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University of New South Wales

1. Jiang, Donghui. Development and Implementation of a Coastal Ocean Circulation Model for Jervis Bay, New South Wales: A Downscaling Approach.

Degree: Physical, Environmental & Mathematical Sciences, 2018, University of New South Wales

Based on the well-known Princeton Ocean Model (POM), this thesis aims to develop and implement a coastal ocean circulation model, named as the Bay model in this study, for a small coastal embayment ― Jervis Bay, New South Wales, Australia. In order to obtain the open boundary conditions, the Bay model was nested into the Australian national global ocean model – Bluelink. The Bay model was validated via examining its performance in reproducing a historic winter cooling event occurred in the Bay; and then it was applied to study a coastal upwelling event in the Bay, which proves that it works properly.The application of downscaling techniques becomes crucial for the development and implementation of the Bay model since there exist data gaps in temporal and spatial resolutions between the Bay model and the Bluelink. To represent the inflow of the East Australian Current (EAC) into the model domain, I developed the Scale Selective Approach for Temperature (SSAT) that was used for the temperature nesting at the northern open boundary of the Bay model. Based on the approach of state variable decomposing, the SSAT solves a simplified heat conservation equation to obtain the local and global components of the temperature to get the temperature condition. This study indicates that the SSAT works better than does the clamped condition.The Bay model was validated with the dataset provided by Wang and Symonds (1999) and used to study the flushing of the Bay driven by various forcing including winter cooling, overnight cooling, and the EAC. The results of the numerical experiments indicate that winter-cooling is the most effective mechanism for flushing the Bay, but the relative importance of the mechanisms is unclear since their occurrence frequencies in recent years are unknown. As a case study, I applied the validated Bay model to study the upwelling event in the end of September, 2011. The model results uncover the intruding of the cold deep ocean water into the Bay and its exiting to the shelf ocean. I assessed the performance of the SSAT against that of the clamped approach in determining the temperature boundary conditions and found that the SSAT significantly improves the determination of the temperature boundary condition. The results of the Bay model generally agree with the current and temperature observed by the Australian Integrated Marine Observing System (IMOS) and the satellite Sea Surface Temperature (SST) data; but there exist obvious temperature differences in the region close to the south open boundary, which may be induced by the application of the radiative conditions for this boundary. The flushing efficiencies driven by varying upwelling-favorable winds were examined in four cases including polewards-blowing Alongshore wind (A), Northerly (N) wind, North-Easterly (NE) wind, and North-Westerly (NW) wind. I found that the polewards-blowing Alongshore wind produced the strongest upwelling in the region of the Bay, however the Northerly wind is the most effective wind forcing in flushing the Bay. In terms of… Advisors/Committee Members: Wang, Xiao Hua, Physical, Environmental & Mathematical Sciences, Australian Defence Force Academy, UNSW, Hamilton, Les, Senior Researcher at the Defence Science & Technology Organization (DSTO) in Sydney, Australia, Sheng, Jinyu, Professor at the Department of Oceanography, Dalhousie University, CANADA.

Subjects/Keywords: Downscaling techniques; Princeton Ocean Model; Temperature nesting; Scale selective approach; State variable decomposition; Jervis Bay; Winter cooling; Wind-driven upwelling; East Australian Current; Flushing time; Open Boundary Condition; Ocean modeling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Jiang, D. (2018). Development and Implementation of a Coastal Ocean Circulation Model for Jervis Bay, New South Wales: A Downscaling Approach. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/60911

Chicago Manual of Style (16th Edition):

Jiang, Donghui. “Development and Implementation of a Coastal Ocean Circulation Model for Jervis Bay, New South Wales: A Downscaling Approach.” 2018. Doctoral Dissertation, University of New South Wales. Accessed October 22, 2020. http://handle.unsw.edu.au/1959.4/60911.

MLA Handbook (7th Edition):

Jiang, Donghui. “Development and Implementation of a Coastal Ocean Circulation Model for Jervis Bay, New South Wales: A Downscaling Approach.” 2018. Web. 22 Oct 2020.

Vancouver:

Jiang D. Development and Implementation of a Coastal Ocean Circulation Model for Jervis Bay, New South Wales: A Downscaling Approach. [Internet] [Doctoral dissertation]. University of New South Wales; 2018. [cited 2020 Oct 22]. Available from: http://handle.unsw.edu.au/1959.4/60911.

Council of Science Editors:

Jiang D. Development and Implementation of a Coastal Ocean Circulation Model for Jervis Bay, New South Wales: A Downscaling Approach. [Doctoral Dissertation]. University of New South Wales; 2018. Available from: http://handle.unsw.edu.au/1959.4/60911

2. Andutta, Fernando Pinheiro. "Experimentos e modelagem numérica com aplicação ao Estuário Tropical do Rio Curimataú, RN".

Degree: Mestrado, Oceanografia Física, 2006, University of São Paulo

A distribuição e a variabilidade de propriedades termohalinas e a circulação tridimensional do estuário do rio Curimataú foram estudadas com a aplicação do modelo numérico de simulações Delft3D-Flow, validado com dados experimentais medidos durante dois ciclos consecutivos de maré de quadratura e de sizígia. Duas grades numéricas foram aplicadas com o intuito de observar as diferenças entre as simulações nos modos barotrópico e baroclínico. As condições iniciais de simulações tais como: salinidade, velocidade, densidade e coeficientes cinemáticos de viscosidade, difusividade horizontal e vertical foram obtidas mediante resultados de simulações sob condições iniciais homogêneas. A seguir, o modelo numérico foi utilizado em condições mais realistas que foram comparadas aos dados experimentais. As simulações para a estrutura de salinidade, no modo barotrópico na maré de sizígia, apresentaram os melhores resultados, em comparação com os resultados experimentais, confirmado pelo índice de validação Skill igual 0,96; no modo baroclínico as simulações também foram de boa qualidade e o Skill foi muito próximo ao anterior (0,94). As simulações teóricas do campo de velocidade também foram de boa qualidade, comparativamente aos dados experimentais; os índices de validação médios foram muito próximos para os modos barotrópico e baroclínico (0,80 e 0,79). Esses valores do índice de validação confirmam que a dinâmica e os processos de mistura de natureza advectiva e difusiva foram bem representados matematicamete. Durante a maré de quadratura os resultados teóricos dos modos barotrópico e baroclínico não foram de boa qualidade (índice skill próximo a 0,60), devido às dificuldades de imposição de condições de contorno adequadas para a alta descarga fluvial que ocorreu durante os experimentos. Além das simulações por intervalos de tempo de 25 h, que foram utilizadas para validação com os dados experimentais, também foram feitas simulações inéditas horárias das características termohalinas, da circulação e do transporte advectivo de sal em séries temporais de 16 e 90 dias nos modos baroclínico e barotrópico, respectivamente. Aos resultados simulados das estruturas de salinidade e de velocidade, no modo baroclínico e maré de sizígia, foram aplicadas as metodologias rotineiramente utilizadas no processamento e análise de dados experimentais, com a finalidade de interpretar o comportamento dinâmico e os processos de mistura e transporte. No modo baroclínico, durante ambas as marés de sizígia e quadratura, a região inferior do estuário foi classificada como parcialmente misturado (tipo 2a), com valores baixos para os parâmetros de estratificação O(10-2)<pe< O(10-3) e com o parâmetro de circulação variando consideravelmente entre valores altos (pc50) e baixos (pc2). A análise da variabilidade dos coeficientes cinemáticos de viscosidade e difusividade no canal estuarino do rio Curimataú indicou que esses coeficientes variaram no seguinte intervalo: 10-3 m2 s-1 a 1,2x10-2 m2 s-1. A energia cinética turbulenta e as… Advisors/Committee Members: Miranda, Luiz Bruner de.

Subjects/Keywords: circulação tridimensional; Modelagem numérica; Numerical model; propriedades termohalinas e tempo de residência; termohaline properties and flushing time; three-dimensional circulation

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APA (6th Edition):

Andutta, F. P. (2006). "Experimentos e modelagem numérica com aplicação ao Estuário Tropical do Rio Curimataú, RN". (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/21/21132/tde-11102006-110223/ ;

Chicago Manual of Style (16th Edition):

Andutta, Fernando Pinheiro. “"Experimentos e modelagem numérica com aplicação ao Estuário Tropical do Rio Curimataú, RN".” 2006. Masters Thesis, University of São Paulo. Accessed October 22, 2020. http://www.teses.usp.br/teses/disponiveis/21/21132/tde-11102006-110223/ ;.

MLA Handbook (7th Edition):

Andutta, Fernando Pinheiro. “"Experimentos e modelagem numérica com aplicação ao Estuário Tropical do Rio Curimataú, RN".” 2006. Web. 22 Oct 2020.

Vancouver:

Andutta FP. "Experimentos e modelagem numérica com aplicação ao Estuário Tropical do Rio Curimataú, RN". [Internet] [Masters thesis]. University of São Paulo; 2006. [cited 2020 Oct 22]. Available from: http://www.teses.usp.br/teses/disponiveis/21/21132/tde-11102006-110223/ ;.

Council of Science Editors:

Andutta FP. "Experimentos e modelagem numérica com aplicação ao Estuário Tropical do Rio Curimataú, RN". [Masters Thesis]. University of São Paulo; 2006. Available from: http://www.teses.usp.br/teses/disponiveis/21/21132/tde-11102006-110223/ ;

3. Khojasteh Pour Fard, Iman. Modélisation des échanges dissous entre l'estuaire de la Loire et les baies côtières adjacentes : Modelling of dissolved exchanges between the Loire estuary and the adjacent coastal bays.

Degree: Docteur es, Physique de l'environnement, 2015, Bordeaux

Les estuaires sont des zones à l’interface terre-mer au coeur de la question du devenir des apports continentaux drainés par les grands bassins versants. L’objet de cette étude est focalisé sur l’estuaire de la Loire et ses zones adjacentes (i.e. baie de Bourgneuf et le Mor-Bras) situés dans le nord-est du Golfe de Gascogne. C’est un environnement soumis à l’influence significative de la marée qui se propage en amont de l’embouchure à plus de 100 km, de forçages météorologiques de moyennes latitudes donc hautement variables qui induisent en particulier des débits fluviaux pouvant varier d’un facteur dix. Cette variabilité est étudiée à l’aide d’un modèle numérique et des outils de description de la circulation qui permettent de mieux cerner les temps de séjours et de transits des eaux continentales dans l’estuaire et vers les baies riveraines. L’approche s’appuie sur un modèle en grille structurée mais dont la malléabilité pour décrire la complexité du domaine à simuler est donnée par le caractère non orthogonal des mailles employées pour la discrétisation. Le choix d’un système de coordonnées optimale (covariantes ou contravariantes) est discuté puis implémenté dans le code MARS-3D. Ce nouvel outil est qualifié et validé sur des cas-test puis implémenté en conditions réelles sur un domaine à la géométrie particulièrement accidentée. Les simulations reproduisent très finement la dynamique du grand panache de la Loire et confirment sa très grande variabilité spatiale et temporelle que décrivent partiellement des observations à haute fréquence et ponctuelles ; elles permettent de décrire les chemins privilégiés des masses d’eau à travers les sections de références choisies.

Estuaries are key areas in between land and ocean which play a major role in the spreading ofcontinental runoff drained by large watershed. This study focused on the Loire Estuary and its adjacentbays (i.e. Bourgneuf bay and Mor-Braz sea) all located in the north-east side of the bay of Biscay. It isinfluenced by the large tidal wave that propagates upstream the mouth on more than a 100 km, by highlymid-latitude meteorological forcing that may not only induced High variability in the circulation driversbut also on the river runoffs that may vary from 1 to 10 from early spring to late summer. This Highvariability is studied thanks to numerical simulation and tools dedicated to describe the circulation withsynthetic index such as transit time and mean age of water. The approach lies on a numerical modeldiscretized on a structure grid which constraints have been relaxed to better fit the fractal coastal lineusing non orthogonal grid cells. The optimal coordinate framework (co or contra-variant) have beendiscussed, and implemented within a pre-existing code (i.e. MARS-3D). This tools was validated withtest cases and implemented on a domain with a particular complex geometry. The numerical simulationscatch very accurately the dynamic of this large plume at least as it is described by available in situobservations. This numerical solution allowed to…

Advisors/Committee Members: Sénéchal, Nadia (thesis director), Le Hir, Pierre (thesis director), Dumas, Franck (thesis director).

Subjects/Keywords: Hydrodynamique côtière; Golfe de Gascogne; Simulations Numériques; Estuaire de la Loire; MARS-3D; Non-Orthogonal; Maillage Curviligne; Coastal Hydrodynamics; River Plume; Loire Estuary (France); Biscay Bay; Flushing Time; MARS-3D; Non-Orthogonal; Curvilinear grid

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Khojasteh Pour Fard, I. (2015). Modélisation des échanges dissous entre l'estuaire de la Loire et les baies côtières adjacentes : Modelling of dissolved exchanges between the Loire estuary and the adjacent coastal bays. (Doctoral Dissertation). Bordeaux. Retrieved from http://www.theses.fr/2015BORD0300

Chicago Manual of Style (16th Edition):

Khojasteh Pour Fard, Iman. “Modélisation des échanges dissous entre l'estuaire de la Loire et les baies côtières adjacentes : Modelling of dissolved exchanges between the Loire estuary and the adjacent coastal bays.” 2015. Doctoral Dissertation, Bordeaux. Accessed October 22, 2020. http://www.theses.fr/2015BORD0300.

MLA Handbook (7th Edition):

Khojasteh Pour Fard, Iman. “Modélisation des échanges dissous entre l'estuaire de la Loire et les baies côtières adjacentes : Modelling of dissolved exchanges between the Loire estuary and the adjacent coastal bays.” 2015. Web. 22 Oct 2020.

Vancouver:

Khojasteh Pour Fard I. Modélisation des échanges dissous entre l'estuaire de la Loire et les baies côtières adjacentes : Modelling of dissolved exchanges between the Loire estuary and the adjacent coastal bays. [Internet] [Doctoral dissertation]. Bordeaux; 2015. [cited 2020 Oct 22]. Available from: http://www.theses.fr/2015BORD0300.

Council of Science Editors:

Khojasteh Pour Fard I. Modélisation des échanges dissous entre l'estuaire de la Loire et les baies côtières adjacentes : Modelling of dissolved exchanges between the Loire estuary and the adjacent coastal bays. [Doctoral Dissertation]. Bordeaux; 2015. Available from: http://www.theses.fr/2015BORD0300

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