Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 137 for “"Ocean currents"”.
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Radiating instability of nonzonal ocean currents
… field could be generated in the interior of the ocean away from the swift boundary currents. The energy radiation due to the temporal growth of non-trapped (radiating) disturbances in such a boundary current is thought to be one of the main sources for the described variability. The problem of …
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Radiating instability of nonzonal ocean currents
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
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Measurement of deep ocean currents with one-shot neutrally buoyant floats.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1968.
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Gaussian processes at the Helm(holtz): A more fluid model for ocean currents
Oceanographers are interested in predicting ocean currents and identifying divergences in a current vector field based on sparse observations of buoy velocities. Since we expect current velocity to be a continuous but highly non-linear function of spatial location, Gaussian processes (GPs) offer an …
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The hydrography and dynamics of the general oceanic environment of the Prince Edward Islands
The Southern Ocean is the name given to the oceanic region that surrounds the entire Antarctic continent. It comprises the southern extents of the Atlantic, Indian and Pacific Oceans. The Antarctic continent forms the southern boundary of the Southern Ocean, while the northern border is not …
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Evaluation of the operational Mercator Global Ocean analysis and forecast system modelled current vector product with in-situ ADCP data in the Southern Benguela upwelling system
Global ocean current vector datasets are frequently used to force, or are assimilated into, local and regional particle tracking and pollutant dispersal models, metocean forecasting platforms, climate analyses, and natural resource management applications. The Operational Mercator global ocean …
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Population Genetic Structure of the Temperate Scleractinian Coral, Oculina Arbuscula, in Coastal Georgia
… open with planktonic larvae exploiting ocean currents to travel long distances. However, recent studies report evidence of local larval recruitment. In this study, I hypothesized that populations of the temperate coral, Oculina arbuscula, are maintained primarily by local recruitment off …
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Distribution, growth, and transport of larval fishes and implications for population dynamics
… high mortality, and ease of transport in ocean currents. This dissertation demonstrates the value of combining larval data, collected in the field and the laboratory, with model simulations. In Chapter 2, analyses of field observations of ontogenetic vertical distributions of coral reef …
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Spatio-temporal Variability in Surface Ocean pCO2 Inferred from Observations
The variability of surface ocean pCO2 is examined on multiple spatial and temporal scales. Temporal autocorrelation analysis is used to examine pCO2 variability over multiple years. Spatial autocorrelation analysis describes pCO2 variability over multiple spatial scales. Spatial autocorrelation …
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Traveling waves in mode superposition
… to Vortex Induced Vibrations (VIV) because of ocean currents. Response prediction techniques which accurately estimate the strain due to VIV are of help in deciding how to mitigate VIV, and also to predict the life of the structure. Experiments conducted in the Gulf Stream provided data about …
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Flying on the Edge of Sea, Land and Sky - A new passenger terminal for the Grand Bahama International Airport
… land and sea formations of the Bahama islands; ocean currents and land-sea patterns may be associated with movements of people and machines, converging and diverging within the airport environment.
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Formation and Development of Diabatic Rossby Vortices in a 10-Year Climatology
… 314 DRVs form preferentially over warm ocean currents. All DRVs track to the east northeast. While more DRVs form during the warm season, a larger fraction of storms that explosively deepen occur during the cold season. Composite analyses bear strong resemblance to DRV structural plots …
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Mapping Belizean bonefish, permit, and tarpon fisheries and their threats
… occurring in shallow waters sheltered from ocean wave action. Decline in seagrass distribution was observed in deeper waters subjected to ocean currents and potential dredging. The results of both studies are assimilated to discuss potential avenues of research and the prioritization of …
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Deep-Sea Environment
… the abyssobenthic, and the hadal zones. The ocean floor is not a smooth featureless sedimentary plain as has been believed earlier, but instead it is of rough topography with numerous irregularities, deep depressions, many high seamounts, and elongate ridges and trenches, determined largely …
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Dynamics of long flexible cylinders at high-mode number in uniform and sheared flows
… at high-mode numbers in sheared and uniform ocean currents. As part of this thesis work, three separate experiments have been planned and executed. The objective of these tests was to create a set of model tests at high-mode numbers, the first test was in uniform currents and the other tests …
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Developing the next generation of Autonomous Underwater Gliders
… AUG operations due to a combination of changing ocean currents and depths. AUGs are traditionally optimized for performance in shallow (less than 200m) or deep water (200m to 1000m) environments. The design of a buoyancy drive on a deep-rated AUG does not support the pump rate required for fast …
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Effect of traveling waves on Vortex-Induced Vibration of long flexible cylinders
Offshore marine risers and pipelines, exposed to ocean currents, are susceptible to Vortex-Induced Vibration (VIV). Accurate prediction of VIV is necessary for estimating the fatigue life as well as for taking corrective measures to prevent the vibrations. State of the art response prediction …
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Developing the Next Generation of Autonomous Underwater Gliders
… AUG operations due to a combination of changing ocean currents and depths. AUGs are traditionally optimized for performance in shallow (less than 200m) or deep water (200m to 1000m) environments. The design of a buoyancy drive on a deep-rated AUG does not support the pump rate required for fast …
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Exploring Maneuvering Strategies for Heterogeneous Cooperative Navigation in Underwater Environments
… conditions, we altered the simulated ocean currents. For additional study we allowed the leader to operate at a higher speed to explore the relationship between energy use and estimation performance. Ultimately, the best maneuvering strategy was found to be the circling strategy due to …
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Behavioral responses of invertebrate larvae to water column cues
… were considered passive drifters in prevailing ocean currents. More recently, however, the paradigm has shifted toward active larval behavior mediating transport in the water column. Larvae in the plankton encounter a variety of physical, chemical, and biological cues, and their behavioral …
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