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 11 of 11 for “"ocean turbulence"”.
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Effects of ocean turbulence on the large-scale stratification and Small-Scale Particle Distributions
Part I: “The Middepth Ocean.” Away from polar regions, the ocean stratification from 1–3 km depth exhibits little horizontal variability and a strikingly exponential vertical structure. The stratification is maintained by a large-scale balance between the upwelling of cold water from the abyss and …
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Design and Simulation of a Towed Underwater Vehicle
Oceanographers are currently investigating small-scale ocean turbulence to understand how to better model the ocean. To measure ocean turbulence, one must measure fluid velocity with great precision. The three components of velocity can be used to compute the turbulent kinetic energy dissipation …
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Towfish Design, Simulation and Control
Sampling small scale ocean turbulence is one of the most important problems in oceanography. The turbulence can be near the noise level of current microscale profiling techniques and these techniques do not provide spatially and temporally dense measurements and can be labor intensive. A 5 beam …
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Finestructure and turbulence in the deep ocean
… salinity and density and compared to models of ocean turbulence. Images with vertically aligned periodic structure, called bands, are identified as salt fingers, while others with chaotic structure are turbulent. Images are found on interfaces that are 1-10m thick and have gradients at least …
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A DNS capability for obtaining underwater light field and retrieving upper ocean conditions via in-water light measurements
Predicting the ocean surface conditions (surface elevation, temperature, wind speed, etc.) becomes more and more important for both real life and military applications. This thesis presents a direct numerical simulation (DNS) capability of solving complicated natural light field patterns in the …
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The behavior of Fe3+ coordination in alginate-catechol networks
… threads allow mussels to remain steadfast on ocean rocks despite ocean turbulence, facilitated by the simultaneous elasticity and hardness of the byssus coating. Inspired by the metal-coordination chemistry found in byssus coating, scientists have synthesized an array of self-healing hydrogels …
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Modelling the speciation and biogeochemistry of iron in oceanic surface waters at the Bermuda Atlantic Time-series Study site
… forms in the upper mixed layer of the ocean is analysed. Using the model an initial quantitative assessment is made of how this cycling influences iron uptake by phytoplankton and its loss via particulate export. The model is forced with observed dust deposition rates, mixed layer …
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Sediment plumes and financial modeling in the context of deep-sea polymetallic nodule mining
… return water sediment plumes discharged to the ocean during nodule mining operations, and (iii) the financial modeling of a nodule mining operation and the analysis of royalty payment systems for the International Seabed Authority. A nodule collector vehicle will operate on the seabed to pick up …
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Three-Dimensional Unsteady Hydrodynamics of Tidal Turbines
… environment, due to the presence of waves and ocean turbulence. The turbines sustain damage due to the fluctuating loads that result from the unsteady flow, either from high-cycle fatigue or from extreme loading events exceeding the ultimate tensile strength of components. In this thesis, the …
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Dynamics and parameterization of stably stratified turbulence: implications for estimates of mixing in geophysical flows
… of overturns in stably-stratified shear-flow turbulence and the fundamental length scales constructed from dimensional analysis of basic physical quantities. In geophysical flows such as the ocean, overturns are relatively easy to observe while the basic quantities are not. As such, overturns …
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Modelling turbulence and transport of buoyant material in the ocean surface mixed layer
The ocean mixed layer (OML) is a significant and dynamically active part of the ocean which plays an important role in climate variability. Here, atmospheric processes such as winds, heat fluxes or density differences drive the generation of small-scale, three-dimensional turbulence and mixing of …