Now showing items 283-302 of 854

  • Estimation and correction of geometric distortions in side-scan sonar images 

    Cobra, Daniel Távora de Queiroz (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1990-03)
    This thesis introduces a new procedure for the enhancement of acoustic images of the bottom of the sea produced by side-scan sonars. Specifically, it addresses the problem of estimating and correcting geometric distortions ...
  • Estimation and tracking of rapidly time-varying broadband acoustic communication channels 

    Li, Weichang (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2006-02)
    This thesis develops methods for estimating wideband shallow-water acoustic communication channels. The very shallow water wideband channel has three distinct features: large dimension caused by extensive delay spread; ...
  • Estimation of planetary wave parameters from the data of the 1981 ocean acoustic tomography experiment 

    Chiu, Ching-Sang (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1985-08)
    Using the maximum-likelihood estimation method and minimization techniques, quasi-geostrophic wave solutions were fitted to the observations of the 1981 Ocean Acoustic Tomography Experiment. The experiment occupied a ...
  • Estimation of sea surface wave spectra using acoustic tomography 

    Miller, James H. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1987-08)
    This thesis develops a new technique for estimating quasi-homogeneous and quasi-stationary sea surface wave frequency-direction spectra using acoustic tomography. The analysis of acoustic (mode and ray) phase and travel ...
  • Estuarine boundary layer mixing processes : insights from dye experiments 

    Chant, Robert J.; Geyer, W. Rockwell; Houghton, Robert; Hunter, Elias; Lerczak, James A. (American Meteorological Society, 2007-07)
    A series of dye releases in the Hudson River estuary elucidated diapycnal mixing rates and temporal variability over tidal and fortnightly time scales. Dye was injected in the bottom boundary layer for each of four releases ...
  • Estuarine exchange flow quantified with isohaline coordinates : contrasting long and short estuaries 

    Chen, Shih-Nan; Geyer, W. Rockwell; Ralston, David K.; Lerczak, James A. (American Meteorological Society, 2012-05)
    Isohaline coordinate analysis is used to compare the exchange flow in two contrasting estuaries, the long (with respect to tidal excursion) Hudson River and the short Merrimack River, using validated numerical models. The ...
  • Estuarine frontogenesis 

    Geyer, W. Rockwell; Ralston, David K. (American Meteorological Society, 2015-02)
    Model studies and observations in the Hudson River estuary indicate that frontogenesis occurs as a result of topographic forcing. Bottom fronts form just downstream of lateral constrictions, where the width of the estuary ...
  • Evaluation of electromagnetic source for ocean climate acoustic thermometry at Lake Seneca 

    Slavinsky, Mark; Bogolubov, Boris; Alelekov, Igor; Pigalov, Konstantin; Spiesberger, John L.; Boutin, Paul (Woods Hole Oceanographic Institution, 1993-02)
    A compact electromagnetic monopole source, requiring pressure equalization, was evaluated at the Naval Underwater Systems Center at Lake Seneca during July 1992 by scientists from the Institute of Applied Physics of the ...
  • Evaluation of the National Oceanic and Atmospheric Administration/Coupled-Ocean Atmospheric Response Experiment (NOAA/COARE) air-sea gas transfer parameterization using GasEx data 

    Hare, Jeffrey E.; Fairall, Christopher W.; McGillis, Wade R.; Edson, James B.; Ward, Brian; Wanninkhof, Rik (American Geophysical Union, 2004-07-16)
    During the two recent GasEx field experiments, direct covariance measurements of air-sea carbon dioxide fluxes were obtained over the open ocean. Concurrently, the National Oceanic and Atmospheric Administration/Coupled-Ocean ...
  • Evaluation of transport relative to the tidal mixing front on southern Georges Bank 

    Katrein, Jody M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2001-09)
    As part of Phase III of the U.S. GLOBEC Georges Bank program, drogued drifters and dye tracer were released into the pycnocline on the southern flank of Georges Bank to measure advective and diffusive transport relative ...
  • Evaluation of vector sensors for adaptive equalization in underwater acoustic communication 

    Lewis, Matthew R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2014-09)
    Underwater acoustic communication is an extremely complex field that faces many challenges due to the time-varying nature of the ocean environment. Vector sensors are a proven technology that when utilizing their directional ...
  • Evidence for hydrogen oxidation and metabolic plasticity in widespread deep-sea sulfur-oxidizing bacteria 

    Anantharaman, Karthik; Breier, John A.; Sheik, Cody S.; Dick, Gregory J. (2012-11-08)
    Hydrothermal vents are a well-known source of energy that powers chemosynthesis in the deep sea. Recent work suggests that microbial chemosynthesis is also surprisingly pervasive throughout the dark oceans, serving as a ...
  • Exact reconstruction of ocean bottom velocity profiles from monochromatic scattering data 

    Merab, Andre A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1987-01)
    This thesis presents the theoretical and computational underpinnings of a novel approach to the determination of the acoustic parameters of the ocean bottom using a monochromatic source. The problem is shown to be ...
  • Exactly sparse delayed-state filters for view-based SLAM 

    Eustice, Ryan M.; Singh, Hanumant; Leonard, John J. (IEEE, 2006-12)
    This paper reports the novel insight that the simultaneous localization and mapping (SLAM) information matrix is exactly sparse in a delayed-state framework. Such a framework is used in view-based representations of the ...
  • Examining the effects of mid ocean ridge topography on 3D marine magnetometric resistivity model responses 

    Lassner, Lisa A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2004-06)
    Methods which measure seafloor resistivity are uniquely suited to studying hydrothermal circulation in the crust. The magnetometric resistivity (MMR) technique is a galvanic method which uses a bipole current source with ...
  • Expectation-maximization analysis of spatial time series 

    Smith, Keston W.; Aretxabaleta, Alfredo L. (Copernicus Publications on behalf of the European Geosciences Union and the American Geophysical Union, 2007-02-01)
    Expectation maximization (EM) is used to estimate the parameters of a Gaussian Mixture Model for spatial time series data. The method is presented as an alternative and complement to Empirical Orthogonal Function (EOF) ...
  • Expendable oceanographic mooring (XMOOR) 

    Frye, Daniel E.; Peters, Donald B.; Arthur, Richard (Woods Hole Oceanographic Institution, 1997-04)
    An expendable, self-deploying mooring (XMOOR) for shallow water applications has been developed to address Navy requirements for environmental monitoring. The project has been conducted jointly between the Woods Hole ...
  • An experimental analysis of the dynamics of a submerged tethered cradle in a seaway 

    Cohen, Jay Martin (Woods Hole Oceanographic Institution, 1972-06)
    Submerged recovery of small submersibles by means of surface tethered platforms offers the possibility of operations in sea states higher than is now possible using surface recovery means. The Woods Hole Oceanographic ...
  • Experimental and numerical studies of sound propagation over a submarine canyon northeast of Taiwan 

    Lin, Ying-Tsong; Duda, Timothy F.; Emerson, Chris; Gawarkiewicz, Glen G.; Newhall, Arthur E.; Calder, Brian; Lynch, James F.; Abbot, Philip A.; Yang, Yiing-Jang; Jan, Sen (IEEE, 2015-01-09)
    A study of sound propagation over a submarine canyon northeast of Taiwan was made using mobile acoustic sources during a joint ocean acoustic and physical oceanographic experiment in 2009. The acoustic signal levels ...
  • Experimental evaluation of CTD package hydrodynamic behavior and recommendations for improved lowering techniques 

    Berteaux, Henri O.; Walden, Robert G.; Clay, Peter R.; McDevitt, R. E. (Woods Hole Oceanographic Institution, 1983-07)
    This report is the last of a series of three reports on a comprehensive study of CTD instrument lowering mechanics. The first report, WHOI 79-81, "A Study of CTD Cables and Lowering Systems", examines the causes and ...