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You searched for subject:(Wave induced processes). Showing records 1 – 2 of 2 total matches.

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1. Mendes, D. Study of the hydrodynamics and morhodynamics of the Óbidos Lagoon, Portugal.

Degree: 2015, RCAAP

Este registo pertence ao Repositório Científico do LNEC

Na lagoa de Óbidos, as ondas e as correntes de maré induzem rápidas alterações morfológicas levando ao fecho da sua embocadura. As dragagens são frequentes tendo o objetivo de manter a laguna aberta e proteger as construções marginais. No entanto, o efeito das dragagens no comportamento da embocadura é um tema pouco estudado, especialmente o impacto que poderá ter a adição de canais transversais aos tradicionais canais dragados. No interior desta laguna as ondas induzem alterações significativas nas condições hidrodinâmicas. Através da aplicação de um modelo acoplado constituído por um modelo hidrodinâmico e um modelo de agitação marítima concluiu-se que as elevações da superfície livre dentro da lagoa aumentaram para uma direcção média da onda perpendicular à linha de costa. Foi também investigado o impacto que a interacção completa entre ondas e correntes tem na dinâmica sedimentar da lagoa de Óbidos, concluindo-se que o transporte de sedimentos para o interior aumenta em 30% durante a enchente se esta interacção for tida em conta no modelo numérico. Os três planos de dragagens foram avaliados através da implementação de um modelo morfodinâmico. Os novos planos de dragagens aumentaram o prisma de maré e reduziram as diferenças de duração entre a vazante e a enchente devido aos canais principais norte e sul. Os canais transversais aumentaram o assoreamento no canal principal sul e promoveram a estabilidade do canal principal norte. No entanto, devido às baixas profundidades e a uma agitação marítima muito energética, as soluções de dragagens são incapazes estabilizar permanentemente a lagoa de Óbidos

DHA/NEC

Subjects/Keywords: Morphodynamic model; Dredging; Wave-induced processes; Tidal inlets; Transverse channels; Dredging equilibrium depth

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

APA (6th Edition):

Mendes, D. (2015). Study of the hydrodynamics and morhodynamics of the Óbidos Lagoon, Portugal. (Thesis). RCAAP. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:localhost:123456789/1007356

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Mendes, D. “Study of the hydrodynamics and morhodynamics of the Óbidos Lagoon, Portugal.” 2015. Thesis, RCAAP. Accessed January 21, 2021. http://www.rcaap.pt/detail.jsp?id=oai:localhost:123456789/1007356.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Mendes, D. “Study of the hydrodynamics and morhodynamics of the Óbidos Lagoon, Portugal.” 2015. Web. 21 Jan 2021.

Vancouver:

Mendes D. Study of the hydrodynamics and morhodynamics of the Óbidos Lagoon, Portugal. [Internet] [Thesis]. RCAAP; 2015. [cited 2021 Jan 21]. Available from: http://www.rcaap.pt/detail.jsp?id=oai:localhost:123456789/1007356.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mendes D. Study of the hydrodynamics and morhodynamics of the Óbidos Lagoon, Portugal. [Thesis]. RCAAP; 2015. Available from: http://www.rcaap.pt/detail.jsp?id=oai:localhost:123456789/1007356

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)

2. Makris, Christos. Υπολoγιστική προσομοίωση παράκτιων κυματικών διεργασιών με τη χρήση της σωματιδιακής μεθόδου Smoothed Particle Hydrodynamics (SPH).

Degree: 2014, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)

The subject of the doctoral dissertation is the effect of near-shore wave breaking of weak plunging form, transverse to a coast with impermeable bottom and constant mild slope, and the consequent creation of wave-induced coastal processes within the surf zone. The research focuses on the configuration, implementation, and calibration of a modern numerical simulation model, in the framework of the relatively recent computational method Smoothed Particle Hydrodynamics (SPH). The primary objective is to reproduce and analyze thoroughly the phenomenon of regular nonlinear waves breaking in the coastal zone, and the ultimate goal is the detailed mapping of the turbulent hydrodynamic field kinematics in the surf zone. To this end, the numerical simulation method SPH is implemented, which is based on particle-type spatial discretization and uses the concept of integral smoothing operators throughout the whole computational domain that is described by the full Navier-Stokes equations with Lagrange formulation. The usage of this numerical method in the present thesis implies, that another key objective is the implementation and certification of the ability of SPH to reproduce in detail the violent phenomenon of plunging wave breaking, regarding all classical wave features in the surf zone, the relevant strong free-surface deformations, and the consequent more complex turbulent flow properties. In this effort, another main objective is to check the ability of the model to simulate the wave-induced processes, such as the mean free surface elevation within the surf zone, the cross-shore currents etc. Another main request is the model validation in relation to the coherent turbulent structures and intermittent events in the surf zone. In this direction, a turbulence “closure” model is used, for the sub-particle scale Reynolds stresses, similarly to sub-grid scale stresses, with a Smagorinsky-type approach, as is the common practice in Large Eddy Simulations. To achieve these goals, besides the classic wave characteristics, the numerical mappings of the wave-induced turbulent flow features, such as the recurring vortical patterns, the coherent turbulent structures, the Fourier spectra of the turbulent velocity fluctuations, the turbulent kinetic energy and the Reynolds stresses fields were reproduced in detail, by combining different heuristic methods. These concern sampling methods (using convolution integral interpolation for Lagrange to Euler field conversion) with an ensemble-averaging technique for turbulent hydrodynamic features, in order to separate the ordered rotational wave motions from large-scale coherent structures and small-scale residual turbulence. Additionally, the intermittent processes of surf zone turbulence are categorized through proper statistical treatment, thus providing identification of specific mechanisms that invoke and arise as a result of coastal breaking waves, especially weak plungers. The results of SPH simulations are compared with available experimental data.

Αντικείμενο της διδακτορικής…

Subjects/Keywords: Αριθμητική προσομοίωση; Θραύση κυματισμών; Τυρβώδεις κυματογενείς διεργασίες; Υδροδυναμική σωματιδιακής εξομάλυνσης; Numerical simulation; Wave breaking; Turbulent wave-induced processes; Smoothed particle hydrodynamics

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Makris, C. (2014). Υπολoγιστική προσομοίωση παράκτιων κυματικών διεργασιών με τη χρήση της σωματιδιακής μεθόδου Smoothed Particle Hydrodynamics (SPH). (Thesis). Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Retrieved from http://hdl.handle.net/10442/hedi/34666

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Makris, Christos. “Υπολoγιστική προσομοίωση παράκτιων κυματικών διεργασιών με τη χρήση της σωματιδιακής μεθόδου Smoothed Particle Hydrodynamics (SPH).” 2014. Thesis, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Accessed January 21, 2021. http://hdl.handle.net/10442/hedi/34666.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Makris, Christos. “Υπολoγιστική προσομοίωση παράκτιων κυματικών διεργασιών με τη χρήση της σωματιδιακής μεθόδου Smoothed Particle Hydrodynamics (SPH).” 2014. Web. 21 Jan 2021.

Vancouver:

Makris C. Υπολoγιστική προσομοίωση παράκτιων κυματικών διεργασιών με τη χρήση της σωματιδιακής μεθόδου Smoothed Particle Hydrodynamics (SPH). [Internet] [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2014. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10442/hedi/34666.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Makris C. Υπολoγιστική προσομοίωση παράκτιων κυματικών διεργασιών με τη χρήση της σωματιδιακής μεθόδου Smoothed Particle Hydrodynamics (SPH). [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2014. Available from: http://hdl.handle.net/10442/hedi/34666

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.