Now showing items 249-268 of 840

  • 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 ...
  • Echolocation clicks of free-ranging Cuvier's beaked whales (Ziphius cavirostris) 

    Zimmer, Walter M. X.; Johnson, Mark P.; Madsen, Peter T.; Tyack, Peter L. (Acoustical Society of America, 2005-06)
    Strandings of beaked whales of the genera Ziphius and Mesoplodon have been reported to occur in conjunction with naval sonar use. Detection of the sounds from these elusive whales could reduce the risk of exposure, but ...
  • Eddy-driven pulses of respiration in the Sargasso Sea 

    Mourino-Carballido, Beatriz (2009-02)
    An analysis of nine years of data from the NW subtropical Atlantic reveals that variability in heterotrophic processes associated with (sub)mesoscale features has a major impact on the balance between photosynthesis and ...
  • The effect of internal waves on long range acoustic propagation in the ocean 

    Jaffee, Richard Jay (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1976-05)
    The acoustic-internal wave interaction in an acoustic waveguide is investigated using wave techniques. Refractive index fluctuations due to the vertical displacements of the internal waves create an inhomogeneous ...
  • The effect of wave breaking on surf-zone turbulence and alongshore currents : a modeling study 

    Feddersen, Falk; Trowbridge, John H. (American Meteorological Society, 2005-11)
    The effect of breaking-wave-generated turbulence on the mean circulation, turbulence, and bottom stress in the surf zone is poorly understood. A one-dimensional vertical coupled turbulence (k–ε) and mean-flow model is ...
  • Effects of estuarine and fluvial processes on sediment transport over deltaic tidal flats 

    Ralston, David K.; Geyer, W. Rockwell; Traykovski, Peter A.; Nidzieko, Nicholas J. (2012-01-25)
    Tidal flats at a river mouth feature estuarine and fluvial processes that distinguish them from tidal flats without river discharge. We combine field observations and a numerical model to investigate hydrodynamics and ...
  • Effects of internal waves on low frequency, long range, acoustic propagation in the deep ocean 

    Xu, Jinshan (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2007-09)
    This thesis covers a comprehensive analysis of long-range, deep-ocean, low-frequency, sound propagation experimental results obtained from the North Pacific Ocean. The statistics of acoustic fields after propagation ...
  • Effects of wave rollers and bottom stress on wave setup 

    Apotsos, Alex; Raubenheimer, Britt; Elgar, Steve; Guza, R. T.; Smith, Jerry A. (American Geophysical Union, 2007-02-03)
    Setup, the increase in the mean water level associated with breaking waves, observed between the shoreline and about 6-m water depth on an ocean beach is predicted well by a model that includes the effects of wave rollers ...
  • Effects of wave shape on sheet flow sediment transport 

    Hsu, Tian-Jian; Hanes, Daniel M. (American Geophysical Union, 2004-05-25)
    A two-phase model is implemented to study the effects of wave shape on the transport of coarse-grained sediment in the sheet flow regime. The model is based on balance equations for the average mass, momentum, and fluctuation ...
  • Efficient control based on a verified model for an autonomous underwater vehicle : a case study of Autonomous Benthic Explorer 

    Anderson, Jamie M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1992-02)
    The Autonomous Benthic Explorer (ABE) is an unmanned underwater vehicle being developed for scientific study of the deep ocean sea:floor. ABE will be completely autonomous from the surface which means that the lifetime ...
  • Effusive and explosive volcanism on the ultraslow-spreading Gakkel Ridge, 85°E 

    Pontbriand, Claire W.; Soule, Samuel A.; Sohn, Robert A.; Humphris, Susan E.; Kunz, Clayton G.; Singh, Hanumant; Nakamura, Ko-ichi; Jakobsson, Martin; Shank, Timothy M. (American Geophysical Union, 2012-10-06)
    We use high-definition seafloor digital imagery and multibeam bathymetric data acquired during the 2007 Arctic Gakkel Vents Expedition (AGAVE) to evaluate the volcanic characteristics of the 85°E segment of the ultraslow ...
  • Ekman veering, internal waves, and turbulence observed under Arctic sea ice 

    Cole, Sylvia T.; Timmermans, Mary-Louise; Toole, John M.; Krishfield, Richard A.; Thwaites, Fredrik T. (American Meteorological Society, 2014-05)
    The ice–ocean system is investigated on inertial to monthly time scales using winter 2009–10 observations from the first ice-tethered profiler (ITP) equipped with a velocity sensor (ITP-V). Fluctuations in surface winds, ...
  • Electrical structure beneath the northern MELT line on the East Pacific Rise at 15°45′S 

    Baba, Kiyoshi; Tarits, Pascal; Chave, Alan D.; Evans, Rob L.; Hirth, Greg; Mackie, Randall L. (American Geophysical Union, 2006-11-16)
    The electrical structure of the upper mantle beneath the East Pacific Rise (EPR) at 15°45′S is imaged by inverting seafloor magnetotelluric data obtained during the Mantle ELectromagnetic and Tomography (MELT) experiment. ...
  • Electromagnetic constraints on a melt region beneath the central Mariana back-arc spreading ridge 

    Matsuno, Tetsuo; Evans, Rob L.; Seama, Nobukazu; Chave, Alan D. (American Geophysical Union, 2012-10-25)
    An electrical resistivity profile across the central Mariana subduction system shows high resistivity in the upper mantle beneath the back-arc spreading ridge where melt might be expected to exist. Although seismic data ...
  • Electromagnetic image of the Trans-Hudson orogen — THO94 transect 

    Garcia, Xavier; Jones, Alan G. (National Research Council Canada, 2005-06-01)
    The North American Central Plains (NACP) anomaly in enhanced electric conductivity and its relationship with the Paleoproterozoic Trans-Hudson orogen (THO) has been studied under the auspices of Lithoprobe for over a decade. ...
  • Electronic still camera processing and mosaicking 

    Howland, Jonathan C.; Lerner, Steven A. (Woods Hole Oceanographic Institution, 1999-12-23)
    Since 1990, the Deep Submergence Laboratory and Deep Submergence Group of the Woods Hole Oceanographic Institution have been collecting large quantities of digital imagery and creating digital photomosaics of the sea ...
  • Elevators - autonomous transporters for deep sea benthic sample recovery 

    Bowen, Martin F.; Bernard, P. J.; Gleason, D. E.; Whitcomb, Louis L. (Woods Hole Oceanographic Institution, 2000-01)
    Two classes of sample recovery devices have been fabricated for use with the Jason deep diving remotely operated vehicle (ROV). One class includes custom-built, autonomous vertical transporters (AVTs) that are capable of ...
  • Emulating the fast-start swimming performance of the chain pickerel (Esox niger) using a mechanical fish design 

    Watts, Matthew Nicholas (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2006-09)
    Mean maximum start-up accelerations and velocities achieved by the fast-start specialist, northern pike, are reported at 120 ms-2 and 4 ms-1, respectively (Harper and Blake, 1990). In this thesis, a simple mechanical system ...
  • Enhanced acoustic mode coupling resulting from an internal solitary wave approaching the shelfbreak in the South China Sea 

    Chiu, Linus Y. S.; Reeder, D. Benjamin; Chang, Yuan-Ying; Chen, Chi-Fang; Chiu, Ching-Sang; Lynch, James F. (Acoustical Society of America, 2013-03)
    Internal waves and bathymetric variation create time- and space-dependent alterations in the ocean acoustic waveguide, and cause subsequent coupling of acoustic energy between propagating normal modes. In this paper, the ...
  • Enhancement of fine particle deposition to permeable sediments 

    Fries, Jerry Stephen (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2002-02)
    Predictions of deposition rate are integral to the transport of many constituents including contaminants, organic matter, and larvae. Review of the literature demonstrates a general appreciation for the potential control ...