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 18 of 18 for “"Linear Wave Theory"”.
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Non-migrating tides in the Martian thermosphere
… to non-migrating tides is dominated by wavenumber 2 and wavenumber 3 harmonics during the periods studied. Comparison with the Neutral Ion and Gas Mass spectrometer (NGIMS) shows a good agreement in wave amplitudes observed for the first two cases studied. The temperatures and 𝑂/𝐶𝑂# …
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Studies of ICRF mode conversion with phase contrast imaging and full-wave simulations in Alcator C-Mod
Radio frequency (rf) waves in the ion cyclotron range of frequencies (ICRF) are widely used for heating fusion plasmas. In a multi-ion-species plasma, the launched fast waves convert to ion cyclotron waves and ion Bernstein waves in the vicinity of the two-ion hybrid resonance between the cyclotron …
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Dynamic response analysis of spar buoy floating wind turbine systems
… is being defined as a limiting case, and a linear wave theory has been the most fundamental theory applied for the present analysis.
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Sea surface wave reconstruction from marine radar images
… being increasingly used to measure sea surface waves nowadays. In this thesis, how to reconstruct sea surface wave elevation maps from X-band marine radar images and do wave field prediction over short term in real time are discussed. The key idea of reconstruction is using dispersion relation …
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Dynamics of Pitching Wave Energy Converter with Resonant U-Tank Power Extraction Device
… and theoretical validation of a new type of wave energy converter (WEC), comprising a pitching floater integrated with a resonant U-tank (RUT) and a Wells turbine as power take-off (PTO). Theoretical formulation of a fully coupled multi-body dynamic system, incorporating the thermodynamic …
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Generation of Very Long Waves in Laboratory for Tsunamis Research
… of tsunamis which point out that use of solitary waves as model tsunami is not theoretically justified. In order to generate very long waves in laboratory, a bottom-tilting wave maker is designed and used at the University of Dundee. This new type of wave maker can produce waves longer than the …
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Some aspects of the analysis of offshore structures
… thesis, a study is made of the effect of random wave forces on self-supporting steel and concrete oil drilling platforms. Various methods of estimating the forces on the structure, and various ways of idealising both the forces and the structure itself, are compared, the - objective being a …
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A global map of tidal dissipation over abyssal hills
Internal gravity waves are complex 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 …
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STUDIES OF DYNAMIC RESPONSE OF OFFSHORE GUYED TOWERS
… response of a realistic guyed-tower structure to wave-induced excitations. The tower is modeled as a cantilever, discrete, stick-like system, and due consideration is given in the analysis to the nonlinear behavior of the guylines and foundation. The wave forces are defined by Morison's equation …
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WEAKLY NONLINEAR DYNAMIC ANALYSIS OF FLOATING BODIES IN WAVES
Weakly nonlinear dynamic responses of rectangular floating bodies are studied in this work. This study is based on a modified linear wave theory that gives a reasonable Froude-Krylov pressure distribution near the free surface. The idea of strip theory is then adopted to evaluate the Froude-Krylov …
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Wave induced response of sea floor deposits : a simple model for sands and nonlinear analysis by FEM
This dissertation analyzes the ocean wave-induced response of seafloor deposits. The linear wave theory is introduced for determination of the wave-induced pressure at the mud line. The seafloor deposit is assumed to be a saturated porous medium modelled by a two-phase system. The theory of mixture …
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Shore-parallel sediment transport by waves and tides in inner shelf waters
In shallow waters the combined action of waves and currents significantly affects the motion of sediment on the bottom, and hence the nature and phase of their interactions with each other contribute to the shaping of the beach. Using pressure and velocity data collected just outside the surfzone …
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The vertical structure of stratospheric planetary waves and its variability : theory and observations
… vertical structure of stratospheric planetary waves reveal a large variety of structures, and a variability both on seasonal and on daily time scales. The extent to which linear wave theory explains these structures and their time evolution at a given time or season is not well known. The …
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On the interaction of ocean waves and turbulence
The interaction of ocean waves and turbulence is a fundamental process in the ocean. Understanding and prediction of wind-wave generation, propagation, breaking, non-linear interactions and extreme wave development are directly linked to this complex and not well understood phenomenon (Thorpe …
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Part I: Geostatistical Interpolation of Rain Fields Using Radar Estimates and Gauge Observations: Algorithm Design and Automation; Part II: Energy Dissipation in Fluid Flows and Wave Transformation by Porous Barriers and Submerged Cavities
… by fluids passing through porous screens and the wave transformation caused by porous barriers as well as submerged cavities. In the first part of the study, the regression-kriging (RK) and merging spatial interpolation techniques were applied to predict rain fields using radar rainfall estimates …
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Link Stability Analysis of Wireless Sensor Networks Over the Ocean Surface
… we investigate and capture the effects of ocean waves on the link stability through the following steps. First, we use the linear wave theory and obtain a novel stochastic model of Line-of-Sight (LoS) links over the ocean based on the realistic behavior of ocean waves. Second, we present and …
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A study of breakwater gap wave diffraction using close range photogrammetry and finite and infinite elements.
In this thesis the diffraction of water waves passing through a gap in a breakwater is investigated experimentally, using close range photogrammetry, and numerically, using finite and infinite elements. The author was particularly interested in validating specific breakwater gap diffraction …
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Wave impacts on rectangular structures
… uncertainty and sensitivity in the results for wave impact. In a practical situation, many parameters such as the wave climate will not be known with any accuracy especially the frequency and severity of wave breaking. Even if the wave spectrum is known, this is usually recorded offshore, …