Now showing items 824-843 of 854

  • Variable buoyancy system metric 

    Jensen, Harold Franklin (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2009-06)
    Over the past 20 years, underwater vehicle technology has undergone drastic improvements, and vehicles are quickly gaining popularity as a tool for numerous oceanographic tasks. Systems used on the vehicle to alter buoyancy, ...
  • Variational data assimilative modeling of the Gulf of Maine in spring and summer 2010 

    Li, Yizhen; He, Ruoying; Chen, Ke; McGillicuddy, Dennis J. (John Wiley & Sons, 2015-05-19)
    A data assimilative ocean circulation model is used to hindcast the Gulf of Maine [GOM) circulation in spring and summer 2010. Using the recently developed incremental strong constraint 4D Variational data assimilation ...
  • Verification of a six-degree of freedom simulation model for the REMUS autonomous underwater vehicle 

    Prestero, Timothy (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2001-09)
    Improving the performance of modular, low-cost autonomous underwater vehicles (AUVs) in such applications as long-range oceanographic survey, autonomous docking, and shallow-water mine countermeasures requires improving ...
  • Verification of numerical models for hydrothermal plume water through field measurements at TAG 

    Wichers, Sacha (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2005-02)
    Hydrothermal vents discharge superheated, mineral rich water into our oceans, thereby providing a habitat for exotic chemosynthetic biological communities. Hydrothermal fluids are convected upwards until they cool and ...
  • Vertical structure of dissipation in the nearshore 

    Feddersen, Falk; Trowbridge, John H.; Williams, Albert J. (American Meteorological Society, 2007-07)
    The vertical structure of the dissipation of turbulence kinetic energy was observed in the nearshore region (3.2-m mean water depth) with a tripod of three acoustic Doppler current meters off a sandy ocean beach. Surface ...
  • Vessel noise effects on delphinid communication 

    Jensen, Frants H.; Bejder, Lars; Wahlberg, Magnus; Aguilar De Soto, Natacha; Johnson, Mark P.; Madsen, Peter T. (Inter-Research, 2009-12-03)
    Increasing numbers and speeds of vessels in areas with populations of cetaceans may have the cumulative effect of reducing habitat quality by increasing the underwater noise level. Here, we first use digital acoustic tags ...
  • Visual : a visualization system for accessing and analyzing multi-sensor data 

    Lerner, Steven A. (Woods Hole Oceanographic Institution, 1999-08)
    Visual is a visualization system used to access and analyze high-volume multi-sensor data collected from remotely operated underwater vehicles. Since 1991, scientists have used Visual for scientific visualization and ...
  • Visually augmented navigation for autonomous underwater vehicles 

    Eustice, Ryan M.; Pizarro, Oscar; Singh, Hanumant (IEEE, 2008-04)
    As autonomous underwater vehicles (AUVs) are becoming routinely used in an exploratory context for ocean science, the goal of visually augmented navigation (VAN) is to improve the near-seafloor navigation precision of such ...
  • VOICE - a spectrogram computer display package 

    Martin, Ann; Catipovic, Josko A.; Fristrup, Kurt M.; Tyack, Peter L. (Woods Hole Oceanographic Institution, 1990-07)
    A real-time spetrogram instrument has been developed to provide an inexpensive and field-portable instrument for the analysis of animal sounds. The instrument integrates a computer graphics display package with a PC-AT ...
  • Vorticity control for efficient propulsion 

    Anderson, Jamie M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1996-02)
    Vorticity control is a new paradigm in propulsion hydrodynamics. In this thesis, we study fish-like propulsion strategies as concepts in vorticity control. Our motivation for this research stems from the remarkable ...
  • Vorticity generation by short-crested wave breaking 

    Clark, David B.; Elgar, Steve; Raubenheimer, Britt (American Geophysical Union, 2012-12-21)
    Eddies and vortices associated with breaking waves rapidly disperse pollution, nutrients, and terrestrial material along the coast. Although theory and numerical models suggest that vorticity is generated near the ends of ...
  • Vorticity measurements within the bottom boundary layer in the Strait of Juan De Fuca 

    Fredericks, Janet J.; Trowbridge, John H.; Williams, Albert J. (Woods Hole Oceanographic Institution, 1998-07)
    Electromagnetic fluctuations and turbulent vorticity fluctuations were measured over a nine month period in the strong tidal flows of the Strait of Juan De Fuca off the coast of the Olympic Peninsula of Washington. ...
  • Water samplers for open ocean tracer release experiments 

    Donoghue, Terence; Ledwell, James R.; Doherty, Kenneth W. (Woods Hole Oceanographic Institution, 1998-12)
    Conventional "spot" sampling of patchy distributions of oceanic constituents can lead to sampling errors. Interpretation of results based on data of disparate temporal or spatial resolution can be difficult or impossible. ...
  • Wave breaking turbulence at the offshore front of the Columbia River Plume 

    Thomson, James M.; Horner-Devine, Alex R.; Zippel, Seth; Rusch, Curtis; Geyer, W. Rockwell (John Wiley & Sons, 2014-12-19)
    Observations at the Columbia River plume show that wave breaking is an important source of turbulence at the offshore front, which may contribute to plume mixing. The lateral gradient of current associated with the plume ...
  • Wave dissipation by muddy seafloors 

    Elgar, Steve; Raubenheimer, Britt (American Geophysical Union, 2008-04-12)
    Muddy seafloors cause tremendous dissipation of ocean waves. Here, observations and numerical simulations of waves propagating between 5- and 2-m water depths across the muddy Louisiana continental shelf are used to estimate ...
  • Wave evolution across the Louisiana shelf 

    Engelstad, Anita; Janssen, T. T.; Herbers, T. H. C.; van Vledder, Gerbrant; Elgar, Steve; Raubenheimer, Britt; Trainor, Lincoln; Garcia-Garcia, Ana (2012-10)
    Observations and third-generation wave model hindcasts of ocean surface gravity waves propagating across the Louisiana shelf show that the effects of the mud environment on wave evolution are complex and episodic. Whereas ...
  • Wave scattering from cylindrical fluid inclusions in an elastic medium and determination of effective medium properties 

    Laible, Henry A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1995-09)
    The goal of this thesis is to be able to predict acoustic wave speeds in sea ice with known concentrations of inhomogeneities. To accomplish this, ice is modeled as a solid in which cylindrical fluid brine channels are ...
  • Wave-driven along-channel subtidal flows in a well-mixed ocean inlet 

    Wargula, Anna E.; Raubenheimer, Britt; Elgar, Steve (John Wiley & Sons, 2014-05-20)
    Observations of waves, flows, and water levels collected for a month in and near a long, narrow, shallow (∼ 3000 m long, 1000 m wide, and 5 m deep), well-mixed ocean inlet are used to evaluate the subtidal (periods > 30 ...
  • Wave-driven setup and alongshore flows observed onshore of a submarine canyon 

    Apotsos, Alex; Raubenheimer, Britt; Elgar, Steve; Guza, R. T. (American Geophysical Union, 2008-07-19)
    The effect of alongshore variations in the incident wavefield on wave-driven setup and on alongshore flows in the surfzone is investigated using observations collected onshore of a submarine canyon. Wave heights and radiation ...
  • Wave-induced sediment transport and onshore sandbar migration 

    Hsu, Tian-Jian; Elgar, Steve; Guza, R. T. (2006-04-06)
    The 25-m onshore migration of a nearshore sandbar observed over a 5-day period near Duck, NC is simulated with a simplified, computationally efficient, wave-resolving singlephase model. The modeled sediment transport is ...