Now showing items 636-655 of 899

    • A preliminary study of shallow-water sonar issues : signal motion loss and reverberation noise 

      Stewart, W. Kenneth; Chu, Dezhang; Tang, Xiaoou (Woods Hole Oceanographic Institution, 1993-09)
      This preliminary investigation addresses key program elements for sonar sensing in a shallow-water environment to establish bounds on possible solutions and to reduce program uncertainty. The modeling and experimental ...
    • A probabilistic evaluation of tank ship damage in grounding events 

      Rawson, Charles E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1998-06)
      Recent international and domestic regulatory actions have resulted in significant changes to oil tanker designs and intensified attention on predicting tanker environmental performance following groundings or collisions. ...
    • Probabilistic evaluation of tankship damage in collision events 

      Crake, Kurtis W. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1998-06)
      An analytical method for precidicting the extent of damage in ship collisions is developed. The method calculates both the longitudinal and transverse extents of damage for the struck ship as a function of collision ...
    • Process modeling studies of physical mechanisms of the formation of an anticyclonic eddy in the central Red Sea 

      Chen, Changsheng; Li, Ruixiang; Pratt, Lawrence J.; Limeburner, Richard; Beardsley, Robert C.; Bower, Amy S.; Jiang, Houshuo; Abualnaja, Yasser; Xu, Qichun; Lin, Huichan; Liu, Xuehai; Lan, Jian; Kim, Taewan (John Wiley & Sons, 2014-02-25)
      Surface drifters released in the central Red Sea during April 2010 detected a well-defined anticyclonic eddy around 23°N. This eddy was ∼45–60 km in radius, with a swirl speed up to ∼0.5 m/s. The eddy feature was also ...
    • Progress and challenges in coupled hydrodynamic-ecological estuarine modeling 

      Ganju, Neil K.; Brush, Mark J.; Rashleigh, Brenda; Aretxabaleta, Alfredo L.; del Barrio, Pilar; Grear, Jason S.; Harris, Lora A.; Lake, Samuel J.; McCardell, Grant; O’Donnell, James; Ralston, David K.; Signell, Richard P.; Testa, Jeremy M.; Vaudrey, Jamie M. P. (Springer, 2015-07-07)
      Numerical modeling has emerged over the last several decades as a widely accepted tool for investigations in environmental sciences. In estuarine research, hydrodynamic and ecological models have moved along parallel tracks ...
    • Progressively communicating rich telemetry from autonomous underwater vehicles via relays 

      Murphy, Christopher A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2012-06)
      As analysis of imagery and environmental data plays a greater role in mission construction and execution, there is an increasing need for autonomous marine vehicles to transmit this data to the surface. Without access ...
    • A prony algorithm for shallow water waveguide analysis 

      Diemer, Ferdinand J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1987-08)
      Low frequency acoustic propagation in shallow water is examined from a normal mode context. By modelling the far field pressure field as a modal sum, propagating mode characteristics of wavenumber, initial phase, attennation ...
    • Propapation and attenuation characteristics of multilayered media 

      Koch, Stephen Patrick (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1979)
      An algorithm is proposed to numerically integrate the inhomogeneous depth-separated wave equation using a state variable technique. The solution obtained for two simple shallow water models is shown to agree well with ...
    • Propulsion in cubomedusae : mechanisms and utility 

      Colin, Sean P.; Costello, John H.; Katija, Kakani; Seymour, Jamie; Kiefer, Kristen (Public Library of Science, 2013-02-20)
      Evolutionary constraints which limit the forces produced during bell contractions of medusae affect the overall medusan morphospace such that jet propulsion is limited to only small medusae. Cubomedusae, which often possess ...
    • Propulsion optimization for ABE, an autonomous underwater vehicle (AUV) 

      Woodford, Thomas J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1991-09)
      The oceanographic community is moving towards unmanned autonomous vehicles to gather data and monitor scientific sites. The mission duration of these vehicles is dependent primarily on the power consumption of the ...
    • Protocols for calibrating multibeam sonar 

      Foote, Kenneth G.; Chu, Dezhang; Hammar, Terence R.; Baldwin, Kenneth C.; Mayer, Larry A.; Hufnagle, Lawrence C.; Jech, J. Michael (Acoustical Society of America, 2005-04)
      Development of protocols for calibrating multibeam sonar by means of the standard-target method is documented. Particular systems used in the development work included three that provide the water-column signals, namely ...
    • PSP toxin levels and plankton community composition and abundance in size-fractionated vertical profiles during spring/summer blooms of the toxic dinoflagellate Alexandrium fundyense in the Gulf of Maine and on Georges Bank, 2007, 2008, and 2010 : 1. Toxin levels 

      Deeds, Jonathan R.; Petitpas, Christian M.; Shue, Vangie; White, Kevin D.; Keafer, Bruce A.; McGillicuddy, Dennis J.; Milligan, Peter J.; Anderson, Donald M.; Turner, Jefferson T. (Elsevier, 2013-04-12)
      As part of the NOAA ECOHAB funded Gulf of Maine Toxicity (GOMTOX)1 project, we determined Alexandrium fundyense abundance, paralytic shellfish poisoning (PSP) toxin composition, and concentration in quantitatively-sampled ...
    • Quantification of coral heat shock proteins from individual coral polyps 

      Bromage, Erin; Carpenter, Lawrence; Kaattari, Stephen; Patterson, Mark (Inter-Research, 2009-02-11)
      The induction and regulation of heat shock proteins (hsps) is a significant defense mechanism that can preserve metabolic function and foster recovery from short-term stress events. Present coral sampling methodologies ...
    • Quantification of cuttlefish (Sepia officinalis) camouflage : a study of color and luminance using in situ spectrometry 

      Akkaynak, Derya; Allen, Justine J.; Mathger, Lydia M.; Chiao, Chuan-Chin; Hanlon, Roger T. (2012-11-19)
      Cephalopods are renowned for their ability to adaptively camouflage on diverse backgrounds. Sepia officinalis camouflage body patterns have been characterized spectrally in the laboratory but not in the field due to the ...
    • Quantification of the spatial and temporal evolution of stratified shear instabilities at high Reynolds number using quantitative acoustic scattering techniques 

      Fincke, Jonathan R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2015-02)
      The spatial and temporal evolution of stratified shear instabilities is quantified in a highly stratified and energetic estuary. The measurements are made using high-resolution acoustic backscatter from an array composed ...
    • Quantifying hurricane wind speed with undersea sound 

      Wilson, Joshua David (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2006-06)
      Hurricanes, powerful storms with wind speeds that can exceed 80 m/s, are one of the most destructive natural disasters known to man. While current satellite technology has made it possible to effectively detect and track ...
    • Quantifying vertical mixing in estuaries 

      Geyer, W. Rockwell; Scully, Malcolm E.; Ralston, David K. (Springer, 2008-10-21)
      Estuarine turbulence is notable in that both the dissipation rate and the buoyancy frequency extend to much higher values than in other natural environments. The high dissipation rates lead to a distinct inertial subrange ...
    • A quantitative assessment of the role of the parasite Amoebophrya in the termination of Alexandrium fundyense blooms within a small coastal embayment 

      Velo-Suarez, Lourdes; Brosnahan, Michael L.; Anderson, Donald M.; McGillicuddy, Dennis J. (Public Library of Science, 2013-12-04)
      Parasitic dinoflagellates of the genus Amoebophrya infect free-living dinoflagellates, some of which can cause harmful algal blooms (HABs). High prevalence of Amoebophrya spp. has been linked to the decline of some HABs ...
    • Quantitative imaging of calibrated acoustic backscatter data from the seafloor 

      Foote, Kenneth G.; Robinson, Stephen P.; Theobald, Peter D. (Institute of Acoustics, 2015-09-07)
      Two factors have often led to the neglect of instrument calibration and the loss of information in the imaging process: the power of the image and the convenient signal processing expedient of disregarding the physical ...
    • Radar remote sensing estimates of waves and wave forcing at a tidal inlet 

      Diaz Mendez, Guillermo M.; Haller, Merrick C.; Raubenheimer, Britt; Elgar, Steve; Honegger, David A. (American Meteorological Society, 2015-04)
      The time and space variability of wave transformation through a tidal inlet is investigated with radar remote sensing. The frequency of wave breaking and the net wave breaking dissipation at high spatial resolution is ...