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Dissertations / Theses on the topic 'Spectral Wave Modelling'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Adam, Alexandros. "Finite element, adaptive spectral wave modelling." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/45307.

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The ability to predict the wave climate has a great impact on a wide range of sectors, including coastal and offshore engineering, marine renewable energy and shipping. The state of the art in wave prediction is called spectral wave modelling and is based on a phase-averaged, spectral description of the sea-surface elevation. The governing equation, called the action balance equation, is five-dimensional and describes the generation, propagation and evolution of action density in geographic space, spectral space and time. Due to the multidimensional nature of the equation the feasible resoluti

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2

Lavidas, George. "Wave energy resource modelling and energy pattern identification using a spectral wave model." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/25506.

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The benefits of the Oceans and Seas have been exploited by societies for many centuries; the marine offshore and naval sectors have been the predominant users of the waters. It has been overlooked until recently, that significant amounts of energy can be harnessed by waves, providing an additional abundant resource for renewable energy generation. The increasing energy needs of current societies have led to the consideration of waves as an exploitable renewable resource. During the past decades, advancements have been made towards commercialising wave energy converters (WECs), though significa

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3

Karpfinger, Florian. "Modelling borehole wave signatures in elastic and poroelastic media with spectral method." Thesis, Curtin University, 2009. http://hdl.handle.net/20.500.11937/2447.

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Borehole sonic measurements are an important tool to characterize formation and completion properties of hydrocarbon or water reservoirs. Such measurements can provide direct information about rock physical parameters such as permeability or elastic moduli. These properties are obtained from guided waves propagating along boreholes. The so called tube wave or Stoneley wave is a symmetric mode which compresses the fluid column leading to a piston like motion. If the medium around the borehole wall is permeable, the radial expansion of the fluid column will result in fluid flow across the boreho

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4

Holmbom, Joakim. "Modelling of Waves and Currents in the Baltic Sea." Thesis, KTH, Vattendragsteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96232.

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To facilitate the process of setting up small scale environmental models in coastal and offshore areas a wave model and a 2D current model for the Baltic Sea have been set up with MIKE 21. The ambition is that the Baltic Sea model can serve as a source of boundary conditions for local models. The main focus in the project has been to determine which input data to use to get the best results and then to calibrate and validate the model with the best data sets available. The wave model has been tested with three different sources of wind forcing and the results with the different sources are eva

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5

Fang, Kangan. "Pseudo-spectral modelling of cracked anisotropic media and rotation of multicomponent shear-wave data." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ38582.pdf.

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6

Thomas, Gregory Robert. "A combined high-order spectral and boundary integral equation method for modelling wave interactions with submerged bodies." Thesis, Monterey, California. Naval Postgraduate School, 1996. http://hdl.handle.net/10945/8098.

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7

Thomas, Gregory Robert. "A combined high-order spectral and boundary integral equation method for modelling wave interactions with submerged bodies." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/17432.

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8

Baykal, Cuneyt. "Two-dimensional Depth-averaged Beach Evolution Modelling." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614148/index.pdf.

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In this study, a two-dimensional depth-averaged beach evolution numerical model is developed to study the medium and long term nearshore sea bottom evolution due to non-cohesive sediment transport under the action of wind waves only over the arbitrary land and sea topographies around existing coastal structures and formations. The developed beach evolution numerical model is composed of four sub-models: a nearshore spectral wave transformation model based on energy balance equation including random wave breaking and diffraction terms to compute the nearshore wave characteristics, a nearshore w

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9

Alias, Azwani B. "Mathematical modelling of nonlinear internal waves in a rotating fluid." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/15861.

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Large amplitude internal solitary waves in the coastal ocean are commonly modelled with the Korteweg-de Vries (KdV) equation or a closely related evolution equation. The characteristic feature of these models is the solitary wave solution, and it is well documented that these provide the basic paradigm for the interpretation of oceanic observations. However, often internal waves in the ocean survive for several inertial periods, and in that case, the KdV equation is supplemented with a linear non-local term representing the effects of background rotation, commonly called the Ostrovsky equation

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10

Schulte, Rolf T. [Verfasser]. "Modellierung und Simulation von wellenbasierten Structural-Health-Monitoring-Systemen mit der Spektral-Elemente-Methode. Modelling and simulation of wave-based structural health monitoring-systems using the spectral element method / Rolf T. Schulte." Siegen : Universitätsbibliothek Siegen, 2011. http://d-nb.info/1010297430/34.

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11

Laugel, Amélie. "Climatologie des états de mer en Atlantique nord-est : analyse du climat actuelet des évolutions futures sous scénarios de changement climatique par descente d'échelle dynamique et statistique." Phd thesis, Université Paris-Est, 2013. http://tel.archives-ouvertes.fr/tel-00966849.

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L'analyse de la climatologie des aléas océano-météorologiques tels que les états de mer est fondamentale pour comprendre l'évolution et la dynamique des zones côtières, estimer les risques naturels survenant lors d'événements de tempête majeurs, définir les moyens optimaux de protection des ports et infrastructures onshore et offshore, caractériser la ressource houlomotrice pour des projets de récupération d'énergie des vagues, comprendre les processus d'érosion et accrétion des plages, etc. Pour répondre à ces problématiques dans un contexte de questionnement croissant sur les conséquences po

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12

El, khoury Christine. "Seismic ambient noise amplitude anomalies induced by an anticline structure : application to the context of gas reservoirs." Electronic Thesis or Diss., Université Paris sciences et lettres, 2022. http://www.theses.fr/2022UPSLM100.

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Des anomalies spectrales dans le bruit sismique ambiant, définies comme de fortes amplifications spectrales de la composante verticale pour des fréquences de 1 à 5 Hz, sont couramment observées au droit de réservoirs de gaz. Si elles sont bien comprises, ces anomalies pourraient avoir un potentiel pour l'exploration ou la surveillance des réservoirs de fluides. La nature de ces anomalies s'explique principalement par la structure géologique plutôt que par le réservoir lui-même, pour une modélisation purement élastique. L'analyse sur des jeux de données réels de bruit ambiant montre que les ond

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13

Davies, Gaynor Margaret. "Long cycles : with particular reference to Kondratieffs." Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319160.

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14

Li, Wei. "Numerical Modelling and Statistical Analysis of Ocean Wave Energy Converters and Wave Climates." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-305870.

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Ocean wave energy is considered to be one of the important potential renewable energy resources for sustainable development. Various wave energy converter technologies have been proposed to harvest the energy from ocean waves. This thesis is based on the linear generator wave energy converter developed at Uppsala University. The research in this thesis focuses on the foundation optimization and the power absorption optimization of the wave energy converters and on the wave climate modelling at the Lysekil wave converter test site. The foundation optimization study of the gravity-based foundati

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15

Jamet, Guillaume. "Modélisation d'ondes sismo-acoustiques par la méthode des éléments spectraux : application à un séisme en Atlantique Nord." Thesis, Brest, 2014. http://www.theses.fr/2014BRES0030/document.

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Depuis plus de deux décennies, I'enregistrement des signaux hydroacoustiques par des hydrophones dans le canal SOFAR (SOund Fixing And Ranging) a permis la détection et la localisation de nombreux séismes de faible magnitude dans I'océan. Cependant, I'interprétation de ces signaux est actuellement incomplète. La complexité de la conversion des ondes sismiques en ondes acoustiques, appelées « ondes T », au niveau du plancher océanique, et de leur propagation dans la tranche d'eau n'est pas intégralement comprise et ne permet pas d'extraire beaucoup d'informations sur les séismes à leur origine.

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16

Leckler, Fabien. "Observation et modélisation du déferlement des vagues." Thesis, Brest, 2013. http://www.theses.fr/2013BRES0079/document.

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Les récentes paramétrisations utilisées dans les modèles spectraux de vagues offrent des résultats intéressants en termes de prévision et rejeux des états de mer. Cependant, de nombreux phénomènes physiques présents dans ces modèles sont encore mal compris et donc mal modélisés, notamment le terme de dissipation lié au déferlement des vagues.Le travail présenté dans cette thèse vise dans un premier temps à analyser et critiquer les paramétrisations existantes de la dissipation, au travers de la modélisation explicite des propriétés du déferlement sous-jacentes. Du constat de l’échec de ces par

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17

Martire, Léo. "Characterisation of Infrasound in the Coupled Solid-Atmosphere System : Numerical Modelling, Terrestrial and Planetary Applications." Thesis, Toulouse, ISAE, 2020. http://www.theses.fr/2020ESAE0028.

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Cette thèse porte sur le couplage mécanique entre le corps solide d’une planèteet son atmosphère. Nous étudions les événements géophysiques naturels et anthropiquesgrâce aux ondes sismiques et infrasonores. Ces phénomènes sont clés pour découvrir lastructure atmosphérique de la Terre, l’intérieur de Vénus, et Mars dans son intégralité.Les formes d’ondes acoustiques et sismiques contiennent des informations importantes, à lafois sur l’événement source et sur le milieu de propagation. L’objet de ce travail est double.Premièrement, nous développons un logiciel de simulation numérique pour le syst

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18

Papatsoris, Anastassios Dimitriou. "Improvements to the modelling of radiowave propagation at millimetre wavelengths : in-depth studies are reported on resonance phenomena in the scattering of spherical ice particles, extinction and backscattering properties of clouds and on the absorption and dispersion spectra of atmospheric gases." Thesis, University of Bradford, 1993. http://hdl.handle.net/10454/4213.

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Various physical mechanisms that affect radiowave propagation at millimetre wavelengths are considered. Current modelling weaknesses are highlighted and new improved models or more appropriate modelling approaches are suggested. Interference and resonance phenomena in the scattering of spherical ice and water particles are reviewed. The long standing problem of the numerous resonances observed in the scattering diagrams of dielectric spheres is answered. The spatial structure and the physical characteristics of non-precipitable ice and water clouds are reviewed. Extinction and back scattering

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19

Zebiri, Boubakr. "Étude numérique des interactions onde de choc / couche limite dans les tuyères propulsives Shock-induced flow separation in an overexpanded supersonic planar nozzle A parallel high-order compressible flows solver with domain decomposition method in the generalized curvilinear coordinates system Analysis of shock-wave unsteadiness in conical supersonic nozzles." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMIR06.

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La nécessité d’une meilleure compréhension du mécanisme d’entrainement pour l’instabilité à basse fréquence observée dans un écoulement dans une tuyère sur-détendue a été discutée. Le caractère instable de l’onde de choc/couche limite reste un défi pratique important pour les problèmes des écoulements dans les tuyères. De plus, pour une couche limite turbulente incidente donnée, ce type d’écoulement présente généralement des mouvements de choc à basse fréquence plus élevées qui sont moins couplés aux échelles de temps de la turbulence en amont. Cela peut être bon du point de vue d’un expérimen

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20

BHOWMICK, TARAPRASAD. "A numerical investigation of a few problems in cloud microphysics." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2868592.

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21

Sinclair, Catherine Ellen. "Elastic wave modelling in anisotropic media using the spectral-element method." Thesis, 2010. http://hdl.handle.net/2440/59434.

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Forward modelling of seismic waves is an essential tool in the determination of the underlying structure of the Earth using inversion techniques. Despite recent advances in computer power and memory resources, full 3-D elastic wave modelling continues to place a heavy burden on a typical personal computer. 2.5-D modelling reduces the computational burden while maintaining 3-D wavefield characteristics. In this thesis I present 2.5-D frequency-domain equations of motion for elastic wave modelling in anisotropic media. The reduced set of equations for vertical transversely isotropic media and t

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22

Sinclair, Catherine Ellen. "Elastic wave modelling in anisotropic media using the spectral-element method." 2010. http://hdl.handle.net/2440/59434.

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Forward modelling of seismic waves is an essential tool in the determination of the underlying structure of the Earth using inversion techniques. Despite recent advances in computer power and memory resources, full 3-D elastic wave modelling continues to place a heavy burden on a typical personal computer. 2.5-D modelling reduces the computational burden while maintaining 3-D wavefield characteristics. In this thesis I present 2.5-D frequency-domain equations of motion for elastic wave modelling in anisotropic media. The reduced set of equations for vertical transversely isotropic media and ti

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23

He, Shuai. "Spectral finite element modelling and damage identification of beam-like structures using linear and nonlinear guided waves." Thesis, 2017. http://hdl.handle.net/2440/109804.

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This thesis contains a series of journal papers focused on the development of the model-based approach for damage identification using guided waves. The proposed approach requires no baseline data. It can identify multiple damages such as characterising the number, location and the size of cracks in isotropic beams and delaminations in composite beams efficiently and accurately with quantifying the associated uncertainties using linear guided waves. It also investigate the plausibility of using the nonlinear guided wave for damage identification. Based on the modelling ability, this approach i

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