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Authors
Abstract(s)
O trabalho realizado surge devido à necessidade de simular eventos como tempestades,
nomeadamente através do desenvolvimento de um protótipo num canal bidimensional
tendo em vista a análise das consequências para posterior previsão e alerta dos mesmos.
Nos ensaios de estabilidade, o método de análise vulgarmente utilizado é o da contagem
visual do número de movimentos e quedas dos blocos que compõem o manto resistente
do quebra-mar, estando esta técnica condicionada pela experiência do observador. Os
métodos de análises da agitação frequentemente utilizados são o da análise espetral
(baseado num espetro de energia) e o da análise temporal (ao longo do tempo) sendo
necessário uma ferramenta informática, como é o caso do SAM (Software de Análise de
Agitação Marítima), para geração de agitação, aquisição de registos e posterior
facilidade na análise.
Foram então realizados ensaios em modelo físico reduzido no canal de ondas irregulares
do Núcleo de Portos e Estruturas Marítimas do Laboratório Nacional de Engenharia
Civil. O perfil da seção utilizado foi a zona do cais do quebra-mar sul da Praia da
Vitória tendo sido testados os períodos de pico de 10s, 14s e 18s associados a diferentes
alturas significativas entre 5.50m e 9.00m para dois níveis de maré (Preia-mar e Baixamar).
The work was done due to the need to simulate events such as storms, namely through the development of a prototype in a two-dimensional channel in order to analyze the consequences for later forecasting and alert them. In the stability tests, the method of analysis commonly used is the visual counting of the number of movements and falls of the elements that make up armor layer of the breakwater. This technique is mainly conditioned by the experience of the observer. The frequently used wave conditions analysis methods are spectral analysis (based on an energy spectrum) and the time analysis, both requiring a computer tool, as is the case of SAM. This tool is used for generation of agitation, acquisition and easy analysis of the data collected in scale model tests. Tests were conducted on a two-dimensional scale model in one of the irregular wave flumes at Ports and Marine Structures Section (NPE) of the National Laboratory of Civil Engineering (LNEC). The mooring area of the southern breakwater of Praia da Vitória harbor was used as the cross section, and the tested peak periods were 10s, 14s and 18s associated with different significant wave heights between 5.50 and 9.00 meters for high and low tides.
The work was done due to the need to simulate events such as storms, namely through the development of a prototype in a two-dimensional channel in order to analyze the consequences for later forecasting and alert them. In the stability tests, the method of analysis commonly used is the visual counting of the number of movements and falls of the elements that make up armor layer of the breakwater. This technique is mainly conditioned by the experience of the observer. The frequently used wave conditions analysis methods are spectral analysis (based on an energy spectrum) and the time analysis, both requiring a computer tool, as is the case of SAM. This tool is used for generation of agitation, acquisition and easy analysis of the data collected in scale model tests. Tests were conducted on a two-dimensional scale model in one of the irregular wave flumes at Ports and Marine Structures Section (NPE) of the National Laboratory of Civil Engineering (LNEC). The mooring area of the southern breakwater of Praia da Vitória harbor was used as the cross section, and the tested peak periods were 10s, 14s and 18s associated with different significant wave heights between 5.50 and 9.00 meters for high and low tides.
Description
Relatório de estágio para obtenção do grau de mestre em Engenharia Civil no ramo de Hidráulica
Keywords
Quebra-mar de talude Breakwaters Ensaios em modelo reduzido Two-dimensional scale test Análise da estabilidade Stability analysis Análise espetral Spectrum analysis Análise temporal Time analysis
Citation
BASTOS, Miguel Ângelo Silva - Utilização de ferramentas informáticas para apoio à avaliação do dano em modelo físico reduzido. Lisboa: Instituto Superior de Engenharia de Lisboa, 2017. Dissertação de mestrado.
Publisher
Instituto Superior de Engenharia de Lisboa