Now showing items 338-357 of 841

  • Gas hydrate measurements at Hydrate Ridge using Raman spectroscopy 

    Hester, K. C.; Dunk, R. M.; White, Sheri N.; Brewer, Peter G.; Peltzer, Edward T.; Sloan, E. D. (2006-11-14)
    Oceanic gas hydrates have been measured near the seafloor for the first time using a seagoing Raman spectrometer at Hydrate Ridge, Oregon, where extensive layers of hydrates have been found to occur near the seafloor. All ...
  • Geoacoustic inversion by mode amplitude perturbation 

    Poole, Travis L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2007-02)
    This thesis introduces an algorithm for inverting for the geoacoustic properties of the seafloor in shallow water. The input data required by the algorithm are estimates of the amplitudes of the normal modes excited by ...
  • Geoacoustic inversion by mode amplitude perturbation 

    Poole, Travis L.; Frisk, George V.; Lynch, James F.; Pierce, Allan D. (Acoustical Society of America, 2008-02)
    This paper introduces a perturbative inversion algorithm for determining sea floor acoustic properties, which uses modal amplitudes as input data. Perturbative inverse methods have been used in the past to estimate bottom ...
  • Geoacoustic inversion by mode amplitude perturbation 

    Poole, Travis L.; Frisk, George V.; Lynch, James F.; Pierce, Allan D. (Acoustical Society of America, 2008-02)
    This paper introduces a perturbative inversion algorithm for determining sea floor acoustic properties, which uses modal amplitudes as input data. Perturbative inverse methods have been used in the past to estimate bottom ...
  • Geoacoustic inversion in laterally varying shallow-water environments using high-resolution wavenumber estimation 

    Becker, Kyle M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2002-02)
    Sound propagation in shallow water is highly dependent on the interaction of the sound field with the bottom. In order to fully understand this problem, it is necessary to obtain reliable estimates of bottom geoacoustic ...
  • Geophysical evidence from the MELT area for compositional controls on oceanic plates 

    Evans, Rob L.; Hirth, Greg; Baba, Kiyoshi; Forsyth, Donald W.; Chave, Alan D.; Mackie, Randall L. (2005-06-29)
    Magnetotelluric (MT) and seismic data, collected during the MELT experiment at the Southern East Pacific Rise (SEPR) constrain the distribution of melt beneath this mid-ocean-ridge spreading center and also the evolution ...
  • Geophysical modeling of collapse-prone zones at Rumble III seamount, southern Pacific Ocean, New Zealand 

    Tontini, F. Caratori; de Ronde, C. E. J.; Kinsey, James C.; Soule, Samuel A.; Yoerger, Dana R.; Cocchi, L. (John Wiley & Sons, 2013-10-18)
    Catastrophic collapses of submarine volcanoes have the potential to generate major tsunami, threatening many coastal populations. Recognizing the difficulties surrounding anticipations of these events, quantitative assessment ...
  • Georges Bank : a leaky incubator of Alexandrium fundyense blooms 

    McGillicuddy, Dennis J.; Townsend, David W.; Keafer, Bruce A.; Thomas, M. A.; Anderson, Donald M. (2012-09-21)
    A series of oceanographic surveys on Georges Bank document variability of populations of the toxic dinoflagellate Alexandrium fundyense on time scales ranging from synoptic to seasonal to interannual. Blooms of A. fundyense ...
  • Hand tools and mechanical accessories for a deep submersible 

    Winget, Clifford L. (Woods Hole Oceanographic Institution, 1969-05)
    This report presents the design and construction details for various mechanical hand tools and accessories used by a manned deep submersible. The tools require the use of a mechanical manipulator, and were designed specifically ...
  • Handbook of oceanographic engineering materials : volume I - metals and alloys 

    Dexter, Stephen C. (Woods Hole Oceanographic Institution, 1972-12)
    This handbook is intended to serve as an aid in materials selection to Oceanographic engineers and designers. As such it is intentionally limited to materials that may be used advantageously in the marine environment.
  • Heave and roll response of free floating bodies of cylindrical shape 

    Berteaux, Henri O.; Goldsmith, Roger A.; Schott, W. E. (Woods Hole Oceanographic Institution, 1977-02)
    The following report describes a computer solution to help predict the heave and roll response of free floating bodies of cylindrical shape when excited by random seas with known spectra. The basic concepts of harmonic ...
  • High continuous bandwidth multichannel acquisition system 

    von der Heydt, Keith (Woods Hole Oceanographic Institution, 1991-06)
    Multichannel data acquisition has been a keystone of 7 ONR sponsored Arctic acoustic research programs conducted jointly by WHOI and MIT investigators from 1978 through 1989. This report describes the status and capability ...
  • The high speed buffer board : a SAIL EIA-485 communications accelerator card for the vector measuring current meter 

    Singer, Robin C.; Butler, Douglas M. (Woods Hole Oceanographic Institution, 1990-07)
    A High Speed Buffer Board (HSBB) has been developed for the Vector Measuring Current Meter (VMCM) to implement the transmission of data at 9600 baud over an EIA-485 link. The HSBB significantly extends the VMCM communication ...
  • High-frequency acoustic scattering from turbulent oceanic microstructure : the importance of density fluctuations 

    Lavery, Andone C.; Schmitt, Raymond W.; Stanton, Timothy K. (Acoustical Society of America, 2003-11)
    Acoustic scattering techniques provide a unique and powerful tool to remotely investigate the physical properties of the ocean interior over large spatial and temporal scales. With high-frequency acoustic scattering it is ...
  • High-frequency bistatic scattering by sub-bottom gas bubbles 

    Chu, Dezhang; Williams, Kevin L.; Tang, Dajun; Jackson, Darrell R. (Acoustical Society of America, 1997-08)
    A previous study of high-frequency acoustic backscattering data collected at Eckernfoerde Bay, Germany revealed that scattering is mainly due to methane gas bubbles buried about a meter beneath the seafloor [Tang et al., ...
  • High-resolution mapping of mines and ripples at the Martha's Vineyard Coastal Observatory 

    Mayer, Larry A.; Raymond, Richard; Glang, Gerd; Richardson, Michael D.; Traykovski, Peter A.; Trembanis, Arthur C. (IEEE, 2007-01)
    High-resolution multibeam sonar and state-of-the- art data processing and visualization techniques have been used to quantify the evolution of seafloor morphology and the degree of burial of instrumented mines and mine-shapes ...
  • High-resolution numerical modeling of wave-supported gravity-driven mudflows 

    Hsu, Tian-Jian; Ozdemir, Celalettin E.; Traykovski, Peter A. (American Geophysical Union, 2009-05-14)
    Wave-supported gravity-driven mudflow has been identified as a major offshore fine sediment transport mechanism of terrestrial sediment into the coastal ocean. This transport process essentially occurs within the wave ...
  • Higher-order acoustic diffraction by edges of finite thickness 

    Chu, Dezhang; Stanton, Timothy K.; Pierce, Allan D. (Acoustical Society of America, 2007-12)
    A cw solution of acoustic diffraction by a three-sided semi-infinite barrier or a double edge, where the width of the midplanar segment is finite and cannot be ignored, involving all orders of diffraction is presented. The ...
  • A higher-order split-step Fourier parabolic-equation sound propagation solution scheme 

    Lin, Ying-Tsong; Duda, Timothy F. (Acoustical Society of America, 2012-07-03)
    A three-dimensional Cartesian parabolic-equation model with a higher-order approximation to the square-root Helmholtz operator is presented for simulating underwater sound propagation in ocean waveguides. The higher-order ...
  • A higher-order tangent linear parabolic-equation solution of three-dimensional sound propagation 

    Lin, Ying-Tsong (Acoustical Society of America, 2013-07-15)
    A higher-order square-root operator splitting algorithm is employed to derive a tangent linear solution for the three-dimensional parabolic wave equation due to small variations of the sound speed in the medium. The solution ...