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Dissertations / Theses on the topic 'Stable boundary'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Burgess, N. A. "Stable boundary conditions for the shallow water equations." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380000.

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2

Holden, John Joseph. "Stable boundary layer flow over hills and valleys." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299300.

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3

Carden, Giles A. F. "Stable isotopic changes across the Ordovician-Silurian boundary." Thesis, University of Liverpool, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260327.

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4

Arduini, Gabriele. "Wintertime stable boundary-layer processes in Alpine valleys." Thesis, University of Hertfordshire, 2017. http://hdl.handle.net/2299/19706.

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Alpine valleys are rarely closed systems, implying that the atmospheric boundary layer of a particular valley section is influenced by the surrounding terrain and large-scale flows. A detailed characterisation and quantification of these effects is required in order to design appropriate parameterisation schemes for complex terrains. The focus of this work is to improve the understanding of the effects of surrounding terrain (plains, valleys or tributaries) on the heat and mass budgets of the stable boundary layer of a valley section, under dry and weak large-scale wind conditions. Numerical s

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5

Barnard, James Coles. "Intermittent turbulence in the very stable Ekman layer /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/7048.

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6

Walesby, Kieran Tristan. "Parameterizing the Antarctic stable boundary layer : synthesising models and observations." Thesis, University of Exeter, 2013. http://hdl.handle.net/10871/11261.

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The accurate representation of the stable boundary layer (SBL) is a key issue for weather prediction and climate models. The SBL exerts a crucial influence controlling heat, moisture and momentum fluxes between the surface and the rest of the atmosphere. Some of the world's most stably stratified boundary layers develop on the Antarctic continent. The British Antarctic Survey has observed the boundary layer at their Halley Station for the past several decades. Previous work investigating stable boundary layers has tended to take either a purely observational or purely modelling-based approach.

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7

Carlsson, Magnus. "The stable boundary layer over the ice covered Bothnian Bay." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392449.

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The turbulence structure in a stable boundary layer over ice has been studied. Data from the Bothnian Bay, measured during the BASIS field campaign in February/March 1998, have been used. Turbulence as well as wind- and temperature profiles were measured at three sites. The sites were Umeå at the Swedish East Coast, Kokkola at the Finnish West Coast and the ship R/V Aranda outside the Finnish coast. Turbulence parameters are studied in terms of their stability dependence. At stronger stability σu/u*, σv/u* and σw/u* all increase with stability. At near neutral stratification σw/u* increases w

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8

Maienschein, Thomas Daniel. "Desingularizing the boundary of the moduli space of genus one stable quotients." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/325213.

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The moduli space of stable quotients, introduced by Marian, Oprea, and Pandharipande, provides a nonsingular compactification of the moduli space of degree d maps from smooth genus 1 curves into projective space ℙⁿ. This is done by allowing the domain curve to have nodal singularities and by admitting certain rational maps. The rational maps are introduced in the following way: A map to projective space can be defined by a quotient bundle of the trivial bundle on the domain curve; in the compactification, the quotient bundle is replaced by a sheaf which may not be locally free. The boundar

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9

Leda, Lucyna. "The Permian-Triassic boundary in the NW-Iranian Transcaucasus and in Central Iran." Doctoral thesis, Humboldt-Universität zu Berlin, 2020. http://dx.doi.org/10.18452/21106.

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Perm/Trias-Grenzprofile in den Regionen von Julfa (NW-Iran) und Abadeh (Zentral-Iran) zeigen eine Abfolge von drei charakteristischen Gesteinseinheiten, (1) den Paratirolites Limestone mit dem end-permischen Massensterbehorizont an seiner Oberkante, (2) den Boundary Clay und (3) die untertriassische Elikah-Formation mit der mit Conodonten definierten Perm/Trias-Grenze an seiner Basis. Die Karbonatmikrofazies zeigt eine Veränderung in den Profilen bei Julfa; innerhalb des Paratirolites Limestone ist eine zunehmende Anzahl von Intraklasten, Fe-Mn-Krusten und biogenen Verkrustungen erkennbar. Die

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10

Eriksson, Sofia. "Stable Numerical Methods with Boundary and Interface Treatment for Applications in Aerodynamics." Doctoral thesis, Uppsala universitet, Avdelningen för beräkningsvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-182953.

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In numerical simulations, problems stemming from aerodynamics pose many challenges for the method used. Some of these are addressed in this thesis, such as the fluid interacting with objects, the presence of shocks, and various types of boundary conditions. Scenarios of the kind mentioned above are described mathematically by initial boundary value problems (IBVPs). We discretize the IBVPs using high order accurate finite difference schemes on summation by parts form (SBP), combined with weakly imposed boundary conditions, a technique called simultaneous approximation term (SAT). By using the

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11

Maguire, Andrew J. "Numerical modelling of the stable atmospheric boundary layer overlying a uniform slope." Thesis, University of Sheffield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287633.

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12

Arduini, Gabriele. "Modelling the stable, nocturnal boundary layer: different approaches to turbulence closure problem." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5625/.

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Il lavoro è dedicato all'analisi fisica e alla modellizzazione dello strato limite atmosferico in condizioni stabili. L'obiettivo principale è quello di migliorare i modelli di parametrizzazione della turbulenza attualmente utilizzati dai modelli meteorologici a grande scala. Questi modelli di parametrizzazione della turbolenza consistono nell' esprimere gli stress di Reynolds come funzioni dei campi medi (componenti orizzontali della velocità e temperatura potenziale) usando delle chiusure. La maggior parte delle chiusure sono state sviluppate per i casi quasi-neutrali, e la difficoltà è trat

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13

Michelotti, Matteo. "The atmospheric stable boundary layer: Data analysis and comparison with similarity theories." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/6288/.

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The objective of this dissertation is to study the structure and behavior of the Atmospheric Boundary Layer (ABL) in stable conditions. This type of boundary layer is not completely well understood yet, although it is very important for many practical uses, from forecast modeling to atmospheric dispersion of pollutants. We analyzed data from the SABLES98 experiment (Stable Atmospheric Boundary Layer Experiment in Spain, 1998), and compared the behaviour of this data using Monin-Obukhov's similarity functions for wind speed and potential temperature. Analyzing the vertical profiles of var

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14

Meury, Patrick E. "Stable finite element boundary element Galerkin schemes for acoustic and electromagnetic scattering." lizenzfrei, 2007. http://e-collection.ethbib.ethz.ch/view/eth:30146.

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15

Hayden, Paul. "Building affected dispersion from elevated releases in neutral and stable boundary layers." Thesis, University of Surrey, 1998. http://epubs.surrey.ac.uk/844180/.

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A wind tunnel study was used to investigate flow and the dispersion of elevated emissions over and in the wake of both generic building groups and a real industrial site. Much research has been previously carried out on low level releases passing through extensive building arrays, but very little has treated elevated releases. The objective of the present research was to investigate the requirements of 'practical' models to predict dispersion from elevated releases above an industrial complex. The experiments were carried out in the EnFlo wind tunnel at the University of Surrey in simulated ne

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16

Mirocha, Jeffrey D. "An investigation of the stably-stratified atmospheric boundary layer over the Arctic Ocean during stable, clear-sky, winter conditions." Diss., Connect to online resource, 2005. http://wwwlib.umi.com/dissertations/fullcit/3186935.

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17

Tastula, Esa-Matti. "Insights into the Challenges of Modeling the Atmospheric Boundary Layer." Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5782.

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This work approaches the topic of modeling the atmospheric boundary layer in four research projects, which are summarized below. i) The diurnal cycles of near-surface meteorological parameters over Antarctic sea ice in six widely used atmospheric reanalyses were validated against observations from Ice Station Weddell. The station drifted from February through May 1992 and provided the most extensive set of meteorological observations ever collected in the Antarctic sea ice zone. For the radiative and turbulent surface fluxes, both the amplitude and shape of the diurnal cycles varied considerab

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18

Lindgren, Kristina. "The Behaviour of the Latent Heat Exchange Coefficient in the Stable Marine Boundary Layer." Thesis, Uppsala University, Department of Earth Sciences, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9140.

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<p>Knowledge of the turbulent fluxes at the sea surface is important for understanding the interaction between atmosphere and ocean. With better knowledge, improvements in the estimation of the heat exchange coefficients can be made and hence models are able to predict the weather and future climate with higher accuracy.</p><p>The exchange coefficients of latent and sensible heat during stable stratification vary in the literature. Therefore it is necessary to investigate the processes influencing the air-sea exchange of water vapour and heat in order to estimate these values. With measurement

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19

Nchupang, Mojalefa Prince. "Stable and high order accurate finite difference method for the incompressible laminar boundary layer equations." Master's thesis, Faculty of Engineering and the Built Environment, 2020. http://hdl.handle.net/11427/32732.

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Numerical simulations of incompressible flows are unequivocally important due to their numerous industrial applications. These applications ranges from the large-scale fluid's flow modelling such as aerodynamics [1], atmospheric-ocean modelling [2] to a simple pipe flows in the petroleum industry [3]. This study is devoted to develop a provably stable and high order approximation for the incompressible laminar boundary layer equations. A new set of energystable boundary conditions are derived using the energy method. It is shown that both the weak and strong implementation of these boundary co

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20

Mauritsen, Thorsten. "On the Arctic Boundary Layer : From Turbulence to Climate." Doctoral thesis, Stockholm : Department of Meteorology, Stockholm University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6585.

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21

Lazeroms, Werner. "Turbulence modelling applied to the atmospheric boundary layer." Doctoral thesis, KTH, Turbulens, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166806.

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Turbulent flows affected by buoyancy lie at the basis of many applications, both within engineering and the atmospheric sciences. A prominent example of such an application is the atmospheric boundary layer, the lowest layer of the atmosphere, in which many physical processes are heavily influenced by both stably stratified and convective turbulent transport. Modelling these turbulent flows correctly, especially in the presence of stable stratification, has proven to be a great challenge and forms an important problem in the context of climate models. In this thesis, we address this issue cons

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22

Whitley, Michael Aaron. "Grid stabilization for the one-dimensional advection equation using biased finite differnces of odd orders and orders higher than twenty-two." Thesis, Kansas State University, 2013. http://hdl.handle.net/2097/16285.

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Master of Science<br>Department of Mathematics<br>Nathan Albin<br>This work utilizes finite differences to approximate the first derivative of non-periodic smooth functions. Math literature indicates that stabilizing Partial Differential Equation solvers based on high order finite difference approximations of spatial derivatives of a non-periodic function becomes problematic near a boundary. Hagstrom and Hagstrom have discovered a method of introducing additional grid points near a boundary, which has proven to be effective in stabilizing Partial Differential Equation solvers. Hagstrom and

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23

Rodier, Quentin. "Paramétrisation de la turbulence atmosphérique dans la couche limite stable." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30343/document.

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Améliorer la représentation de la couche limite stable constitue un des grands challenges de la prévision numérique du temps et du climat. Sa représentation est clé pour la prévision du brouillard, du gel des surfaces, des inversions de température, du jet de basse couche et des épisodes de pollution. De plus, à l'échelle climatique, la hausse de la température moyenne globale de l'air en surface impacte davantage les régions polaires : améliorer la représentation de la couche limite stable est un enjeu important pour réduire les incertitudes autour des projections climatiques. Depuis une quin

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24

Schiavon, Mario. "The wind profile in the atmospheric stable boundary layer over complex terrain and heterogeneous surfaces: limitations of local similarity theory." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9582/.

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L'indagine ha riguardato il profilo del vento nei primi 30 metri dello strato limite atmosferico stabile nell'ambito della teoria di similarità locale. Ad oggi, diversi esperimenti hanno confermato la validità della teoria per strati-limite su terreni livellati e superfici omogenee. Tali condizioni ideali sono però infrequenti nella realtà ed è perciò importante capire quali siano i limiti della similarità locale per strati-limite su terreni complessi e superfici disomogenee. Entrambe le condizioni sono presenti a Ny-Alesund (Svalbard, Norvegia) dove il Consiglio Nazionale delle Ricerche (CNR

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25

Blein, Sébastien. "Observation et modélisation de couche limite atmosphérique stable en relief complexe : le processus turbulent d'écoulement catabatique." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI023/document.

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La couche-limite atmosphérique turbulente stable, particulièrement en zone de relief, n'est pas totalement comprise. Elle est, donc, mal représentée par les modèles atmosphériques. En présence de pente et d'un refroidissement du sol, l'augmentation locale de masse volumique génère un écoulement catabatique. En région de montagne, le maximum de vent est généralement enregistré à une hauteur (z_j) de 1-10 m. Le jet de paroi engendre un changement de signe du flux de qdm ainsi qu'une variabilité du flux de chaleur sensible proche du sol. Ces variabilités de flux turbulents contredisent l'applicab

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26

Arduini, Gabriele. "Processus de la couche limite atmosphérique stable hivernale en vallée alpine." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAU006/document.

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La dynamique de la couche limite atmosphérique d'une vallée alpine est influencée par le relief environnant et par l’écoulement de grande échelle qui la surmonte. La paramétrisation de cette circulation atmosphérique requiert donc de caractériser finement ces effets. C'est l’objectif de ce travail de thèse : comprendre l’influence du relief environnant une vallée sur les bilans de masse et de chaleur au travers d’une section de cette vallée, par conditions stables et sèches et lorsque le vent synoptique est faible mais non négligeable. Le travail s’appuie sur des simulations numériques.Plusieu

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27

Svensson, Nina. "Wind and atmospheric stability characteristics over the Baltic Sea." Licentiate thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-306948.

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In recent years there has been an increase in offshore wind energy, which poses the need for accurate wind speed estimates in the marine environment, especially in coastal areas where most wind turbines will be placed. This thesis is focused on the Baltic Sea, which is a small, semi-enclosed sea where land-sea interaction play an important role in explaining the wind patterns. Mesoscale model simulations can be used to study the marine environment, where observations are often scarce. In this thesis the Weather Research and Forecasting (WRF) model is used. In the first study simulations show t

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28

Barral, Hélène. "Couches limites atmosphériques en Antarctique : observation et simulation numérique." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENU053/document.

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La surface enneigée du continent Antarctique, sauf pour quelques heures les après-midi d'été, se refroidit constamment radiativement. Il en résulte une stratification stable persistante de la couche limite atmosphérique qui alimente un écoulement catabatique le long des pentes qui descendent du plateau vers l'océan. Les inversions de températures et les vitesses de vents associées sont extrêmes l'hiver où une inversion moyenne de 25°C sur le plateau et des vitesses dépassant les 200 km/h sur la côte sont régulièrement observées. L'été, les inversions restent très marquées la nuit, mais le réch

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29

Parmhed, Oskar. "Near surface atmospheric flow over high latitude glaciers." Doctoral thesis, Stockholm University, Department of Meteorology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-197.

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<p>In this thesis various descriptions of the near surface atmospheric flow over a high latitude glacier is used in an effort to increase our understanding of the basic flow dynamics there.</p><p>Through their contribution to sea-level change, mountain glaciers play a significant role in Earth’s climate system. Properties of the near surface atmospheric flow are important for understanding glacier response to climate change.</p><p>Here, the near surface atmospheric flow is studied from several perspectives including the effects of both rotation and slope. Rotation is an important aspect of mos

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30

Portioli, Marco. "Kapranov's realization of the moduli spaces of n-pointed stable curves of genus zero and generalizations." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13662/.

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This work presents an introduction to the geometry of the moduli space M_{0,n} of smooth algebraic curves of genus zero and presents two ways of compactifying it, yielding the space \overline{M}_{0,n}. In his first construction Kapranov, starting from a result by Castelnuovo, compactifies M_{0,n} by means of Veronese curves and their limit positions, yielding boundary divisors. On the other hand, Kapranov compactifies M_{0,n} by iterated blow-up of the projective space P^{n-3} at n-1 points in general position and at all linear spaces spanned by them, yielding exceptional divisors and the hy

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31

Vignon, Etienne. "La couche limite extrême du Plateau Antarctique et sa représentation dans les modèles de climat." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAU023/document.

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L’observation des couches limites atmosphériques au dessus du plateau antarctique a mis en évidence les plus fortes inversions de température proches de la surface de la planète. Bien paramétriser ces couches limites extrêmes dans un modèle de circulation générale est essentiel pour represéntercorrectement l’inversion climatologique de température au dessus du plateau, mais également pour reproduire des vents catabatiques réalistes en aval du plateau et de surcroit, une circulation atmosphérique correcte dans l’hémisphère sud. Les conclusions des précédentes "Gewex AtmosphericBoundary Layer St

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32

Roberts, Patrick. "Fruits of the forest : human stable isotope ecology and rainforest adaptations in Late Pleistocene and Holocene Sri Lanka." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:9f314a01-b062-4a9c-9f55-7db943294866.

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Despite ecological, anthropological, and archaeological debate surrounding their desirability as habitats for human occupation, tropical rainforests have received relatively little attention in discussions of Homo sapiens' Pleistocene dispersal. Sri Lanka has yielded some of the earliest dated fossil and material culture evidence (c. 38-35,000 cal. years BP) for our species in a modern rainforest context beyond Africa. Nevertheless, assertions in Sri Lanka, and elsewhere, regarding early human rainforest reliance have been largely based on coarse or 'off-site' palaeoenvironmental records, and

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33

Quimbayo-Duarte, Julian. "Modélisation numérique de la couche limite atmosphérique par condition stable en terrain complexe. Application à la qualité de l'air." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAU005/document.

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En hiver, par condition anticyclonique hivernale, les régions montagneuses urbanisées font l'objet de conditions atmosphériques stables et découplées, qui conduisent à des épisodes de forte pollution particulaire. Ce travail de thèse traite de la caractérisation des facteurs de pollution de l'air aux particules par condition stable en vallée alpine encaissée, du point de vue de la dynamique atmosphérique. Ce travail repose sur des simulations numériques idéalisées et en conditions réelles à l'aide du modèle Weather Research and Forecasting (WRF), les particules étant modélisées par un champ de

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Gimenes, Alex da Silva. "Simulação de fluido multifásico em imagens digitais." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-26052008-100626/.

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Simulação de fluidos tem sido um dos focos principais de pesquisa em computação gráfica nos últimos anos. O interesse por tal assunto é motivado pelas aplicações na indústria cinematográfica, jogos e sistemas voltados para simulação de fenômenos físicos realísticos em tempo real. Neste trabalho atacamos um problema ainda pouco explorado pela comunidade de computação gráfica, a simulação de fluidos em imagens digitais. Adotamos uma abordagem relacionando fluidos multifásicos, onde propriedades da imagem são incorporadas às equações de Navier-Stokes a fim de permitir que objetos contidos nas ima

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Dupuy, Florian. "Amélioration de la connaissance et de la prévision des vents de vallée en conditions stables : expérimentation et modélisation statistique avec réseau de neurones artificiels." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30365.

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L'objet de cette thèse est l'étude des écoulements en conditions stables dans une vallée dans le but de participer à l'amélioration des calculs de transport et dispersion atmosphérique dans ces conditions. Les stratifications stables sont en effet critiques car elles limitent les mouvements verticaux, ce qui réduit le mélange et la dispersion des composés émis près de la surface. De plus, dans ces conditions, les écoulements créés sont fortement dépendants du relief local, et donc difficiles à calculer précisément avec des modèles de prévision opérationnels, car la résolution requise devient p

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Felippe, Alana Cavalcante. "Invariantes globais de aplicações estáveis de superfícies fechadas em S²." Universidade Federal de Viçosa, 2013. http://locus.ufv.br/handle/123456789/4920.

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Made available in DSpace on 2015-03-26T13:45:35Z (GMT). No. of bitstreams: 1 texto completo.pdf: 1037099 bytes, checksum: 73ef343c6773880a845ee58f11f86a80 (MD5) Previous issue date: 2013-01-18<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This dissertation is devoted to the study of stable maps from closed surfaces to the sphere, from a global viewpoint. Associated of such maps domain, we study grafs with integers positive weight in the vertices as invariants, based in the Hacon, Mendes and Romero and works. And associated the image of these maps, we study the minimal con

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Dall'Ozzo, Cédric. "Modélisation d'écoulements atmosphériques stratifiés par Large-Eddy Simulation à l'aide de Code_Saturne." Phd thesis, Université Paris-Est, 2013. http://pastel.archives-ouvertes.fr/pastel-00861196.

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La modélisation par simulation des grandes échelles (Large-Eddy Simulation - LES) des processus physiques régissant la couche limite atmosphérique (CLA) demeure complexe de part la difficulté des modèles à capter l'évolution de la turbulence entre différentes conditions de stratification. De ce fait, l'étude LES du cycle diurne complet de la CLA comprenant des situations convectives la journée et des conditions stables la nuit est très peu documenté. La simulation de la couche limite stable où la turbulence est faible, intermittente et qui est caractérisée par des structures turbulentes de pet

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Duine, Gert-Jan. "Caractérisation des vents de vallée en conditions stables à partir de la campagne de mesures KASCADE et de simulations WRF à méso-échelle." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30258/document.

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Cette thèse est dédiée à la caractérisation des vents descendants de vallée en terrain complexe d'orographie modérée à moyenne latitude, dans le contexte de la réglementation des rejets atmosphériques de Cadarache. Cadarache est un des centres de recherche du "Commissariat à l'énergie atomique et aux énergies alternatives" (CEA), installé dans une petite vallée (CV) confluente à la vallée de la Durance (DV). Ces deux vallées se distinguent par leur taille, et sont le siège d'écoulements aux caractéristiques différentes en stratification stable. Un forçage synoptique faible associé à un ciel dé

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39

Conti, Tatiana de. "Avaliação do método do balanço da camada limite para a estimativa de fluxos turbulentos noturnos." Universidade Federal de Santa Maria, 2006. http://repositorio.ufsm.br/handle/1/9203.

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This work is about to verify the performance of the boundary layer budgeting method as alternative for measuring the surface turbulent fluxes in conditions that allow the validation of the measurements with data taken from a tower equipped with sensors, which were processed through the eddy correlation method. A research is made on the knowledge generated to the present, which reveals the limitations of the eddy correlation method and the promises of the boundary layer budgeting in relation to measuring the surface turbulent fluxes. This work describes its theoretical underpinnings, regarding

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Maroneze, Rafael. "Modelo simplificado para turbulência na camada limite noturna." Universidade Federal de Santa Maria, 2016. http://repositorio.ufsm.br/handle/1/9256.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>The appropriate estimation of turbulent fluxes in very stable conditions is a great challenge for numerical models that simulate the average behavior of the stable boundary layer. Although many features of the flow are usually reproduced, the intermittent variation turbulence is not simulated by most atmospheric models that use K theory for the determination of turbulent fluxes in the stable boundary layer. Moreover, the transition between the very stable and weakly stable regimes of the stable boundary layer is not well understo

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Santos, Alexandre Jesus dos. "Hipersuperfícies estáveis com curvatura média constante e fronteira livre." Pós-Graduação em Matemática, 2018. http://ri.ufs.br/jspui/handle/riufs/8036.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>A hypersurface in a manifold, both with nonempty boundary, is called free boundary hypersurface if it is a critical point of the area functional restricted to all admissible variations which preserve volume. A variation is admissible if the boundary and the interior of the manifold contains the boundary and the interior of the hypersurfaces of the variation, respectively. It is well known that free boundary hypersurface has constant mean curvature. In this work we study free boundary hypersurfaces in bounded convex dom

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Barnet, J. "Investigating climate change and carbon cycling during the Latest Cretaceous to Paleogene (~67-52 million years ago) : new geochemical records from the South Atlantic and Indian Oceans." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/35104.

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The Late Cretaceous–early Paleogene is the most recent period of Earth history with a dynamic carbon cycle that experienced sustained global greenhouse warmth and can offer a valuable insight into our anthropogenically-warmer future world. Yet, knowledge of ambient climate conditions and evolution of the carbon cycle at this time, along with their relation to forcing mechanisms, are still poorly constrained. In this thesis, I examine marine sediments recovered from the South Atlantic Walvis Ridge (ODP Site 1262) and Indian Ocean Ninetyeast Ridge (IODP Site U1443 and ODP Site 758), to shed new

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Costa, Felipe Denardin. "Caminhos para a complexidade na camada limite atmosférica noturna." Universidade Federal de Santa Maria, 2011. http://repositorio.ufsm.br/handle/1/3896.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The focus of the present thesis is the nocturnal atmospheric boundary layer, under very stable conditions. In such situation, the turbulence production by the vertical wind shear may have similar magnitude to the total turbulence destruction by the thermal stratification and molecular dissipation terms. Besides being in near balance, the turbulence production and destruction are, each of them, functions of the turbulence intensity itself. This condition causes situations on which the system behaves on a manner different than that e

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Brogno, Luigi. "Nocturnal low-level jets over complex terrain: driving mechanisms and analytical modeling." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20539/.

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Several studies in the Atmospheric Physics have focused on the analysis of the atmospheric circulation phenomena at the small scale and turbulent processes within the planetary boundary layer (PBL), whose formation and evolution is complicated by the topography. The Low-Level Jet (LLJ) is one of the most studied phenomena and it is not yet completely understood. It consists in the occurrence of strong winds within a thin layer of the PBL. A particular case is the formation of double-nose LLJs (or multiple LLJs), i.e. the simultaneous occurrence of two (or multiple) noses within the PBL. An

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Battisti, Adriano. "PARAMETRIZAÇÃO DE TURBULÊNCIA NA PREVISIBILIDADE DE TEMPERATURAS MÍNIMAS EM UM MODELO DE MESOESCALA." Universidade Federal de Santa Maria, 2014. http://repositorio.ufsm.br/handle/1/10279.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The present study aims to evaluate the quality of nocturnal temperature forecast made by a mesoscale numerical model and to understand the reasons behind the difficulties found. To do that, the Weather Research and Forecast (WRF) model is used, with the same configuration employed for operational weather forecast. The model has been ran for the 31 nights of July 2012, and temperature outputs have been compared to hourly observations measured by 26 weather stations scattered over the entire state of Rio Grande do Sul. Four different

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Lovato, Rodrigo Gularte, and Rodrigo Gularte Lovato. "Estimativa da constante de Kolmogorov (C0) para a camada limite estável usando simulação dos grandes turbilhões." Universidade Federal de Pelotas, 2007. http://repositorio.ufpel.edu.br/handle/ri/2182.

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Made available in DSpace on 2014-08-20T14:25:46Z (GMT). No. of bitstreams: 1 dissertacao_rodrigo_lovato_paginas_pre_e_pos_textuais.pdf: 119173 bytes, checksum: e57cbc1af9ef2f4d32dabdf2e4714175 (MD5) Previous issue date: 2007-02-28<br>Neste trabalho, nós estimamos a constante de Kolmogorov, C01 através da determinação de um conjunto de trajetórias Lagrangeanas em uma Camada Limite Estável simulada pelo modelo de simulação dos grandes turbilhões (Large-Eddy Simulation model). A partir do conjunto de trajetórias, a forma da função de estrutura da velocidade Lagrangeana no subintervalo inercia

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Lange, Carsten. "Advanced nonlinear stability analysis of boiling water nuclear reactors." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-24954.

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This thesis is concerned with nonlinear analyses of BWR stability behaviour, contributing to a deeper understanding in this field. Despite negative feedback-coefficients of a BWR, there are operational points (OP) at which oscillatory instabilities occur. So far, a comprehensive and an in-depth understanding of the nonlinear BWR stability behaviour are missing, even though the impact of the significant physical parameters is well known. In particular, this concerns parameter regions in which linear stability indicators, like the asymptotic decay ratio, lose their meaning. Nonlinear stability a

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Dill, Thaís Freitas. "ANÁLISE DA ESTRUTURA VERTICAL DO ESCOAMENTO ATMOSFÉRICO DURANTE OCORRÊNCIA DE EVENTOS TURBULENTOS INTERMITENTES NA CAMADA LIMITE NOTURNA." Universidade Federal de Santa Maria, 2015. http://repositorio.ufsm.br/handle/1/10287.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The objective of this study is to analyze the vertical structure of the intermittent turbulent events in the very stable boundary layer, as well the analysis and characterization of events originated near the surface that propagate upward. Therefore, it was used observational data from the FLOSSII experiment, together with the results of simulations using a numerical model that is able to reproduce the occurrence of turbulence bursts in the very stable boundary layer. The data have a total of 108 nights, from 20th of November 2002

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Rees, J. M. "Studies of internal gravity waves in the stably stratified troposphere." Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383343.

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Apsley, David D. "Numerical modelling of neutral and stably stratified flow and dispersion in complex terrain." Thesis, University of Surrey, 1995. http://epubs.surrey.ac.uk/649/.

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