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.
Results
Showing 1 to 20 of 34 for “"Drifter"”.
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A drifter-based self-powered piezoelectric sensor for ocean wave measurements
In the present research, a drifter-based piezoelectric sensor is proposed to measure ocean waves’ height and period. To analyze the motion principle and the working performance of the proposed drifter-based piezoelectric sensor, a dynamic model is developed. The developed dynamic model investigates …
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WAVE AND CURRENT OBSERVATIONS IN A TIDAL INLET USING GPS DRIFTER BUOYS
The Wave Resolving Drifter (WRD) Buoy, developed at NPS, was refined by adding an accelerometer and utilizing horizontal Doppler velocity measurements to better resolve the wave surface motions. The WRD Buoy was validated against a Datawell Waverider-GPS buoy by comparing bulk wave statistics, wave …
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Observing and quantifying kinematic properties and lagrangian coherent structures of ocean flows using drifter experiments
… thesis analyzes data from two types of unique drifter experiments in order to characterize two aspects of ocean flows that are often difficult to study. First, vertical velocities and their associated transport processes are often challenging to observe in the real ocean since vertical …
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Observing and Quantifying Kinematic Properties and Lagrangian Coherent Structures of Ocean Flows using Drifter Experiments
… thesis analyzes data from two types of unique drifter experiments in order to characterize two aspects of ocean flows that are often difficult to study. First, vertical velocities and their associated transport processes are often challenging to observe in the real ocean since vertical …
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Tracking Sargassum in the Caribbean: the design, deployment, and validation of a low-cost surface drifter
… presents the development of a low-cost surface drifter designed to track and monitor the abundant Sargassum seaweed in the Caribbean. The phenomenon of the Great Atlantic Sargassum Belt (GASB), inundating coastlines in the northern equatorial Atlantic and Gulf of Mexico, has raised concerns due …
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Tracking Sargassum in the Caribbean: The Design, Deployment, and Validation of a Low-Cost Surface Drifter
… presents the development of a low-cost surface drifter designed to track and monitor the abundant Sargassum seaweed in the Caribbean. The phenomenon of the Great Atlantic Sargassum Belt (GASB), inundating coastlines in the northern equatorial Atlantic and Gulf of Mexico, has raised concerns due …
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Recording, in-situ processing and near real-time satellite transmission of acoustic data from a low-cost marine drifter buoy
… validating a low-cost, satellite-linked acoustic drifter buoy system capable of real-time underwater noise assessment. The thesis begins with a general introduction to marine soundscapes and underwater radiated noise (URN), covering how anthropogenic sound overlaps with biological sound and the …
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Modeling Studies of Antarctic Krill (<i>Euphausia superba</i>) Survival During Transport Across the Scotia Sea and Environs
… fields obtained from HOPS were used with drifter studies to determine regions and pathways that allow transport of Antarctic krill to South Georgia. Pelagic phytoplankton concentrations along the simulated drifter trajectories were extracted from historical Coastal Zone Color Scanner …
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Lagrangian dispersion and deformation in submesoscale flows
… Lagrangian trajectories of observed and modeled drifters. We analyze statistics of observed drifter pairs to characterize turbulent dispersion at submeso-scales. Contrary to theoretical expectations, we find that nonlocal velocity gradients associated with mesoscale eddies dominate the separation …
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Near-inertial internal Poincare waves in Lake Michigan: Seasonal variability and effects on lateral dispersion and turbulent mixing
… than the inertial period. ^ The comparison of drifter and dye release experiments demonstrates the important role of Poincaré wave-induced vertical shear on the dispersion in surface mixed layer. The 3-month observation of surface drifters released at the center of stratified southern basin …
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Development of low-cost in situ gas sensors for oceanographic applications
… was integrated into a custom-built surface drifter designed to entangle with Sargassum mats and send data autonomously. The drifter utilized commercial off-theshelf (COTS) components and cost roughly $1000 to build. After lab testing, a drifter was deployed in the Great Atlantic Sargassum …
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Development of Low-Cost In Situ Gas Sensors for Oceanographic Applications
… was integrated into a custom-built surface drifter designed to entangle with Sargassum mats and send data autonomously. The drifter utilized commercial off-theshelf (COTS) components and cost roughly $1000 to build. After lab testing, a drifter was deployed in the Great Atlantic Sargassum …
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Ring Dynamics in the Western Gulf of Mexico
… of Mexico. By comparing the model results with drifter and hydrographic data several new insights into ring/ring and ring/slope interactions are seen. A Loop Current ring may merge with a fossil ring along the slope. The signature of this merger is evident in many drifter tracks suggesting that …
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Physical controls on copepod aggregations in the Gulf of Maine
… kinetic energy are computed from a Lagrangian drifter dataset and an adaptive technique that allows for higher spatial resolution while also keeping uncertainty low. Eddy diffusivity is also computed over different regions of the GOM in an attempt to quantify the spreading of a patch of …
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Flow Kinematics and Dynamics of the Gulf Stream From Composite Imagery
… unique set of contemporaneous satellite-tracked drifters and five-day composite satellite images of the North Atlantic is studied in order to infer the near-surface flow kinematics and dynamics of the Gulf Stream. Using fractal and spectral analyses, two kinematic models, and a potential …
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Physical controls on copepod aggregations in the Gulf of Maine
… kinetic energy are computed from a Lagrangian drifter dataset and an adaptive technique that allows for higher spatial resolution while also keeping uncertainty low. Eddy diffusivity is also computed over different regions of the GOM in an attempt to quantify the spreading of a patch of …
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Lagrangian dispersion and deformation in submesoscale flows
… Lagrangian trajectories of observed and modeled drifters. We analyze statistics of observed drifter pairs to characterize turbulent dispersion at submeso-scales. Contrary to theoretical expectations, we find that nonlocal velocity gradients associated with mesoscale eddies dominate the separation …
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Ocean Surface Maps From Blending Disparate Data Through Normal Mode Analysis
… analysis of high resolution current meter and drifter data reveals the significant forcing features detectable by readily available observing techniques. These observations are combined with boundary data extracted from the U.S. Navy's Modular Ocean Data Assimilation System (MODAS) through …
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Evaluation of transport relative to the tidal mixing front on southern Georges Bank
… of the U.S. GLOBEC Georges Bank program, drogued drifters and dye tracer were released into the pycnocline on the southern flank of Georges Bank to measure advective and diffusive transport relative to the tidal mixing front in May 1999. Potential density measurements placed the tidal mixing front …
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Evaluation of transport relative to the tidal mixing front on Southern Georges Bank
… of the U.S. GLOBEC Georges Bank program, drogued drifters and dye tracer were released into the pycnocline on the southern flank of Georges Bank to measure advective and diffusive transport relative to the tidal mixing front in May 1999. Potential density measurements placed the tidal mixing front …
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