Now showing items 497-516 of 854

  • Modeling deep ocean shipping noise in varying acidity conditions 

    Udovydchenkov, Ilya A.; Duda, Timothy F.; Doney, Scott C.; Lima, Ivan D. (Acoustical Society of America, 2010-08-19)
    Possible future changes of ambient shipping noise at 0.1–1 kHz in the North Pacific caused by changing seawater chemistry conditions are analyzed with a simplified propagation model. Probable decreases of pH would cause ...
  • Modeling of monostatic bottom backscattering from three-dimensional volume inhomogeneities and comparisons with experimental data 

    Li, Dan (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1997-09)
    Acoustic propagation in the ocean inevitably encounters inhomogeneities of various types, which give rise to scattering. Acoustic scattering from rough water /bottom interfaces comprised of exposed rocks and sea mountains ...
  • A modeling study of acoustic propagation through moving shallow-water solitary wave packets 

    Duda, Timothy F.; Preisig, James C. (IEEE, 1999-01)
    Propagation of 400-Hz sound through continental-shelf internal solitary wave packets is shown by numerical simulation to be strongly influenced by coupling of normal modes. Coupling in a packet is controlled by the mode ...
  • Modeling surf zone tracer plumes : 1. Waves, mean currents, and low-frequency eddies 

    Feddersen, Falk; Clark, David B.; Guza, R. T. (American Geophysical Union, 2011-11-18)
    A model that accurately simulates surf zone waves, mean currents, and low-frequency eddies is required to diagnose the mechanisms of surf zone tracer transport and dispersion. In this paper, a wave-resolving time-dependent ...
  • Modeling surf zone tracer plumes : 2. Transport and dispersion 

    Clark, David B.; Feddersen, Falk; Guza, R. T. (American Geophysical Union, 2011-11-18)
    Five surf zone dye tracer releases from the HB06 experiment are simulated with a tracer advection diffusion model coupled to a Boussinesq surf zone model (funwaveC). Model tracer is transported and stirred by currents and ...
  • Modeling turbulent dispersion on the North Flank of Georges Bank using Lagrangian Particle Methods 

    Proehl, Jeffrey A.; Lynch, Daniel R.; McGillicuddy, Dennis J.; Ledwell, James R. (2004-09-29)
    Circulation and transport at the North Flank of Georges Bank are studied using a data-assimilative 3-D model of frontal dynamics under stratified, tidally energetic conditions over steep topography. The circulation model ...
  • Modeling weak fluctuations of undersea telemetry signals 

    Duda, Timothy F. (IEEE, 1991-01)
    Numerical calculation of acoustic field perturbation expressions can be used to predict fluctuations after propagation through ocean sound-speed structures, but before the onset of multipath. The general form of the ...
  • Modeling wind forcing in phase resolving simulation of nonlinear wind waves 

    Kalmikov, Alexander G. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2010-02)
    Wind waves in the ocean are a product of complex interaction of turbulent air flow with gravity driven water surface. The coupling is strong and the waves are non-stationary, irregular and highly nonlinear, which restricts ...
  • Modelling bottom stress in depth-averaged flows 

    Jenter, Harry L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1989-05)
    The relationship between depth-averaged velocity and bottom stress for wind-driven flow in unstratified coastal waters is examined here. The adequacy of traditional linear and quadratic drag laws is addressed by comparison ...
  • Models : tools for synthesis in international oceanographic research programs 

    McGillicuddy, Dennis J.; deYoung, Brad; Doney, Scott C.; Glibert, Patricia M.; Stammer, Detlef; Werner, Francisco E. (Oceanography Society, 2010-09)
    Through its promotion of coordinated international research programs, the Intergovernmental Oceanographic Commission (IOC) has facilitated major progress on some of the most challenging problems in oceanography. Issues ...
  • Models of harmful algal blooms : conceptual, empirical, and numerical approaches 

    McGillicuddy, Dennis J. (2010-12-08)
    Now is an historic time in the field of harmful algal bloom (HAB) science. HAB problems are growing worldwide, and society’s need for understanding these phenomena is more pressing than ever. Technological advances have ...
  • Mooring design using wave-state estimate from the Southern Ocean 

    Schulz, E. W.; Grosenbaugh, Mark A.; Pender, L.; Greenslade, D. J. M.; Trull, Thomas W. (American Meteorological Society, 2011-10-01)
    The Southern Ocean Flux Station was deployed near 47°S, 140°E. The extreme wind and wave conditions at this location require appropriate mooring design, which includes dynamic fatigue analysis and static analysis. An ...
  • Mortality of fish subjected to explosive shock as applied to oil well severance on Georges Bank 

    Baxter, Lincoln; Hays, Earl E.; Hampson, George R.; Backus, Richard H. (Woods Hole Oceanographic Institution, 1982-12)
    A very extensive bibliography of papers on underwater explosions and their effects on marine life has been collected and summarized. When exposed to blast effects, vertebrates with swim bladders or lungs that contain ...
  • Motion sensitivity of flame ionization detectors 

    Gularte, Ronald Carl (Woods Hole Oceanographic Institution, 1972-05)
    A portable gas chromatograph, using a single flame ionization detector, was constructed. The unit was tested for response to surge, sway and heave accelerations up to 0.3g. Also the detector's response was studied for ...
  • Multicarrier communication over underwater acoustic channels with nonuniform Doppler shifts 

    Li, Baosheng; Zhou, Shengli; Stojanovic, Milica; Freitag, Lee E.; Willett, Peter (IEEE, 2008-04)
    Underwater acoustic (UWA) channels are wideband in nature due to the small ratio of the carrier frequency to the signal bandwidth, which introduces frequency-dependent Doppler shifts. In this paper, we treat the channel ...
  • Multichannel detection for wideband underwater acoustic CDMA communications 

    Stojanovic, Milica; Freitag, Lee E. (IEEE, 2006-07)
    Direct-sequence (DS) code-division multiple access (CDMA) is considered for future wideband mobile underwater acoustic networks, where a typical configuration may include several autonomous underwater vehicles (AUVs) ...
  • Multichannel maximum entropy method of spectral analysis applied to offshore structures 

    Briggs, Michael Jeffrey (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1981-06)
    The multichannel Maximum Entropy Method (MEM) of spectral analysis is developed and applied in the dynamic analysis of offshore structures. Two different algorithms are implemented and compared with the conventional ...
  • Multipath time-delay estimation via the EM algorithm 

    Feder, Meir; Weinstein, Ehud (Woods Hole Oceanographic Institution, 1987-01)
    We consider the application of the EM algorithm to the multipath time delay estimation problem. The algorithm is developed for the case of deterministic (known) signals, as well as for the case of wide-sense stationary ...
  • Multiple convergence zone acoustic telemetry feasibility test report 

    Catipovic, Josko A.; von der Heydt, Keith; Merriam, John Stevens; Sandsmark, Geir Helge (Woods Hole Oceanographic Institution, 1991-11)
    This report describes a multiple CZ acoustic telemetry experiment conducted off the coast of California 1/28/90-2/2/90. The goal was to design a maximally robust high speed underwater modem suitable for data telemetry for ...
  • Multiple source location estimation using the EM Algorithm 

    Weinstein, Ehud; Feder, Meir (Woods Hole Oceanographic Institution, 1986-07)
    We present a computationally efficient scheme for multiple source location estimation based on the EM Algorithm. The proposed scheme is optimal in the sense that it converges iteratively to the exact Maximum Likelihood ...