Дисертації з теми "Tidal currents Mathematical models"
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Najafi, Hashem Saberi. "Modelling tides in the Persian Gulf using dynamic nesting /." Title page, table of contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phn162.pdf.
Повний текст джерелаCoutis, Peter F. School of Mathematics UNSW. "Currents, coasts and cays : a study of tidal upwelling and island wakes." Awarded by:University of New South Wales. School of Mathematics, 2000. http://handle.unsw.edu.au/1959.4/18207.
Повний текст джерелаDunbar, Donald Stanley 1953. "A numerical model of stratified circulation in a shallow-silled inlet." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25571.
Повний текст джерелаScience, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate
Devlin, Adam Thomas. "On the variability of Pacific Ocean tides at seasonal to decadal time scales| Observed vs modelled." Thesis, Portland State University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10128376.
Повний текст джерелаOcean tides worldwide have exhibited secular changes in the past century, simultaneous with a global secular rise in mean sea level (MSL). The combination of these two factors contributes to higher water levels, and may increase threats to coastal regions and populations over the next century. Equally as important as these long-term changes are the short-term fluctuations in sea levels and tidal properties. These fluctuations may interact to yield locally extreme water level events, especially when combined with storm surge. This study, presented in three parts, examines the relationships between tidal anomalies and MSL anomalies on yearly and monthly timescales, with a goal of diagnosing dynamical factors that may influence the long-term evolution of tides in the Pacific Ocean. Correlations between yearly averaged properties are denoted tidal anomaly trends (TATs), and will be used to explore interannual behavior. Correlations of monthly averaged properties are denoted seasonal tidal anomaly trends (STATs), and are used to examine seasonal behavior. Four tidal constituents are analyzed: the two largest semidiurnal (twice daily) constituents, M2 and S2, and the two largest diurnal (once daily) constituents, K1 and O1.
Part I surveys TATs and STATs at 153 Pacific Ocean tide gauges, and discusses regional patterns within the entire Pacific Ocean. TATs with statistically significant relations between MSL and amplitudes (A-TATs) are seen at 89% of all gauges; 92 gauges for M2, 66 for S2, 82 for K1, and 59 for O1. TATs with statistically significant relations between tidal phase (the relative timing of high water of the tide) and MSL (P-TATs) are observed at 55 gauges for M2, 47 for S2, 42 for K1, and 61 for O1. Significant seasonal variations (STATs) are observed at about a third of all gauges, with the largest concentration in Southeast Asia. The effect of combined A-TATs was also considered. At selected stations, observed tidal sensitivity with MSL was extrapolated forward in time to the predicted sea level in 2100. Results suggest that stations with large positive combined A-TATs produce total water levels that are greater than those predicted by an increase in MSL alone, increasing the chances of high-water events.
Part II examines the mechanisms behind the yearly (TAT) variability in the Western Tropical Pacific Ocean. Significant amplitude TATs are found at more than half of 26 gauges for each of the two strongest tidal constituents, K1 (diurnal) and M2 (semidiurnal). For the lesser constituents analyzed (O1 and S2), significant trends are observed at ten gauges.
Part III analyzes the seasonal behavior of tides (STATs) at twenty tide gauges in the Southeast Asian waters, which exhibit variation by 10 – 30% of mean tidal amplitudes. A barotropic ocean tide model that considers the seasonal effects of MSL, stratification, and geostrophic and Ekman velocity is used to explain the observed seasonal variability in tides due to variations in monsoon-influenced climate forcing, with successful results at about half of all gauges. The observed changes in tides are best explained by the influence of non-tidal velocities (geostrophic and Ekman), though the effect of changing stratification is also an important secondary causative mechanism.
From the results of these surveys and investigations, it is concluded that short-term fluctuations in MSL and tidal properties at multiple time scales may be as important in determining the state of future water levels as the long-term trends. Global explanations for the observed tidal behavior have not been found in this study; however, significant regional explanations are found at the yearly time scale in the Solomon Sea, and at the seasonal time scale in Southeast Asia. It is likely that tidal sensitivity to annual and seasonal variations in MSL at other locations also are driven by locally specific processes, rather than factors with basin-wide coherence. (Abstract shortened by ProQuest.)
Tate, Jennifer N. "Parameter estimation in tidally influenced numerical models determination of an appropriate objective function /." Master's thesis, Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-06252008-082239.
Повний текст джерелаStevens, Malcolm William. "A three-dimensional tidal model for shallow waters using transformations and variably spaced grids." Title page, contents and summary only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09phs845.pdf.
Повний текст джерелаHeger, Walter. "Using the finite difference and the finite element method to solve an electric current diffusion problem." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66150.
Повний текст джерелаBills, Peter John. "Barotropic depth-averaged and three-dimensional tidal programs for shallow seas /." Title page, contents and summary only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phb599.pdf.
Повний текст джерелаJohnson, 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.
Повний текст джерелаMatthews, Karyn. "A spherical coordinate tidal model of the Great Australian Bight using a new coastal boundary representation /." Title page, contents and abstract only, 1995. http://web4.library.adelaide.edu.au/theses/09PH/09phm4391.pdf.
Повний текст джерелаWichers, Sacha. "Verification of numerical models for hydrothermal plume water through field measurements at TAG." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/39173.
Повний текст джерелаIncludes bibliographical references (p. 63-65).
Hydrothermal vents discharge superheated, mineral rich water into our oceans, thereby providing a habitat for exotic chemosynthetic biological communities. Hydrothermal fluids are convected upwards until they cool and reach density equilibrium, at which point they 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 thesis uses field measurements of the velocity, temperature and particulate anomalies associated with the TAG hydrothermal plume to demonstrate that tidal currents exert a strong impact on the plume shape, and to provide new constraints on the thermal power of the TAG hydrothermal system. The results show that the power output of the TAG system is on the order of 6000 MW, which is up to two orders of magnitude greater than previous estimates, and that there is considerably more entrainment than had previously been assumed.
by Sacha Wichers.
S.M.
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.
Повний текст джерелаHudson, Austin Scott. "Applications of Remote Sensing to the Study of Estuarine Physics: Suspended Sediment Dynamics in the Columbia River Estuary." PDXScholar, 2014. https://pdxscholar.library.pdx.edu/open_access_etds/2093.
Повний текст джерелаZhai, Ping Ph D. Massachusetts Institute of Technology. "Buoyancy-driven circulation in the Red Sea." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/95561.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 175-180).
This thesis explores the buoyancy-driven circulation in the Red Sea, using a combination of observations, as well as numerical modeling and analytical method. The first part of the thesis investigates the formation mechanism and spreading of Red Sea Overflow Water (RSOW) in the Red Sea. The preconditions required for open-ocean convection, which is suggested to be the formation mechanism of RSOW, are examined. The RSOW is identified and tracked as a layer with minimum potential vorticity and maximum chlorofluorocarbon-12. The pathway of the RSOW is also explored using numerical simulation. If diffusivity is not considered, the production rate of the RSOW is estimated to be 0.63 Sv using Walin's method. By comparing this 0.63 Sv to the actual RSOW transport at the Strait of Bab el Mandeb, it is implied that the vertical diffusivity is about 3.4 x10-5 m 2 s-1. The second part of the thesis studies buoyancy-forced circulation in an idealized Red Sea. Buoyancy-loss driven circulation in marginal seas is usually dominated by cyclonic boundary currents on f-plane, as suggested by previous observations and numerical modeling. This thesis suggests that by including [beta]-effect and buoyancy loss that increases linearly with latitude, the resultant mean Red Sea circulation consists of an anticyclonic gyre in the south and a cyclonic gyre in the north. In mid-basin, the northward surface flow crosses from the western boundary to the eastern boundary. The observational support is also reviewed. The mechanism that controls the crossover of boundary currents is further explored using an ad hoc analytical model based on PV dynamics. This ad hoc analytical model successfully predicts the crossover latitude of boundary currents. It suggests that the competition between advection of planetary vorticity and buoyancy-loss related term determines the crossover latitude. The third part of the thesis investigates three mechanisms that might account for eddy generation in the Red Sea, by conducting a series of numerical experiments. The three mechanisms are: i) baroclinic instability; ii) meridional structure of surface buoyancy losses; iii) cross-basin wind fields.
by Ping Zhai.
Ph. D.
Link, Shmuel G. "Field measurements of a swell band, shore normal, flux divergence reversal." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/67625.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 55-56).
Throughout this thesis we will discuss the theoretical background and empirical observation of a swell band shore normal flux divergence reversal. Specifically, we will demonstrate the existence and persistence of the energy flux divergence reversal in the nearshore region of Atchafalaya Bay, Gulf of Mexico, across storms during the March through April 2010 deployment. We will show that the swell band offshore component of energy flux is rather insignificant during the periods of interest, and as such we will neglect it during the ensuing analysis. The data presented will verify that the greatest flux divergence reversal is seen with winds from the East to Southeast, which is consistent with theories which suggest shoreward energy flux as well as estuarine sediment transport and resuspension prior to passage of a cold front. Employing the results of theoretical calculations and numerical modeling we will confirm that a plausible explanation for this phenomena can be found in situations where temporally varying wind input may locally balance or overpower bottom induced dissipation, which may also contravene the hypothesis that dissipation need increase shoreward due to nonlinear wave-wave interactions and maturation of the spectrum. Lastly, we will verify that the data presented is consistent with other measures collected during the same deployment in the Atchafalaya Bay during March - April 2010.
by Shmuel G. Link.
S.M.
Trindade, de Oliveira Murilo. "Análise do problema do aterramento em modelos eletrostáticos." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261337.
Повний текст джерелаDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
Made available in DSpace on 2018-08-20T02:16:17Z (GMT). No. of bitstreams: 1 TrindadedeOliveira_Murilo_M.pdf: 8021703 bytes, checksum: 3faa29c4fb8fec84d66f98a7389ed1b5 (MD5) Previous issue date: 2012
Resumo: Nesta dissertação propomos a análise de uma idealização estabelecida dentro da teoria eletromagnética. A partir de Um Tratado sobre Eletricidade e Magnetismo, James C. Maxwell expõe alguns conceitos físicos relativos ao aterramento elétrico em condutores. Assim, ele estima que a presença de um fio condutor que estabelece a conexão entre um corpo condutor e outro, ou mesmo ao terra elétrico, perturba as características do sistema envolvido (carga, potencial e campo elétrico). Desse modo, Maxwell preconiza que para sistemas teóricos ou idealizados, quão indefinidamente fino seja o fio, indefinidamente menor será a perturbação gerada. A contextualização de uma idealização física dentro do ensino da teoria eletromagnética, especialmente para um curso de engenharia, é necessária no intuito de enfatizar as diferenças entre modelos reais e teóricos, uma vez também que os estudantes destes cursos devem estar interessados no desenvolvimento prático dos conceitos apreendidos em sala de aula. Nesse sentido, quando tratamos do método das imagens, especificamente para o problema de uma carga na presença de um condutor esférico aterrado, temos a oportunidade de explorar os limites de um modelo teórico, delimitando quais nuances podem aproximá-lo de uma aplicação no mundo real. Em vista disso, notamos que a maioria dos livros didáticos usados no ensino do eletromagnetismo, quando lidam com o problema do aterramento da esfera, simplesmente negligenciam a questão suscitada por Maxwell, de modo a transformar o problema em um exercício puramente matemático, sem necessidade de explicar os fundamentos físicos que sustentam a solução do problema. Portanto, o intuito do presente trabalho é desenvolver um modelo cuja solução defina o comportamento físico para ambos os casos (levando em consideração ou não a existência da conexão da esfera com o terra elétrico), bem como verificar os limites deste modelo teórico
Abstract: In this work, we propose the analysis about an idealized established within electromagnetic theory. From A Treatise on Electricity and Magnetism, James C. Maxwell presents some physical concepts related to electrical conductors grounded. In this direction, he estimates that the presence of a straight metallic wire which establishes the connection between a conducting body and another, or even to electrical ground, disturbs the properties of the system involved (charge, potential and electric field). Thus, Maxwell preconize for theoretical or idealized systems, how indefinitely thin is the wire, indefinitely lower is the disturbance created. The context of a physical idealization into the teaching of electromagnetic theory, especially for an engineering degree is required in order to emphasize the differences between real and theoretical models, since the students of these courses should be also interested in the practical development of the concepts learned in the classroom. In this sense, when we discussed the method of images, specifically to the problem of a charge point charge in the presence of a grounded conducting sphere, we have the opportunity to explore the limits of a theoretical model, outlining which nuances can approach it to a real world application. In view of this, we note that most of the textbooks used in teaching electromagnetism, when deals with the problem of grounded sphere, they simply neglect the issue raised by Maxwell. In order to transform the problem into a purely mathematical exercise, without to explain the physical foundations that support the solution of the problem. Therefore, the aim of this work is to develop a model whose solution defines the physical behavior for both cases (taking into account or not the existence of a connection of the sphere with the electrical ground), and to verify the limits of this theoretical model
Mestrado
Eletrônica, Microeletrônica e Optoeletrônica
Mestre em Engenharia Elétrica
Li, Hung-Jen, and 李宏仁. "Numerical tidal models and tidal residual currents of Nan-Wan Bay." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/42239629251341756719.
Повний текст джерелаFurnans, Jordan Ernest. "Drifter modeling and error assessment in wind driven currents." Thesis, 2005. http://hdl.handle.net/2152/2422.
Повний текст джерелаWycklendt, Andrew J. "Evaluation of a coastal ocean model for Oahu, Hawaiʻi". Thesis, 2005. http://hdl.handle.net/10125/20781.
Повний текст джерелаHadi, Safwan. "A numerical tidal model of Musi-Upang estuaries." Thesis, 1985. http://hdl.handle.net/10125/10021.
Повний текст джерелаDolasinski, Brian D. "Exploring the feasibility of the detection of neuronal activity evoked by dendrite currents using MRI." 2010. http://liblink.bsu.edu/uhtbin/catkey/1629784.
Повний текст джерелаOverview of the basics of MRI imaging -- Overview of neural activation and imaging of the activation -- Theory and methods -- Results.
Department of Physics and Astronomy
Lakshminarasimhan, Srivatsan. "Study of the flow of and deposition from turbidity currents." Thesis, 2004. http://hdl.handle.net/2152/2059.
Повний текст джерелаMatthews, Karyn. "A spherical coordinate tidal model of the Great Australian Bight using a new coastal boundary representation / Karyn Matthews." Thesis, 1995. http://hdl.handle.net/2440/18639.
Повний текст джерелаKelly, Samuel M. "Tide-topography coupling on a continental slope." Thesis, 2010. http://hdl.handle.net/1957/19917.
Повний текст джерелаGraduation date: 2011
Chen, Nan. "Mechanisms of axis-switching and saddle-back velocity profile in laminar and turbulent rectangular jets." Thesis, 2013. http://hdl.handle.net/1805/4438.
Повний текст джерелаWe numerically investigate the underlying physics of two peculiar phenomena, which are axis-switching and saddle-back velocity profile, in both laminar and turbulent rectangular jets using lattice Boltzmann method (LBM). Previously developed computation protocols based on single-relaxation-time (SRT) and multiple-relaxation-time (MRT) lattice Boltzmann equations are utilized to perform direct numerical simulation (DNS) and large eddy simulation (LES) respectively. In the first study, we systematically study the axis-switching behavior in low aspect-ratio (AR), defined as the ratio of width over height, laminar rectangular jets with
Compton, Andrea Jean. "The correlation of sea surface temperatures, sea level pressure and vertical wind shear with ten tropical cyclones between 1981-2010." Thesis, 2013. http://hdl.handle.net/1805/3669.
Повний текст джерелаSajadian, Sally. "Energy conversion unit with optimized waveform generation." Thesis, 2014. http://hdl.handle.net/1805/6109.
Повний текст джерелаThe substantial increase demand for electrical energy requires high efficient apparatus dealing with energy conversion. Several technologies have been suggested to implement power supplies with higher efficiency, such as multilevel and interleaved converters. This thesis proposes an energy conversion unit with an optimized number of output voltage levels per number of switches nL=nS. The proposed five-level four-switch per phase converter has nL=nS=5/4 which is by far the best relationship among the converters presented in technical literature. A comprehensive literature review on existing five-level converter topologies is done to compare the proposed topology with conventional multilevel converters. The most important characteristics of the proposed configuration are: (i) reduced number of semiconductor devices, while keeping a high number of levels at the output converter side, (ii) only one DC source without any need to balance capacitor voltages, (iii) high efficiency, (iv) there is no dead-time requirement for the converters operation, (v) leg isolation procedure with lower stress for the DC-link capacitor. Single-phase and three-phase version of the proposed converter is presented in this thesis. Details regarding the operation of the configuration and modulation strategy are presented, as well as the comparison between the proposed converter and the conventional ones. Simulated results are presented to validate the theoretical expectations. In addition a fault tolerant converter based on proposed topology for micro-grid systems is presented. A hybrid pulse-width-modulation for the pre-fault operation and transition from the pre-fault to post-fault operation will be discussed. Selected steady-state and transient results are demonstrated to validate the theoretical modeling.