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Dissertations / Theses on the topic 'Barotropic models'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Bills, 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.

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2

Metz, Werner. "Linear barotropic simulation of atmospheric low-frequency variability." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-212307.

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A steady-state barotropic model, linearized about a GCM-derived 500 hPa basic state, is driven by a sample of \"observed\" forcing fields. lt tums out that the leading mode (LEOF) obtained from the sample of linear solutions matches weil with the leading EOF of low-frequency atmospheric variability actually occurring in the GCM. The response ofthe linear model is analysed in tenns of the singular modes of the model\'s linear operator. lt is found that about 50 percent ofthe spatial variance of the LEOF can be explained in tenns of the leading two singular modes. This finding is reflected also

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3

Metz, Werner. "Linear barotropic simulation of atmospheric low-frequency variability." Universität Leipzig, 1995. https://ul.qucosa.de/id/qucosa%3A15014.

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A steady-state barotropic model, linearized about a GCM-derived 500 hPa basic state, is driven by a sample of \'observed\' forcing fields. lt tums out that the leading mode (LEOF) obtained from the sample of linear solutions matches weil with the leading EOF of low-frequency atmospheric variability actually occurring in the GCM. The response ofthe linear model is analysed in tenns of the singular modes of the model\''s linear operator. lt is found that about 50 percent ofthe spatial variance of the LEOF can be explained in tenns of the leading two singular modes. This finding is reflected also

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4

Kiss, Andrew Elek, and Andrew Kiss@anu edu au. "Dynamics of laboratory models of the wind-driven ocean circulation." The Australian National University. Research School of Earth Sciences, 2001. http://thesis.anu.edu.au./public/adt-ANU20011018.115707.

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This thesis presents a numerical exploration of the dynamics governing rotating flow driven by a surface stress in the " sliced cylinder " model of Pedlosky & Greenspan (1967) and Beardsley (1969), and its close relative, the " sliced cone " model introduced by Griffiths & Veronis (1997). The sliced cylinder model simulates the barotropic wind-driven circulation in a circular basin with vertical sidewalls, using a depth gradient to mimic the effects of a gradient in Coriolis parameter. In the sliced cone the vertical sidewalls are replaced by an azimuthally uniform slope around the

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5

Wu, Peili. "On linear structures and persistent anomalies in the atmosphere." Thesis, University of London, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301916.

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6

Ling, Alister R. "Blocking-like flows in a hemispherical barotropic model." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65945.

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7

Le, Roux Daniel Y. "A semi-Lagrangian finite element barotropic ocean model." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ44492.pdf.

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8

Bilodeau, Bernard. "Accuracy of a truncated barotropic spectral model : numerical versus analytical solutions." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66037.

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9

Petroliagis, Thomas I. "Studies of barotropic flow over topography using a Galerkin Finite Element model." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23411.

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A finite element shallow-water model is tested with two types of surface topography. The model uses rectangular subdivisions in a vorticity-divergence formulation, and a semi-implicit time discretization. In the first experiment an east-west ridge or valley is placed in a channel with east-west periodic conditions. Linear quasi-geostrophic solutions are derived with the rigid lid assumption. The Rossby waves are successfully simulated in the model with linear solutions as the initial conditions. The model phase speeds are very close to the analytic values when the latter are properly corrected

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10

Gravel, Sylvie. "Periodic and stationary solutions to a forced-dissipated barotropic model of the atmosphere." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75937.

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Using a barotropic model, some aspects of the theory of multiple equilibria were investigated, namely, the genesis of multiple equilibria via bent resonance, and the properties of some of the linearly unstable low index solutions.<br>These studies were conducted using numerical models with a truncated spectral representation of the dependent variables, truncation that was determined in terms of its capacity to allow for nonlinear interactions. By means of a continuation algorithm, the stationary solutions of the potential vorticity equation were calculated for a number of regions of parameter

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11

Velissariou, Vasilia. "Examination of the Barotropic Behavior of the Princeton Coastal Ocean Model in Lake Erie, Using Water Elevations From Gage Stations and Topex/Poseidon Altimeters." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1252401353.

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12

Flexas, Sbert Maria del Mar. "Mesoscale variability of the northern current in the gulf of lions and the role of bottom topography." Doctoral thesis, Universitat Politècnica de Catalunya, 2003. http://hdl.handle.net/10803/6386.

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The Northern Current flows cyclonically contouring the continental slope in the NW Mediterranean. At the entrance of the Gulf of Lions this current is about 20 -- 30 km wide and flows along the deepest half of the continental slope, i.e. over the 1000 to 2000 m isobaths approximately. Surface speeds are of 30 -- 50 cm s^{-1}. In the MATER HFF experiment (March -- May 1997) mesoscale variability of the Northern Current is observed from current meter records, SST images and hydrographic data. The HFF experimental box is 20 x 40 km, covering the upper half of the slope (i.e. covering from 250 m t

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13

Demange, Jérémie. "Schémas numériques d'advection et de propagation d'ondes de gravité dans les modèles de circulation océanique." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENM096/document.

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Les modèles numériques d'océans régionaux tridimensionnels sont basés sur la résolution des équations primitives et utilisent pour la plupart des méthodes de résolution eulérienne de type différences finies sur des grilles décalées. Ces modèles doivent représenter fidèlement les transports et transferts d'énergie. L'amélioration de ces modèles numériques exige donc (i) l'identification des processus prépondérants, notamment en terme de dissipation, dans ces transferts et (ii) la construction de méthodes numériques respectant un certain nombre d'équilibres. La première partie du travail se conc

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14

Le, Corre Mathieu. "Impact de la topographie et de l'activité méso-échelle sur la dynamique de gyre subpolaire Nord Atlantique Barotropic vorticity balance of the North Atlantic subpolar gyre in an eddy-resolving model, in Ocean Science 16(2), April 2020." Thesis, Brest, 2020. http://www.theses.fr/2020BRES0021.

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Le gyre subpolaire Nord Atlantique est une région cruciale pour l’océan et le climat. La circulation dans cette région est complexe et fortement influencée par la topographie. Jusqu’à présent la dynamique a été étudiée principalement dans des modèles basses résolutions ne résolvant que peu l’activité fine échelle ainsi qu’avec une représentation grossière de la topographie. Ici nous revisitons la dynamique du gyre subpolaire Nord Atlantique dans une simulation haute résolution avec des coordonnées verticales suivant la topographie. Cela permet de représenter de manière plus réaliste l’activité

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15

Ayina, Ludos-Hervé. "Etude des modes de variabilité de l'océan Atlantique tropical et de leur sensibilité à l'impact des décharges fluviatiles et des précipitations." Paris 6, 2002. http://www.theses.fr/2002PA066019.

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16

Bessières, Laurent. "Impact des marées sur la circulation générale océanique dans une perspective climatique." Phd thesis, Université Paul Sabatier - Toulouse III, 2007. http://tel.archives-ouvertes.fr/tel-00172154.

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La marée océanique a longtemps été considérée comme un phénomène haute fréquence dont la zone d'influence se limitait aux plateaux continentaux. Ainsi, la marée n'apparaissait pas susceptible d'interagir sur la circulation océanique grande échelle et in fine sur la dynamique basse fréquence du climat. Ce n'est qu'à la fin des années 1990, lorsque la mesure altimétrique et les solutions hydrodynamiques globales de marées ont atteint une précision centimétrique, qu'une connexion entre les marées et le climat est devenue envisageable. Dans cette perspective, l'objectif de cette étude est d'explor

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17

Tobis, Michael. "Effect of slowed barotropic dynamics in parallel ocean climate circulation models." 1996. http://catalog.hathitrust.org/api/volumes/oclc/34938434.html.

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18

Einšpigel, David. "Barotropní oceánický slapový model." Master's thesis, 2012. http://www.nusl.cz/ntk/nusl-304111.

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Title: Barotropic ocean tide model Author: David Einšpigel Department: Department of Geophysics Supervisor: prof. RNDr. Zdeněk Martinec, DrSc., Department of Geophysics Abstract: The main aim of this thesis is developing of a numerical model of an oceanic circulation forced by the lunisolar tidal potential. The circulation is described by the shallow water equations which are derived from the fundamental balance laws assuming that the ratio of the vertical and horizontal dimension of the investigated problem is small, which leads to the formulation of the 2- D task. Furthermore, programs for s

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19

Bailey, David A. "Adjoint data assimilation in an open ocean barotropic quasi-geostrophic model." Thesis, 1993. http://hdl.handle.net/2429/2271.

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A barotropic quasi-geostrophic ocean model with open boundaries was used to model a system of mid-ocean eddies. A simplified adjoint assimilation scheme was tested to see if sparse velocity data could be assimilated into the model at regular intervals. In between the times for data assimilation, the model was integrated forward in time with an Orlanski radiating boundary condition. This assimilation scheme was tested with several model runs, illustrating the changes arising from using different eddy sizes, different density of available data, and different numerical model parameters. This sche

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20

Hyungeun, Shin. "Effect of equatorially trapped waves on the tropical cyclone drift." Thesis, 2019. http://hdl.handle.net/1828/11211.

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The movement of tropical cyclones (TC) is studied numerically based on a two-dimensional barotropic model, using a previously developed non-oscillatory balanced scheme. The model of TC used here takes an exponential form, and its size and strength are selected to be of a middle scale. Without a background flow, TCs move in the northwest direction due to the beta effect. The amplitudes of high wavenumber modes of the asymmetric flow, that are believed to be responsible for the TC drift, are computed using Fourier analysis. The amplitude of wavenumber one and two modes are dominant, so they are

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21

Lu, Youyu. "A fine-resolution barotropic model of the North Atlantic driven by wind and atmospheric pressure forcing /." 1994. http://collections.mun.ca/u?/theses,67911.

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22

Lawrence, Wendy B. "Measurements of a barotropic planetary vorticity mode in an eddy-resolving quasi-geostrophic model using acoustic tomography." Thesis, 1988. http://hdl.handle.net/10945/23299.

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23

Dunphy, Michael. "The Influence of Mesoscale Eddies on the Internal Tide." Thesis, 2009. http://hdl.handle.net/10012/4575.

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The barotropic tide dissipates a well established estimate of 2.5 TW of energy at the M2 frequency. Bottom topography is responsible for part of this dissipation, and the generation of the internal tide is also partly responsible. The fate of this energy is largely described by a cascade from large scales to small scales by non-linear wave-wave interactions where it gets dissipated. This thesis aims to investigate how the presence of mesoscale eddies (vortices) in the ocean affect the internal tide. Previous work has looked at the interaction of the barotropic tide with eddies. Krauss (19

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