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 19 of 19 for “"buoyant plume"”.
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On convective penetration of a buoyant plume into a stably stratified layer
The convective penetration of a buoyant plume from a uniform layer into an overlying stably stratified layer is relevant to a wide variety of geophysical and industrial flows. An example we focus on is the hydration of the tropical lower stratosphere (TLS) by overshooting deep convection in the …
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Forward scattering of a pulsed continuous wave signal through laminar and turbulent thermal plumes
… propagation or an acoustic signal through a buoyant plume are discussed. Two distinct testing sights were used. One made use of a small fresh water tank in NUWC to provide a controlled plume. The other used a larger salt water tank at WHOI to create a more realistic oceanic model. Using the …
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Modeling Circulation Dynamics and Submarine Melt in Greenland Fjords
… of meltwater at depth generates an upwelling plume that entrains warm ocean water as it rises along the terminus, increasing submarine melt and driving a fjord-scale exchange flow. However, due to sparse ocean-glacier observations, we lack a process understanding of how plumes control fjord …
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Verification of numerical models for hydrothermal plume water through field measurements at TAG
… advect laterally with the current. The neutrally buoyant plume layer can have length scales on the order of several kilometers, and it therefore provides the best means to detect the presence of vent fields on the seafloor, which typically have length scales on the order of a few meters. This …
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Verification of numerical models for hydrothermal plume water through field measurements at TAG
… advect laterally with the current. The neutrally buoyant plume layer can have length scales on the order of several kilometers, and it therefore provides the best means to detect the presence of vent fields on the seafloor, which typically have length scales on the order of a few meters. This …
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The chemistry of iron in hydrothermal plumes
… for<br/>dissolved Fe export via hydrothermal plumes to the deep-ocean.<br/>To investigate the fate of hydrothemally sourced Fe, samples were collected from hightemperature<br/>hydrothermal vent-field plumes at 9°N on the East Pacific Rise and at 5°S on<br/>the Mid-Atlantic Ridge. The samples …
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Some geological implications of the flow of clay-water mixtures
… the different problem of mixing in a turbulent buoyant plume. First, the injection of gas and water from a central source into a two-dimensional layer of clay confined between two circular horizontal plates is investigated. This provides a model of the potential pressurisation and failure of the …
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Hydrothermal plumes and processes in Indian Ocean
… cycling of the whole ocean through hydrothermal plumes is comparable to the mixing time of the oceans (few thousand years). Hence, understanding hydrothermal plume processes is crucial if their impact on the global geochemical cycles of elements is to be assessed. One of the most important …
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Dinoflagellate blooms and physical systems in the Gulf of Maine
… Cape Ann, Massachusetts, in a coastally trapped buoyant plume. This plume appears to have been formed off Maine by the outflow from the Androscoggin and Kennebec Rivers. Flow rates of these rivers, hydrographic sections, and satellite images suggest that the plume had a duration of about a month, …
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Turbulent entrainment in flows induced by distributed buoyancy sources
… and scalar edge measurements on an axisymmetric plume created by a continuous point source release of buoyancy. By conditionally sampling the velocity measurements based on the presence of both eddies and plume fluid, engulfment, whereby large pockets of ambient are engulfed in to the plume, was …
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On the Interaction of Natural Convection and Mechanical Ventilation
… level and extracted at a high level. A turbulent buoyant plume rising from a localised source of buoyancy interacts with this upward ventilation flow to establish a steady-state stratification with a buoyant upper layer above a layer of the supply fluid. In this thesis, we use experimental …
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Migration and trapping of CO₂ in saline aquifers
… the CO2 is a primary concern because it will be buoyant relative to the ambient groundwater and, as a result, will rise toward the top of the aquifer and may migrate laterally away from the injection site. To assess leakage risks and estimate aquifer capacity requires an accurate understanding of …
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Radial spreading of vertical buoyant jets in shallow water
… shallow water bodies. Often these effluents are buoyant with respect to the receiving environment. In many jurisdictions, regulations require that a certain dilution is achieved within a specified mixing zone. In shallow water it is likely that a portion of this dilution will have to be achieved …
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Experiments on the dynamics of buoyancy-driven flows in reactive porous media
… fluid is displaced vertically downwards by a buoyant reactive fluid. This creates a rectilinear reaction front, which is stabilised by buoyancy, and which moves downwards through the formation. The reaction front can be described by a simple mass balance in the case of slow displacement, and …
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Larval dispersal between hydrothermal vent habitats
… period. Passive movement via entrainment into buoyant plumes rising from smoker vents provides a pathway for larvae to get high above the bottom, and has implications for larval dispersal because vertical shear in flows above vents can cause trajectories in the plume to deviate considerably …
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The Influence of Layering and Time-Dependent Injection Rates on Gravity-Driven Flows in Porous Media
… investigate the controls on the spreading of a plume in the thin layer limit of a cross-bedded formation where the along-slope extent of the invading fluid is much larger than each individual layer. Rather surprisingly, it is found that a buoyant plume may rise above the lower boundary of the …
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Studies of the Arctic Ocean sea ice cover and hydrothermal heat fluxes
… also includes a separate study on hydrothermal plume modeling based on data collected during the AGAVE 2007 Expedition. An indirect method for estimating the heat flux of hydrothermal vents using buoyant plume dynamics in combination with water column observations is presented. The results show …
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Evaluating mantle and crustal processes using isotope geochemistry
… upwelling velocities and porosities of mantle plumes. The lower continental crust plays a pivotal role in understanding the composition and evolution of the continental crust and the petrogenesis of continental basalts. This chapter presents Re/Os isotope measurements which allow us to further …
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Turbulent convection from an area source in a confined space
… stratification produced by a turbulent lazy plume that is formed by the release of buoyant fluid from a circular source in a cylindrical container. This configuration allows us to explore a host of convection problems that uncover important features of the dynamics of turbulent plumes, …