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Dissertations / Theses on the topic 'Ocean currents'

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Published: 4 June 2021

Last updated: 31 July 2024

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1

Tisch, Timothy Daniel. "Seasonal variability of the geostrophic velocity and water mass structure off Point Sur, California." Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA241374.

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Thesis (M.S. in Physical Oceanography)--Naval Postgraduate School, September 1990.
Thesis Advisor(s): Ramp, Steven R. ; Collins, Curtis A. "September 1990." Description based on title screen as viewed on December 21, 2009. DTIC Identifier(s): California Current. Author(s) subject terms: California Current, California Undercurrent, Spiciness Anomaly, Geostrophic Velocity, Water Mass Characteristics. Includes bibliographical references (p. 142-146). Also available in print.

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2

Kuehl, Joseph J. "On the dynamics of oceanic gap-traversing boundary currents /." View online ; access limited to URI, 2009. http://digitalcommons.uri.edu/dissertations/AAI3401123.

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3

Bennett, Sara L. "Where three oceans meet the Algulhas retroflection region /." Woods Hole, Mass. : Woods Hole Oceanographic Institution, 1988. http://catalog.hathitrust.org/api/volumes/oclc/19285078.html.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, 1988.
"Funding was provided by the Office of Naval Research through contract Numbers N00014-84-C-0134, N00014-85-C-0001, and N00014-87-K-0001." "October 1988." Includes bibliographical references (p. 357-367).

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4

Kamenkovich, Igor V. "Radiating instability of nonzonal ocean currents." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/54424.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
Includes bibliographical references (leaves 192-195).
by Igor V. Kamenkovich.
Ph.D.

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5

Kim, Kyung Cheol. "Calibration and validation of high frequency radar for ocean surface current mapping." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FKim.pdf.

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6

Chadwick, David Bartholomew. "Tidal exchange at the bay-ocean boundary /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1997. http://wwwlib.umi.com/cr/ucsd/fullcit?p9823709.

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7

Rana, Haris Sarwar. "Indian Ocean surface circulations and their connection to Indian Ocean dipole, identified from Ocean Surface Currents Analysis Real Time (OSCAR) data." Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://handle.dtic.mil/100.2/ADA483452.

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Thesis (M.S. in Physical Oceanography)--Naval Postgraduate School, June 2008.
Thesis Advisor(s): Chu, Peter C. "June 2008." Description based on title screen as viewed on August 26, 2008. Includes bibliographical references (p. 67-71). Also available in print.

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8

Mohd, Akhir Mohd Fadzil. "Physical processes along the southern continental shelf and slope of Western Australia." University of Western Australia. School of Environmental Systems Engineering, 2010. http://theses.library.uwa.edu.au/adt-WU2010.0118.

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The circulation along the south coast of Western Australia was examined using field data and numerical modelling. Physical processes in this region, particularly along the continental shelf and slope regions, were poorly understood due to a paucity of field measurements. Data were collected during a research cruise on RV Southern Surveyor (04/2006) during April 2006 consisting of 18 CTD transects from Twilight Cove (126oE) to Cape Leeuwin (115oE) and was augmented by shipborne ADCP data. The field data set provided a detailed understanding of three major current systems: Leeuwin Current (LC), Leeuwin Undercurrent (LU) and Flinders Current (FC). The LC along the south coast exhibits different characteristics when compared to that along the west coast. The LC flows into the colder and lower salinity subantarctic environment of the south coast. This is evident in a strong geopotential gradient off the south-west corner of Australia (Cape Leeuwin) resulting in rapid acceleration of the LC as it reaches a maximum velocity in this region. Numerical modelling studies, using the Regional Ocean Modelling System (ROMS) indicated that wind stress is an important component of the dynamics in this region. This was identified when comparing summer and winter conditions when the winds act in opposite directions, from north-westerly to southeasterly respectively. Along the shelf break and slope, the Flinders Current (FC) interacts with LC. As the dominant current, the FC serves both as a surface and as an undercurrent, transporting sub Antarctic mode water (SAMW). This interconnection the FC and LU can be seen clearly from the salinity, temperature and velocities within the depth range 200-700m postulating a connection between subsurface waters off Tasmania (origin of the Flinders Current) and the tropical Indian Ocean through the Flinders and Leeuwin Undercurrents.

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9

Garcez, Faria Antonio Fernando. "Nearshore currents over a barred beach." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA333400.

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Dissertation (Ph.D. in Physical Oceanography) Naval Postgraduate School, June 1997.
Dissertation supervisor, Edward B. Thornton. Includes bibliographical references (p. 149-152). Also available online.

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10

O'Malley, Colleen M. "The fall transition off Central California in 2002." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FOMalley.pdf.

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Thesis (M.S. in Physical Oceanography)--Naval Postgraduate School, June 2003.
Thesis advisor(s): Curtis A. Collins, Mary L. Batteen. Includes bibliographical references (p. 79-80). Also available online.

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11

Whitford, Dennis James. "Wind and wave forcing of longshore currents across a barred beach." Thesis, Monterey, Calif. : Naval Postgraduate School, 1988. http://catalog.hathitrust.org/api/volumes/oclc/52803820.html.

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12

Sánchez, Reales José María. "Studying the ocean geostrophy from space." Doctoral thesis, Universidad de Alicante, 2012. http://hdl.handle.net/10045/25133.

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13

Church, John Casey. "Topics in longshore currents." Thesis, Monterey, Calif. : Naval Postgraduate School, 1993. http://catalog.hathitrust.org/api/volumes/oclc/29749880.html.

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14

Holt, Robert D. "Rip current spacing in relation to wave energetics and directional spreading." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FHolt.pdf.

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Thesis (M.S. in Physical Oceanography)--Naval Postgraduate School, June 2003.
Thesis advisor(s): Edward B. Thornton, Timothy Stanton. Includes bibliographical references (p. 59-62). Also available online.

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15

Chen, Shuiming. "Vertical structure of mesoscale ocean currents in the Indian Ocean observation, numerical modeling and theory /." Thesis, University of Hawaii at Manoa, 2003. http://proquest.umi.com/pqdweb?index=0&did=765960941&SrchMode=2&sid=8&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1209408688&clientId=23440.

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16

Faria, Antonio Fernando Garcez. "A simple quasi-three dimensional model of longshore currents over arbitrary profile." Thesis, [Monterey, Calif. : Naval Postgraduate School], 1995. http://catalog.hathitrust.org/api/volumes/oclc/35646712.html.

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17

Springer, Scott R. "Dynamics of western boundary currents in simple models of low-latitude circulations /." Thesis, Connect to this title online; UW restricted, 1994. http://hdl.handle.net/1773/11010.

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18

Dzwonkowski, Brian. "Surface current analysis of shelf water in the central Mid-Atlantic Bight." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 179 p, 2009. http://proquest.umi.com/pqdweb?did=1697328621&sid=1&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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19

Aguilar, Morales Juan. "Subtidal circulation over the upper slope to the west of Monterey Bay, California /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03sep%5FAguilar.pdf.

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Thesis (M.S. in Meteorology and Physical Oceanography)--Naval Postgraduate School, September 2003.
Thesis advisor(s): Curtis A. Collins, Reginaldo Durazo. Includes bibliographical references (p. 105-108). Also available online.

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20

González, Haro Cristina. "Ocean surface currents reconstruction from microwave radiometers measurements." Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/401548.

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Ocean currents are a key component to understanding many oceanic and climatic phenomena and knowledge of them is crucial for both navigation and operational applications. Therefore, a key problem in oceanography is the estimation of the synoptic velocity field. Currently, global ocean surface velocities are routinely estimated from Sea Surface Height (SSH) measurements provided by altimeters. However, the separation between passes, as well as and the limited number of available altimeters leads to errors in the accurate location of oceanic currents when these measurements are used exclusively. Contrarily, satellite images of Sea Surface Temperature (SST) provide a good qualitative view of the location of ocean patterns, which has encouraged the investigation of alternative methodologies to reconstruct the velocity field based on these observations. This Ph.D. thesis has assessed the capability of SST microwave radiometers observations to retrieve ocean surface currents. The reconstruction of the ocean surface currents from SST observations can be expressed in terms of a transfer function notation, that allows to convert SST maps into SSH, and thus into currents. Because under geostrophic balance, the slope of SSH is proportional to ocean surface currents. This transfer function can be theoretically derived using the Surface Quasi-Geostrophic equations (SQG). Two different approaches were analyzed at a global scale: on one side, the analysis of the validity of the SQG approach has been performed, and on the other, an approach based on the synergetic properties between simultaneous SST and SSH observations has been analyzed. Both approaches have been compared with ocean surface currents retrieved from merged altimetric observations. The study has been focused on the period from October 2002 to May 2005, since during that period there were available four different altimeters, and the quality of the merged altimetric observations was enhanced. The analysis of the validity of SQG at a global scale revealed that this dynamical model is valid near the major extratropic current system such us the Gulf Stream, the Antartic Circumpolar Current, Kuroshio currents. Besides, the potential of MW SST observations to reconstruct ocean surface currents was analyzed using a synergetic approach: the combination of the SST phase with the SSH spectra. Actually, we explored under which environmental conditions the phase of the MW SST is close to the SSH phase. Results showed that the phase of the MW SST can be used to retrieve ocean currents during winter, near the major extratropical current systems, which are characterized by an intense mesoscale activity and the presence of strong thermal gradients, and deep ML. Furthermore, the reconstruction of the velocity fields from an ideal transfer function built up from simultaneous SST and SSH observations revealed that the SQG approach can be enhanced. The spectral properties of this ideal transfer function derived from simultaneous SST and SSH observations were characterized at a global scale. The analysis of spectral properties of the transfer function between SST and SSH observations revealed that despite daily spectral can be flatter or steeper than the k^{-1} predicted by SQG theory, in mean eSQG is a good statistically approach to retrieve ocean currents, when no simultaneous observations of SSH and SST are available.
Las corrientes oceánicas son clave en muchos procesos oceánicos y climáticos, y su conocimiento es crucial para aplicaciones operacionales y de navegación. Por lo tanto, un aspecto importante en oceanografía es la estimación de campos sinópticos del campo de velocidades superficiales del mar. Actualmente, las velocidades superficiales el mar se estiman rutinariamente a partir de medidas del nivel del mar proporcionadas por altimetros, denotadas a partir de ahora con sus siglas en inglés SSH. Sin embargo, la llocalización de las corrientes puede no ser la correcta si solo se utilizan este tipo de medidas para su estimación, debido a la separación entre trazas del satélite. Por contra, las imágenes de temperatura superficial del mar, SST, proporiconan una visión cualitativa de la localización de las estructruas oceánicas. Este hecho ha motivado la investigación de metodologías alternativas para reconstruir los campos de velocidades superficiales del mar basados en estas observaciones. Esta tesis doctoral ha investigado la capacidad de las observaciones de SST proporcionadas por radiometros de microondas para recuperar las corrientes oceánicas superficiales. La reconstrucción de estas velocidades a partir de observaciones de SST se puede expresar en términos de una función de transferencia que relacione las observaciones de SST con las observaciones de SSH. Con lo que la estimación del campo de velocidades es directa, puesto que bajo la condición de equilibrio geostrófico la pendiente de la SSH es proporcional a las corrientes oceánicas. Esta función de transferencia se puede derivar teóricamente mediante las equaciones superficiales cuasi-geotróficas, denotadas con sus siglas en inglés SQG a partir de ahora. Una pregunta clave, es si las ecuaciones de este modelo dinámico son válidas. En esta tesis, se han llevado a cabo dos aproximaciones diferentes para la reconstrucción del campo de velocidades superficiales del mar: por un lado, el análisis de la validez de las ecuaciones SQG, y por otro, una aproximación basada en las propiedades espectrales de medidas simultáneas de SST y SSH. El estudio se ha centrado en el período comprendido entre Octubre del 2002 y Mayo del 2005, puesto que durante este período había disponibles hasta cuatro altmímetros, y consecuentemente la calidad de las observaciones es mayor. El análisis de la validez de SQG a escala global reveló que este modelo dinámico es válido en las regiones cerca de los sistemas de corrientes extratropicales, como la corriente del Golfo, la Corriente Circumpolar Antártica (ACC), o la Kuroshio. Además, el potencial de las observaciones de SST en el rango de las microondas para la recuperación del campo de velocidades superficiales del mar, ha sido analizado utilizando un método que combina la fase de la SST con el espectro de SSH. En realidad, se ha investigado bajo que condiciones la SST y SSH están en fase. Los resultados mostraron que la fase de la SST de microondas puede utilizarse para para la reconstrucción en invierno, cerca de los sistemas de corrientes extratropicales, caracterizados por una intensa actividad de mesoscala y la presencia de fuertes gradientes termales, así como de capas de mezcla profundas. Asimismo, la reconstrucción del campo de velocidades a partir de una función de transferencia ideal, construida a partir de imágenes simultaneas de SST y SSH, reveló que la aproximación SQG puede ser mejorada. Las propiedades espectrales de esta función de tranferencia ideal han sido estudiadas., así como su variabilidad temporal. Este análisis desveló que para escalas pequeñas y zonas enegéticas, la aproximación SQG es una buena aproximación, al menos, desde un punto de vista estádistico.

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21

Sá, Tiago João Cunha. "Potential of incorporating ocean currents in fishing vessels." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/15748.

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Mestrado em Ciências do Mar e das Zonas Costeiras
The fishing sector has been suffering a strong setback, with reduction in fishing stocks and more recently with the reduction of the fishing fleet. One of the most important factors for this decrease, is related to the continuous difficulty to find fish with quality and quantity, allowing the sector work constantly all year long. However other factors are affecting negatively the fishing sector, in particular the huge maintenance costs of the ships and the high diary costs that are necessary for daily work of each vessel. One of the main costs associated with daily work, is the fuel consumption. As an example, one boat with 30 meters working around 17 hours every day, consumes 2500 liters of fuel/day. This value is very high taking into account the productivity of the sector. Supporting this premise was developed a project with the aim of reducing fuel consumption in fishing vessels. The project calls “ShipTrack” and aims the use of forecasts of ocean currents in the routes of the ships. The objective involves the use of ocean currents in favor, and avoiding ocean currents against, taking into account the course of the ship, in order to reduce fuel consumption and increase the ship speed. The methodology used underwent the creation of specific Software, in order to optimize routes, taking into account the forecasts of the ocean currents. These forecasts are performed using numerical modelling, methodology that become more and more important in all communities, because through the modeling, it can be analyzed, verified and predicted important phenomena to all the terrestrial ecosystem. The objective was the creation of Software, however its development was not completed, so it was necessary a new approach in order to verify the influence of the ocean currents in the navigation of the fishing ship "Cruz de Malta". In this new approach, and during the various ship routes it was gathering a constant information about the instant speed, instantaneous fuel consumption, the state of the ocean currents along the course of the ship, among other factors. After 4 sea travels and many routes analyzed, it was possible to verify the influence of the ocean currents in the Ship speed and in fuel consumption. For example, in many stages of the sea travels it was possible to verify an increase in speed in zones where the ocean currents are in favor to the ships movements. This incorporation of new data inside the fishing industry, was seen positively by his players, which encourages new developments in this industry.
O sector pesqueiro tem vindo a sofrer um forte revés, com a redução dos stocks de pesca e mais recentemente com a diminuição da frota de pesca. Um dos principais fatores mais importantes para esta diminuição está relacionado com a contínua dificuldade em encontrar peixe com qualidade e em quantidade, permitindo ao setor trabalhar constantemente durante todo o ano. No entanto, outros fatores estão a afetar negativamente o setor pesqueiro, nomeadamente, os grandes custos de manutenção das embarcações e os elevados custos diários que são necessários para o trabalho de cada embarcação. Um dos principais custos associados ao trabalho diário é o consumo de combustíveis. Como exemplo, uma embarcação com 30 metros de comprimento e que trabalha cerca de 17 horas diárias consome cerca de 2500 litros de combustível por dia, valor muito alto tendo em conta a produtividade do setor. Suportando esta premissa foi desenvolvido um projeto com o objetivo de reduzir o consumo de combustível por parte das embarcações pesqueiras. Este projeto chama-se “ShipTrack”, e tem como finalidade a utilização de previsões de correntes marítimas nas rotas efetuadas pelas embarcações. O objetivo envolve um aproveitamento das correntes a favor e evitar correntes contra, tendo em conta o rumo do barco, de forma a diminuir consumos de combustíveis e aumentar velocidades de navegação. A metodologia utilizada passou pela criação de um Software específico, de forma a otimizar rotas tendo em conta a previsão das correntes oceânicas. Estas previsões são realizadas com recurso à modelação, mecanismo que tem cada vez mais importância em todas as comunidades, pois através da modelação, podemos prever, antecipar e verificar fenómenos importantes para todo o ecossistema terrestre. O objetivo inicial consistia na criação de um Software para o sector pesqueiro, no entanto o seu desenvolvimento não ficou concluído durante a realização deste trabalho. Assim foi necessária uma nova abordagem de forma a verificar a influência das correntes oceânicas na embarcação de pesca “Cruz de Malta”. Nesta nova abordagem, e durante as várias rotas realizadas, foi recolhida constantemente informação sobre a velocidade instantânea, o consumo instantâneo e o estado das correntes oceânicas ao longo do percurso do barco, bem como outros fatores. Após 4 viagens oceânicas e muitas rotas analisadas, foi possível verificar a influência das correntes oceânicas na velocidade do barco e no consumo de combustível. Por exemplo, em muitas fases das várias rotas realizadas, foi possível verificar um aumento da velocidade em zonas onde as correntes oceânicas se encontravam a favor do movimento do barco. A incorporação de novos dados na indústria da pesca foi vista positivamente pelos seus intervenientes, o que encoraja a novos desenvolvimentos nesta indústria.

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22

Brown, Jennifer. "Field measurements and modeling of surfzone currents on inhomogeneous beaches." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 117 p, 2009. http://proquest.umi.com/pqdweb?did=1885467621&sid=6&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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23

Cushanick, Matthew Stephan. "Analysis of nearshore currents near a submarine canyon." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Jun%5FCushanick.pdf.

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Thesis (M.S. in Applied Science (Physical Oceanography))--Naval Postgraduate School, June 2005.
Thesis Advisor(s): Thomas H.C. Herbers. Includes bibliographical references (p. 45). Also available online.

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24

Cuny, Jerome. "Labrador Sea boundary currents /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/10959.

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25

Meuleners, Michael Joseph. "A numerical study of the mesoscale eddy dynamics of the Leeuwin Current system /." Connect to this title, 2005. http://theses.library.uwa.edu.au/adt-WU2007.0134.

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26

Brown, Jeffrey W. "Lagrangian field observations of rip currents." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 133 p, 2008. http://proquest.umi.com/pqdweb?did=1633772921&sid=6&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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27

Johnson, David. "The spatial and temporal variability of nearshore currents." University of Western Australia. Centre for Water Research, 2004. http://theses.library.uwa.edu.au/adt-WU2004.0067.

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The nearshore current field, defined here as the residual horizontal flow after averaging over the incident wave period, exhibits variability at a range of time and space scales. Some of the variable currents are low frequency gravity wave motions. However, variable, rotational (in the sense of possessing vertical vorticity) flow can also exist as part of the overall nearshore current field. A field and numerical modelling investigation of these variable rotational currents has been carried out. Drifters, which were developed for surfzone use, enabled measurement of the nearshore current structure; the design and testing of these new instruments is described. Two sets of field measurements, using the new drifters and Eulerian instruments were carried out for conditions with swell perpendicular to a plane beach and in strong longshore currents. In the perpendicular swell conditions, an interesting and well-defined feature of the measured trajectories was the development of transient rip currents. Discrete vortices were also observed. In the longshore current case, trajectories with the longshore current displacement removed had complex meandering paths. Lagrangian data were used to make estimates of length scales and dispersion, both of which provide strong evidence that the current field cannot be due to low frequency gravity waves alone. Under the assumption of equipartition of kinetic and potential energy for low frequency gravity waves, Eulerian measurements of velocities and pressure show significant energy due to non-divergent, rotational flow in both the perpendicular swell and longshore current case. A numerical model that can simulate horizontal flow with a directionally spread, random wave field incident on a plane beach was implemented. The model developed transient rip currents that are qualitatively very similar to those seen in the drifter trajectories from the field. The number and intensity of rip currents in the model depended on the beach slope and incident wave spectra. The energy content and cross-shore flux (and hence transport of material) of the rotational current flow component in the simulated flow fields is comparable to that due to low frequency gravity waves. The modelling also provided some evidence that there may be universal characteristics of the rotational currents. The field results and modelling show that variable rotational currents are ubiquitous in the field even when longshore currents and hence shear waves are not present. The term “infragravity turbulence” is suggested to describe the general class of nearshore hydrodynamics not directly associated with shear waves, which is largely disorganised, but contains well defined features such as transient rips currents and large scale horizontal vortices. The results have important implications in the understanding of the transport of material, including sediment, biological material, pollution, and sometimes bathers, in the nearshore zone.

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28

Sapp, Brian Keith. "Observations of Laboratory Rip Currents." Thesis, Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10453.

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Laboratory experiments of rip current systems are performed in a wave basin with a bar and rip channel geometry at the Ocean Engineering Laboratory at the University of Delaware. The experiments include both in situ water level and velocity measurements and optical visualization of the flow field under a variety of normal-incident wave conditions. Digital video is used to record surface drifters moving through a rip current system. A method is presented that tracks these digitally-recorded drifters into long Lagrangian sequences. The laboratory measurements capture both an Eulerian and Lagrangian description of the rip current system. Time-averaged rip current properties are calculated and analyzed using both in situ and video measurements. From the video, Lagrangian velocities are computed with forward differencing of the low-pass filtered drifter tracks. Wave properties are also estimated using the orbital drifter motions and linear (Airy) wave theory. The effects of various wave conditions on the time-averaged rip current systems are investigated to show that wave height is a critical parameter. Measurements of circulation cells are obtained by spatially averaging the drifter track velocity measurements into a polar grid ranging from 0.25 m to 3.25 m from the center of the cell. Circulation cell features, such as the center of circulation and cell width, are calculated to characterize their response to various wave conditions. Spectral analyses are used to characterize the rip current pulsations in the experimental measurements. Three frequencies are found to be energetic in several of the experiments in the low frequency band: the wave group frequency, a lower frequency, and the interaction of the wave group and lower frequencies. Some experiments have significant energy at each of the three peaks, where others have only one or none. The lower frequency motions have also been found in the video measurements and attributed to rip meandering. Possible causes for the low-frequency pulsations, including wave basin seiching, circulation cell instabilities, and wave-current interaction, are discussed. This thesis adds to previous rip current studies by providing a spatially-large and time-varying perspective of rip current systems as a whole.

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29

Sheen, Katy Louise. "Seismic oceanography : imaging the antarctic circumpolar current." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609132.

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30

Mitchell, Douglas A. "Upper current structure and variability in the southwestern Japan/East Sea /." View online ; access limited to URI, 2003. http://0-wwwlib.umi.com.helin.uri.edu/dissertations/dlnow/3112121.

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31

Ash, Ellis R. "Rossby waves and mean currents in the Southern Ocean." Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/11542.

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Dynamics in the Southern Ocean are dominated by the Antarctic Circumpolar Current (ACC), and this large eastward current has an important influence on the earth's climate. Output from the last six years of the Fine Resolution Antarctic Model, where the mean flow is known, is used to develop techniques for quantifying Rossby waves and eddy activity. Some eastward jets in the mean flow are found to act as waveguides for Rossby waves. Phase speeds are found to increase linearly with frequency, but do not vary with the strength of mean flow. The reason for this is demonstrated using the dispersion relation, but it is shown that Rossby waves cannot be used to measure mean flows in the ACC without a further understanding of the theory involved. A property of the time-average eddy activity, known as the eddy orientation angle, is shown to indicate the axes of the prominent eastward jets in the mean flow. This shows that eddies are acting to force these jets. Five yeas of measurements from the TOPEX/POSEIDON satellite mission are used to identify Rossby waves in the real ocean. Coherent Rossby wave propagation is again confined to localised regions, some of which act as waveguides. Phase speeds are measured in these regions, and shown to be consistent with previous measurements of Rossby waves. An improved resolution dataset, combining TOPEX/POSEIDON and ERS altimetry measurements, is used to analyse the time-average eddy activity and associated forcing on the mean flow in unprecedented detail. Current data from cruises of the World Ocean Circulation Experiment are used in conjunction with altimetry data to estimate the mean flow at locations along ship tracks. Using these estimates, and the position of temperature fronts as an indication of prominent jets in the mean flow, the eddy forcing is shown to be different to that observed in FRAM. Instead of forcing the mean flow, eddies are being generated within the jets which are likely to be maintained by topographic forcing.

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32

Lo, Hong Kam. "Dynamic ship routing through stochastic, spatially dependent ocean currents /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487759055156018.

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33

Marom, Moshe. "Interferometric SAR imaging of ocean surface currents and wavefields." Thesis, Monterey, Calif. : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA239312.

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Dissertation (Ph.D. in Physical Oceanography)--Naval Postgraduate School, June 1990.
Dissertation supervisor: Thornton, E.B. "June 1990." Description based on title screen as viewed on 19 October 2009. DTIC Identifiers: INSAR (INTERFEROMETRIC SAR). Author(s) subject terms: Interferometric SAR, scene coherence time, 2D wavenumber spectra, surface currents. Includes bibliographical references (p. 192-198). Also available in print.

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34

McWilliams, Brandon K. "Cuspate shoreline morphology." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Jun%5FMcWilliams.pdf.

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Thesis (M.S. in Meteorology and Physical Oceanography)--Naval Postgraduate School, June 2005.
Thesis Advisor(s): Edward Thornton, Timothy Stanton. Includes bibliographical references (p. 53-54). Also available online.

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35

Bobby, Pradeep. "Estimation of vector surface currents beyond the region of overlap of dual-site HF radar : an implementation of the continuity equation /." Internet access available to MUN users only, 2003. http://collections.mun.ca/u?/theses,158623.

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36

Ceballos, Lina Isabel. "North pacific gyre oscillation synchronizes climate fluctuations in the eastern and western boundary systems." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26552.

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Thesis (M. S.)--Earth and Atmospheric Sciences, Georgia Institute of Technology, 2009.
Committee Chair: Di Lorenzo, Emanuele; Committee Member: Bracco, Annalisa; Committee Member: Webster, Peter J.. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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37

Neal, Thomas C. "Analysis of Monterey Bay CODAR-derived surface currents, March to May 1992." Monterey, Calif. : Naval Postgraduate School, 1992. http://catalog.hathitrust.org/api/volumes/oclc/52761036.html.

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38

Woods, John E. "Rip current/cuspate shoreline interactions in Southern Monterey Bay." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Sep%5FWoods.pdf.

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Thesis (M.S. in Meteorology and Physical Oceanography)--Naval Postgraduate School, September 2005.
Thesis Advisor(s):Edward Thornton, Timothy Stanton. Includes bibliographical references (p.41-42). Also available online.

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39

Spence, Luke J. "On the calculation of particle trajectories from sea surface current measurements and their use in satellite sea surface products off the Central California Coast." Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Dec%5FSpence.pdf.

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Thesis (M.S. in Applied Mathematics)--Naval Postgraduate School, December 2007.
Thesis Advisor(s): Giraldo, Francis ; Paduan, Jeffrey. "December 2007." Description based on title screen as viewed on January 18, 2008. Includes bibliographical references (p. 69). Also available in print.

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40

Bean, Mark Shawn. "Modelling the thermohaline circulation." Thesis, University of Southampton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242716.

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Girton, James Bannister. "Dynamics of transport and variability in the Denmark Strait overflow /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/11023.

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Lavender, Kara L. "The general circulation and open-ocean deep convection in the Labrador Sea : a study using subsurface floats /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2001. http://wwwlib.umi.com/cr/ucsd/fullcit?p3035893.

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43

de, Jesus Roland E. "A diagnostic study of the velocity structure of a meandering jet using a primitive equation model with dynamic mode initialization." Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA240687.

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Thesis (M.S. in Meteorology and Physical Oceanography)--Naval Postgraduate School, September 1990.
Thesis Advisor(s): Haney, R. L. ; Stanton, T. P. "September 1990." Description based on title screen viewed on December 17, 2009. DTIC Descriptor(s): Ocean currents, *fronts (oceanography), diagnosis(general), California, transitions, theses, mathematical models, vertical orientation. DTIC Identifier(s): California current, CTZ (California transition zone). Author(s) subject terms: Diagnostic model, California Current, CTZ, dynamical modes. Includes bibliographical references (p. 64-66). Also available in print.

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44

Kennedy, Richard A. "A numerical study of the forcing mechanisms of the Leeuwin current system /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02sep%5FKennedy.pdf.

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Thesis (M.S. in Meteorology and Physical Oceanography)--Naval Postgraduate School, September 2002.
Thesis advisor(s): Mary L. Batteen, Curtis A. Collins. Includes bibliographical references (p. 93-96). Also available online.

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45

Qin, Wenting. "Application of the spectral wave model SWAN in Delaware Bay." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 4.68 Mb., 130 p, 2005. http://proquest.umi.com/pqdlink?did=1037889341&Fmt=7&clientId=8331&RQT=309&VName=PQD.

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46

Ponte, Rui Vasques de Melo. "Observations and modelling of deep equatorial currents in the central Pacific." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/58499.

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Thesis (Ph. D.)--Joint Program in Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 1988.
Includes bibliographical references (leaves 178-180).
Analysis of vertical profiles of absolute horizontal velocity collected in January 1981, February 1982 and April 1982 in the central equatorial Pacific as part of the Pacific Equatorial Ocean Dynamics (PEQUOD) program, revealed two significant narrow band spectral peaks in the zonal velocity records, centered at vertical wavelengths of 560 and 350 stretched meters (sm). Both signals were present in all three cruises, but the 350 sm peak showed a more steady character in amplitude and a higher signal-to-noise ratio. In addition, its vertical scales corresponded to the scales of the conspicuous alternating flows generically called the equatorial deep jets in the past (the same terminology will be used here). Meridional velocity and vertical displacement spectra did not show any such energetic features. Energy in the 560 sm band roughly doubled between January 1981 and April 1982. Time lagged coherence results suggested upward phase propagation at time scales of about 4 years. East-west phase lines computed from zonally lagged coherences, tilted downward towards the west, implying westward phase propagation. Estimates of zonal wavelength (on the order of 10000 km) and period based on these coherence calculations, and the observed energy meridional structure at this vertical wavenumber band, seem consistent, within experimental errors, with the presence of a first meridional mode long Rossby wave packet, weakly modulated in the zonal direction. The equatorial deep jets, identified with the peak centered at 350 sm, are best defined as a finite narrow band process in vertical wavenumber (311-400 sm), accounting for only 20% of the total variance present in the broad band energetic background. At the jets wavenumber band, latitudinal energy scaling compared well with Kelvin wave theoretical values and a general tilt of phase lines downward towards the east yielded estimates of 10000-16000 km for the zonal wavelengths.
by Rui Vasques de Melo Ponte.
Ph.D.

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47

Zelenke, Brian Christopher. "An empirical statistical model relating winds and ocean surface currents : implications for short-term current forecasts." Thesis, Connect to the title online, 2005. http://hdl.handle.net/1957/2166.

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48

Crocker, Roger Ian. "Computing coastal ocean surface currents from infrared and ocean color satellite imagery: Methodology, application, and analysis." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1442910.

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49

Thompson, Scott R. "Displacement of tethered hydro-acoustic modems by uniform horizontal currents." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Dec/09Dec%5FThompson_ME.pdf.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, December 2009.
Thesis Advisor(s): Papoulias, Fotis ; Rice, Joseph. "December 2009." Author(s) subject terms: Acoustic modem, Cable, Steady state, Undersea sensors, Catenary, Mooring. Includes bibliographical references (p. 41). Also available in print.

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50

Taylor, Kelly E. "An investigation of diurnal variability in wind and ocean currents off Huntington Beach, California." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Mar%5FTaylor.pdf.

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Thesis (M.S. in Meteorology and Oceanography)--Naval Postgraduate School, March 2003.
Thesis advisor(s): Leslie K. Rosenfeld, Carlyle H. Wash. Includes bibliographical references (p. 85-86). Also available online.

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