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 17 of 17 for “"Submarine topography"”.
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Internal tide generation by tall ocean ridges
… period generated by tidal currents flowing over submarine topography. Tall ridges that are nominally two-dimensional (2-D) are sites of particularly strong generation. The subsequent dissipation of internal tides contributes to ocean mixing, thereby playing an important role in the circulation of …
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Topographic preconditioning of open ocean deep convection
… Rise in the Weddell Sea indicates that bottom topography may play a role in selecting the location and scale of deep convecting oceanic chimneys below large scale atmospheric negative buoyancy forcing. Topographic preconditioning of open ocean deep convection is studied using an idealized, …
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Internal tide generation by tall ocean ridges
… period generated by tidal currents flowing over submarine topography. Tall ridges that are nominally two-dimensional (2-D) are sites of particularly strong generation. The subsequent dissipation of internal tides contributes to ocean mixing, thereby playing an important role in the circulation of …
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The oceanographic and geoidal components of sea surface topography
Altimetric, gravimetric and oceanographic data over the North Atlantic are combined -using techniques of optimum estimation- to infer the surface expression of the time averaged circulation (ζ) and to estimate the marine geoid (γ), both in the wavelength band 100 km-2000 km. Optimum inverse methods …
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Real time bottom reverberation simulation in deep and shallow ocean environments
Due to the costs involved and time required to perform experiments at sea, it is important to provide accurate simulations of the ocean environment. Using the ray tracing code, BELLHOP, the Mission Oriented Operating Suite (MOOS), methods outlined by the Naval Research Laboratory (NRL) for bottom …
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Two responses of a uniformly stratified flow over a sloping bottom to a spatially varying downwelling favorable wind
The work was motivated by studies of Austin and Lentz (2002) and Pedlosky (2007). The above mentioned works considered two different responses of the stratified flow to a downwelling favorable wind forcing. The first study investigated a time dependent flow with a formation of a constantly …
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Examining the effects of mid ocean ridge topography on 3D marine magnetometric resistivity model responses
… is important to understand the effects of ridge topography on MMR models. To analyze these effects a 3D MMR forward modeling program MMR3D_fwd is used to model Mid Ocean Ridges with varying slopes, resistivities, and source/receiver geometries. The modeled magnetic fields are compared with models …
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The evolution of lithospheric deformation and crustal structure from continental margins to oceanic spreading centers
This thesis investigates the evolution of lithospheric deformation and crustal structure from continental margins to mid-ocean ridges. The first part (Ch. 2) examines the style of segmentation along the U.S. East Coast Margin and investigates the relationship between incipient margin structure and …
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Development of an acoustic vorticity meter to measure shear in ocean-boundary layers
This thesis describes the analysis and development of an acoustic vorticity meter to measure shear in ocean-boundary layers over smaller measurement volumes than previously possible. A nonintrusive measurement of vorticity would filter out irrotational motion such as surface waves and currents that …
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The dynamic role of ridges in a β-plane channel : towards understanding the dynamics of large scale circulation in the Southern Ocean
In this thesis, the dynamic role of bottom topography in a β-plane channel is systematically studied in both linear homogeneous and stratified layer models in the presence of either wind stress (Chapters 2, 3, 4, and 6) or buoyancy forcing (Chapter 5). In these studies, the structure of the …
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The nature and origin of fine-scale sea-floor relief
Bathymetric profiles of mid-ocean ridges show that the morphology of ridge crests and the roughness of sea-floor relief created there is commonly related to the spreading rate. To study the creation of fine-scale sea-floor relief at mid-ocean ridges, detailed bathymetric profiles of mid-ocean …
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Working Up Hills: Dynamics over Sloping Topography with Bottom-Enhanced Diffusion
… occurring near, and likely caused by, rough topography. Though the pieces are all present from this brief description, the exact relationships between them are still unclear, and observations cannot fully be generalized without more direct knowledge of how the phenomena interact. With these …
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Baroclinic vortices over a sloping bottom
Nonlinear quasigeostrophic flows in two layers over a topographic slope are considered. The evolution depends on the size of two parameters which indicate the degree of nonlinearity at depth. The first measures the importance of relative vorticity advection and the second of stretching vorticity. …
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Plio-Pleistocene Drainage Evolution of The Vera Basin, SE Spain
… Basin. Early sedimentation infilled a pronounced submarine topography produced by a rapid laie Miocene fall in sca- level. A broad, shallow shelf platform area existed which opened out to the Pliocene Mediterranean Sea towards the east. Along the northern and western basin margins, wave dominated …
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The influence of topography on steady currents and internal waves
Observations of the ocean in the vicinity of Bermuda on two different occasions show systematic distortions of the isotherms close to the island and an area of intensive mixing on the northern coast. Two mechanisms are investigated and each produces some agreement with data from different flow …
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Studies of deep-sea sedimentary microtopography in the North Atlantic Ocean
… irregularities on the sea floor, such as submarine canyons, or by instabilities in the flow of deep, contour-following currents. Sediment waves develop where there is an abundant supply of sediment and steady mean currents. Waves appear to migrate upstream where tidal current fluctuations …
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A qualitative and quantitative study of the distribution of pelagic sediment in the Atlantic Basin
Pelagic sedimentation is the primary modifier of topography generated by ridge-associated volcanic and tectonic processes. This thesis represents an effort to understand the processes of, and the general distribution of, pelagic sedimentation on rough topography, particularly in the Atlantic Basin …