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 29 for “"gravity current"”.
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Rotating gravity current and channel flows
… and laboratory Investigation of rotating gravity currents and channel flows is presented. The study is applicable to buoyancy driven flows through straits, mid ocean ridge valleys and fracture zones, and intermittent gravity currents. In the theoretical study two extensions are achieved to …
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Mixing Mechanisms in Density Intrusions
In addition to gravity current front dynamics, another mixing behavior has been studied (sedimentary double diffusion, SDD). Laboratory experiments have been performed which explore conditions the only previous study did not. The experimental data obtained herein has been combined with the data …
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Mixing and circulation of meltwater outflow plumes in polar fjords
… region of fluid forms near the end wall and a gravity current propagates towards the open end of the channel. In the experiments a steady state is attained in which the gravity current has approximately one half the depth of the channel and the filled region near the wall has the same density …
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The central New England sea breeze study
… temporal evolution of sea-breeze circulations, gravity currents, and fronts along the central New England coast. Sea breeze events were defined as occurring when the observed surface wind direction began the day outside the southeast quadrant, shifted to southeast by afternoon, then shifted back …
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The flow of rivers into lakes: Experiments and models
… 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 Reynolds number (Re_s) at constant Richardson number (Ri) …
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Detrainment and Settling of Sediment in Turbidity Currents: A Study to Inform Deep Seabed Mining
… creation, and subsequent traveling, of turbidity currents across the seabed as a result of deep-sea mining will lead to impacts on a scale that is not yet entirely understood. Building on decades of studies on gravity currents (both related and unrelated to deep-sea mining) the focus of this …
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Collinear Supergravity at Linear Order
… two. We use a similar approach to obtain a supergravity Lagrangian while using a non-conventional gauge fixing choice. The constructed Lagrangian maintains some similarities to the above two cases. We also identify the form of gauge field-current coupling as well as gravity-current coupling and …
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Shear Effects on Buoyancy-Generated Turbulence and Salt Fingers
… and laboratory experiments on a finger-favorable gravity current are applied to study turbulence in a salt finger favorable flow. The theory reproduces well previous observations for unsheared flow, and it predicts that heat can be transported more efficiently than salt, even in salt finger …
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An experimental study on mixing induced by gravity currents on a sloping bottom in a rotating fluid
Mixing induced by gravity currents on a sloping bottom was studied through laboratory experiments in a rotating fluid. The dense fluid on the sloping bottom formed a gravity current that could be in regimes where the flow was laminar or had waves. The mixing on a sloping bottom for gravity currents …
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An experimental study on mixing induced by gravity currents on a sloping bottom in a rotating fluid
Mixing induced by gravity currents on a sloping bottom was studied through laboratory experiments in a rotating fluid. The dense fluid on the sloping bottom formed a gravity current that could be in regimes where the flow was laminar or had waves. The mixing on a sloping bottom for gravity currents …
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Viscous fingering instabilities and gravity currents.–—
… studied in this thesis: a single-layer viscous gravity current spreading from a point source over a rigid surface, radial spreading of an intrusion displacing miscible fluid in a Hele-Shaw cell, and finally, a viscous gravity current spreading from a constant-flux point source over a uniform …
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Linkages between Eurasian snow cover and Northern Hemisphere winter-time climate variability
… and correlation/regression analysis. The gravity current by the expansion of the cold, dense air over Siberia north- and westward remained one among the several possible mechanisms. The upper air mechanism may be active to connect the ESCSON and the leading mode of DJF surface pressure …
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Bayesian learning for high-dimensional nonlinear dynamical systems : methodologies, numerics and applications to fluid flows
… equations as well as turbulent bottom gravity current dynamics modeled by the 2-D unsteady incompressible Reynolds-averaged Navier-Stokes (RANS) partial differential equations. We compare the accuracy, efficiency, and robustness of different methodologies and algorithms. With the …
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Interface pinning of CO₂ gravity currents
… the relative strength of capillarity relative to gravity, as measured by the inverse of the Bond number. We demonstrate that capillary pressure hysteresis in porous media is caused by the fundamental difference in pore-scale invasion patterns between drainage and imbibition. In addition, we …
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The gravity loading countermeasure skinsuit : a passive countermeasure garment for preventing musculoskeletal deconditioning during long-duration spaceflight
… deconditioning seen in the absence of gravity. Negative changes in bone, muscle, and other physiological systems occur rapidly in space, and have the potential to severely limit the human space exploration program. The deficits in bone are mostly seen in the weight-bearing areas of the …
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Spreading of viscous fluids and granular materials on slopes
Materials can flow down a slope in a wide range of geophysical and industrial contexts, including lava flows on volcanoes and thin films on coated surfaces. The aim of my research is to provide quantitative insight into these forms of motion and their dependence on effects of the topography, the …
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Migration and trapping of CO₂ in saline aquifers
… and traditional reservoir-simulation tools are currently unable to resolve the impact of small-scale trapping processes on these large-scale fluid flows. In this Thesis, we develop a simple gravity-current model for the post-injection migration and trapping of a buoyant plume of CO2 in a …
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Mixing in axisymmetric gravity currents and volcanic conduits
… fluid into axisymmetric high Reynolds number gravity currents. A series of laboratory experiments were conducted in which small scale gravity currents travelled along a wedge shaped channel with an increasing width in the downstream direction. The channel was filled with fresh water and the …
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The fluid mechanics of floating and sinking
… to study the spreading of the resulting gravity current. Initially the current spreads axisymmetrically, while at later times it spreads predominantly along any slope in the overlying cap rock. We show that in industrial settings the time scale over which this asymmetry develops is …
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The kinematics and dynamics of active mountain ranges
… overlying range front, allowing it to act like a gravity current. Local factors, such as weak sediments in the foreland basin, can allow the gravitational force to be dominant even in low elevation ranges like the Zagros. The final chapter builds on these results by modelling a viscous flow over a …
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