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 31 for “"density stratification"”.
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Mixing and general circulation dynamics : theory and observations
… an integral constraint relating the interior stratification and air-sea heat fluxes is derived, based on the condition that the total mass of water of given density is constant in a steady state ocean. Two simple models are then used to examine the way the numerically small mixing, together …
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Anisotropic Turbulence Models for Wakes in an Active Ocean Environment
… in an oceanic environment. The effects of density stratification are considered, and the models are validated against laboratory experiments mimicking the stratified ocean environment, and against previous experimental study of wakes subjected to a density stratification. The turbulence …
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Stratified and stirred : monsoon freshwater in the Bay of Bengal
… surface boundary layer thickness and associated density stratification. Submesoscale instabilities contribute to lateral stirring and tracer dispersal. These dynamics are investigated in the Bay of Bengal, motivated by the upper ocean's potentially coupled interactions with Monsoon winds and …
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Study of the role of differential diffusion and equation of state on the features of stably stratified turbulent channel flow using direct numerical simulations
… applications to environmental flows. The density variation in such flows, particularly that observed in water bodies depends on temperature and salinity (salt content) through an equation of state (EoS). The molecular diffusion of the temperature and salinity in such flows differ …
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Experimental investigation of mixing in a stratified fluid due to diffusion-driven flows in a loosely-packed particle layer
… exist along a sloped boundary in a fluid with a density gradient that varies with height, so these flows will also exist along the curved surface of a spherical boundary. A particle layer was created using 6.35 mm diameter Polystyrene spheres in a salt-stratified fluid. A linear density …
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Stratification on the Skagit Bay tidal flats
Estuarine density stratification may be controlled primarily by cross-shore processes (analogous to longitudinal control in narrow estuaries), or by both cross- and alongshore processes (typical of coastal plumes). Here field observations and numerical modeling are used to investigate …
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Stability analysis of gravity-driven viscosity-stratified coating flows
… susceptible to an instability due to viscosity stratification even without the effects of surface tension, density stratification or, surprisingly, inertia. In addition, waves with the largest growth typically occur at finite wavelengths; the properties of these waves are often of greatest …
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Stratification on the Skagit Bay tidal flats
Estuarine density stratification may be controlled primarily by cross-shore processes (analogous to longitudinal control in narrow estuaries), or by both cross- and alongshore processes (typical of coastal plumes). Here field observations and numerical modeling are used to investigate …
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Scattering of coastal-trapped waves by irregularities in coastline and topography
… Particular attention is paid to the role of stratification because, as shown, the introduction of even modest stratification can eliminate backscattered free-waves with large wavenumbers which occur, theoretically, in a barotropic ocean. An analytical solution is presented for the scattering …
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Internal tide generation by tall ocean ridges
… by a tall symmetric ridge in a uniform density stratification. A modal decomposition technique was developed to characterize the structure of the experimental wave fields generated by 2D model topographies in a specially configured wave tank. The theory accurately predicts the low mode …
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Interference and resonance of internal gravity waves
… waves propagate through a varying background density stratification. We begin by theoretically studying internal waves that are harmonically forced at a horizontal level above a semi-infinite, non-uniform density stratification. Starting with a two-layer model, we identify the existence of …
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Changes in Antarctic Bottom Water Formation During Interglacial Periods
… increase in the strength of the Southern Ocean density stratification due to surface water freshening. Any reduction in AABW formation has important implications for global climate as AABW plays a vital role in the cycling of carbon in the world’s ocean. The primary question this study seeks to …
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Fluid dynamics of sinking carbon dioxide hydrate particle releases for direct ocean carbon sequestration
… sunk 100 m before completely dissolving. Ambient density stratification and currents will also affect particle descent, and in turn the dilution of dissolved CO₂. Three methods of injection of composite particles were evaluated, each with unique merits. Firstly, we can release hydrate particles …
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A global map of tidal dissipation over abyssal hills
… oscillations widely found in fluids exhibiting density stratification, such as the ocean. Such waves may be produced by tidal currents flowing over rough seafloors; they are then called internal tides. As they travel away from the seafloor, internal tides tend to attain high amplitudes and break …
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A sphere settling in a stratified fluid at small Reynolds number
… wake of a microscale sphere settling through a density stratification. A video-microscope was used to magnify and image apparent displacements of a micron-sized random-dot pattern. Due to the nature of the wake, density gradient perturbations in the horizontal direction greatly exceed those in …
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The hydrological and limnological characterization of two Canadian water catchments sensitive to anthropogenic influences: Crawford Lake, Ontario and Old Crow Flats, Yukon
… shores impede seasonal turnover, maintaining density stratification across the chemocline. Chemical and isotopic analysis identified a dense, highly conductive groundwater-fed monimolimnion permanently isolated from a less dense, more dilute mixolimnion. High concentrations of dissolved oxygen …
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Stratified and stirred: Monsoon freshwater in the Bay of Bengal
… surface boundary layer thickness and associated density stratification. Submesoscale instabilities contribute to lateral stirring and tracer dispersal. These dynamics are investigated in the Bay of Bengal, motivated by the upper ocean’s potentially coupled interactions with Monsoon winds and …
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Geomorphology and Dynamics of a Sand Wave in Lower Chesapeake Bay, Virginia
… sand wave. Simultaneously, vertical profiles of density were measured. Time series analysis of the shear stress data at 5 cm above the bed revealed three types of constituents: (a) long period trends, (b) wave-associated events, and (c) turbulence. The turbulent part of the record was found to be …
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The Effect of Arctic River Hydrological Cycles on Arctic Ocean Circulation
… (1) the formation of shelf and basin scale density currents; (2) maintenance of the strong density stratification; (3) control of the thickness and strength of the ice pack; and (4) control of deep convection. Sources and sinks of freshwater in the Arctic include: shoreline discharge as …
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The flow of rivers into lakes: Experiments and models
… models. In laboratory experiments, the evolving density stratification in a basin fed by underflowing gravity currents was measured. The transport pathway of the inflowing fluid was visualised with dyes. Gravity currents underflowing uniform ambient uid over an intermediate range of source …
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