Virtual Level Analysis Applied to Wave Flume Experiments: The Case of Waves-Cubipod Homogeneous Low-Crested Structure Interaction

Abstract

This paper presents the use of virtual level (VL) probes as an alternative image-based approach to investigate the interaction of waves with coastal structures in wave flume experiments. These probes are defined as regions of interest located at specific positions along the horizontal domain of the images, in which edge interfaces are detected and, thus, their vertical motions can be obtained. To demonstrate the use of the methodology, a critical condition of breaking waves interacting with a Cubipod homogeneous low-crested structure (HLCS) in a two-dimensional framework was selected. With the video recorded from the experiments, image calibration, processing, and analysis stages were implemented to analyze the performance of the HLCS in reducing wave elevations and to study the stability of the armor units. The present approach can be extended to a wide range of coastal structures applications where the interface detection between components of the scene is useful to observe the behavior of coastal structures, increasing effectiveness and alternatives to acquire precise data in 2D experimental tests.

Development of a Low-Cost Measurement Prototype Based on Image Processing for Mechanical Testing

“…Análisis de nivel virtual aplicado a experimentos de canales de olas: El caso de las ondascuboides homogéneas de cresta baja Interacción de estructuras (Escudero et al, 2021).…”

On the Evolution of Different Types of Green Water Events

“…Some studies that investigate the propagation of water over the deck of a marine structure have used obstructive wave probe sensors to obtain information on flow evolution based on the variation of water surface elevations; for instance, see [1,13,[20][21][22][23]. It is known that these types of sensors, which can be conductive [24], capacitive [25], or resistive [26], provide time series of single-valued measurements of water elevation at a specific location [27] (see singlevalued water surface elevation, SVWS, in Figure 1a). Nevertheless, for some applications, such as in overturning surfaces, conventional sensors cannot simultaneously measure multiple surfaces [28].…”

Terra do Mar Doce: contribuições da academia para a navegação na Amazônia

“…Em contraste, as câmeras podem aumentar significativamente a área de cobertura de informações, seja com a troca de suas lentes ou até mesmo mudando o ângulo e posicionamento delas. Desta forma, em casos de medições em condições controladas como em laboratórios(ESCUDERO et al, 2021), até condições mais complexas como em alto mar(ROSSI et al, 2021), a utilização de câmeras conseguiria se adequar com mais coerência às necessidades.Um exemplo das vantagens de utilizar sensores virtuais para medir elevações da superfície livre d'água em ensaios experimentais é mostrado na Figura 6. A figura mostra as medições obtidas em uma instalação bidimensional na qual foram pesquisados eventos de embarque d'água no convés de uma estrutura fixa(HERNÁNDEZ-FONTES et al, 2019a).Foram considerados 33 wave probes virtuais distribuídos acima do convés da estrutura, sendo separados a cada 10 mm.…”