass and nitrogen fixation provides the opportunity for systematic quantitative evaluation of these aspects in biogeochemical models. One such model of the Atlantic Ocean ...
    • Dominant run-length method for image classification 

      Tang, Xiaoou (Woods Hole Oceanographic Institution, 1997-06)
      In this paper, we develop a new run-length texture feature extraction algorithm that significantly improves image classification accuracy over traditional techniques. By directly using part or all of the run-length matrix ...
    • Drag coefficients of vibrating synthetic rope 

      Charnews, Daniel Paul (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1971-09)
      The drag, amplitude, frequency tension, diameter and length of synthetic ropes vibrating because of vortex-induced forces, and net vibrating at different tensions were measured. Photographs were taken of the vortices. Drag ...
    • Drift and mixing under the ocean surface : a coherent one-dimensional description with application to unstratified conditions 

      Rascle, Nicolas; Ardhuin, Fabrice; Terray, Eugene A. (American Geophysical Union, 2006-03-24)
      Waves have many effects on near-surface dynamics: Breaking waves enhance mixing, waves are associated with a Lagrangian mean drift (the Stokes drift), waves act on the mean flow by creating Langmuir circulations and a ...
    • A dual sensor device to estimate fluid flow velocity at diffuse hydrothermal vents 

      Sarrazin, J.; Rodier, P.; Tivey, Margaret K.; Singh, Hanumant; Schultz, A.; Sarradin, Pierre-Marie (2009-06-12)
      Numerous attempts have been made over the last thirty years to estimate fluid flow rates at hydrothermal vents, either at the exit of black smoker chimneys or within diffuse flow areas. In this study, we combine two ...
    • Dynamic analysis of a launch and recovery system for a deep submersible 

      Vandiver, J. Kim (Woods Hole Oceanographic Institution, 1969-12)
      An analysis of the motion of a docking platform for a deep submersible is presented. The problem is defined as a docking platform, or cradle, suspended beneath a surface vessel by elastic elements, composed of cable, ...
    • The dynamics of geometrically compliant mooring systems 

      Gobat, Jason I. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2000-06)
      Geometrically compliant mooring systems that change their shape to accommodate deformations are common in oceanographic and offshore energy production applications. Because of the inherent geometric nonlinearities, ...
    • Dynamics of the direct intrusion of Gulf Stream ring water onto the Mid-Atlantic Bight shelf 

      Zhang, Weifeng G.; Gawarkiewicz, Glen G. (John Wiley & Sons, 2015-09-30)
      Onshore intrusions of offshore waters onto the Mid-Atlantic Bight shelf can greatly affect shelf circulation, biogeochemistry, and fisheries. Previous studies have concentrated on onshore intrusions of slope water. Here ...
    • Echo statistics of individual and aggregations of scatterers in the water column of a random, oceanic waveguide 

      Jones, Benjamin A.; Colosi, John A.; Stanton, Timothy K. (Acoustical Society of America, 2014-07)
      The relative contributions of various physical factors to producing non-Rayleigh distributions of echo magnitudes in a waveguide are examined. Factors that are considered include (1) a stochastic, range-dependent sound-speed ...