A simplified and open-source approach for multiple-valued water surface measurements in 2D hydrodynamic experiments

Hernández-Fontes, Jassiel V.; Hernández, Irving D.; Silva, Rodolfo; Mendoza, Edgar; Esperança, Paulo T. T.

doi:10.1007/s40430-020-02702-x

Cited by 8 publications

(13 citation statements)

References 34 publications

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“…To perform the MVWS elevation measurements, the gray-scale videos in the database (resolution of 769 × 441 px) were binarized in order to perform morphological operations, following the procedures presented in [29,31], for use in ImageJ software (NIH, Bethesda, MD, USA). These works offered simplified procedures and open-source software to obtain time series of effective water heights [31] and SVWS and MVWS elevation measurements [29] in 2D hydrodynamic experiments, disregarding the differentiation of possible 3D effects on the water surface and bubbles entrapped in the flow. In this work, the procedure to obtain the measurements of MVWS elevations based on contours [29] was adapted for the present configuration of the input videos.…”

Section: Mvws Elevation Measurementsmentioning

confidence: 99%

“…These works offered simplified procedures and open-source software to obtain time series of effective water heights [31] and SVWS and MVWS elevation measurements [29] in 2D hydrodynamic experiments, disregarding the differentiation of possible 3D effects on the water surface and bubbles entrapped in the flow. In this work, the procedure to obtain the measurements of MVWS elevations based on contours [29] was adapted for the present configuration of the input videos. There are two main stages in this method: Image processing and analysis, which are available in ImageJ plugins for free use [29].…”

Section: Mvws Elevation Measurementsmentioning

confidence: 99%

“…In this work, the procedure to obtain the measurements of MVWS elevations based on contours [29] was adapted for the present configuration of the input videos. There are two main stages in this method: Image processing and analysis, which are available in ImageJ plugins for free use [29]. Figure 3 illustrates the procedure to obtain the measurements for the data used in the present work:…”

Section: Mvws Elevation Measurementsmentioning

confidence: 99%

“…Furthermore, the snapshots presented in [9,12] clearly show that the initial stages of some shipping water events have these features. Recently, Hernández-Fontes et al [29] introduced the concept of multiple-valued water surface (MVWS) elevations to refer to the amplitudes of the several water surfaces that can be measured at a specific location, along a horizontal domain, in some 2D hydrodynamic experiments, as illustrated in Figure 1b. Hereafter, the SVWS and MVWS definitions are employed to describe this work.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, new approaches to investigate the water elevations should be considered, because this type of event presents MVWS elevations. To contribute to this, Hernández-Fontes et al [29] extended the method of [31], providing an open-source and simplified image-based approach to obtain MVWS elevation measurements, as shown in Figure 1b.…”

Section: Introductionmentioning

confidence: 99%

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On the Evolution of Different Types of Green Water Events

Hernández-Fontes

Hernández

Mendoza

et al. 2021

Water

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Green water events may present different features in the initial stage of interaction with the deck of a structure. It is therefore important to investigate the evolution of different types of green water, since not all the events interact with the deck at the same time. In this paper, the evolution of three types of green water events (dam-break, plunging-dam-break, and hammer-fist) are studied. The water surface elevations and volumes over the deck in consecutive green water events, generated by incident [wave trains in a wave flume, were analyzed using image-based methods. The results show multiple-valued water surface elevations in the early stage of plunging-dam-break and hammer-fist type events. Detailed experimental measurements of this stage are shown for the first time. The effect of wave steepness on the duration of the events, maximum freeboard exceedance, and volumes were also investigated. Although the hammer-fist type showed high freeboard exceedances, the plunging-dam-break type presented the largest volumes over the deck. Some challenges for further assessments of green water propagation are reported.

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Section: Mvws Elevation Measurementsmentioning

confidence: 99%

Section: Mvws Elevation Measurementsmentioning

confidence: 99%

Section: Mvws Elevation Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the Evolution of Different Types of Green Water Events

Hernández-Fontes

Hernández

Mendoza

et al. 2021

Water

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Evaluation of the influence of deck slope on green water loads using the wet dam-break approach

Rodríguez-Ocampo,

Fontes,

Ring

et al. 2023

J Braz. Soc. Mech. Sci. Eng.

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Experiments in an enclosed Wave–Wind Flume environment to study the dynamics of a small-scale Floating Offshore Wind Turbine

Bernal-Camacho,

Mendoza,

Fontes

et al. 2024

J. Ocean Eng. Mar. Energy

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The global floating offshore wind industry is experiencing rapid growth, but stability regulations are often limited. Reducing platform motions can increase turbine efficiency and support hybrid wind-wave energy systems. This paper presents an experimental study on the dynamics of a Floating Offshore Wind Turbine (FOWT) conducted in an enclosed Wave–Wind Flume (WWF) employing an image-based methodology. The study analyzes the effects of different sea states and the role of a Centerboard and Heave plate (CH) system in decreasing the platform’s motions. The study confirms a significant decrease in overall platform response, approximately 6%, along the longitudinal plane under various sea conditions due to the implemented system. Notable changes were also observed in the Response Amplitude Operators (RAO) at different periods, particularly pitch motion, which showed an average reduction of 27%. The surge, heave, and pitch responses consistently showed lower values when the system was installed, with a mean decrease of 25% across test cases. These results demonstrate the CH’s effectiveness in improving the platform’s dynamics and indicate that it can be integrated into other floating platforms’ designs to assess and improve their performance under distinct sea conditions.

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A simplified and open-source approach for multiple-valued water surface measurements in 2D hydrodynamic experiments

Cited by 8 publications

References 34 publications

On the Evolution of Different Types of Green Water Events

On the Evolution of Different Types of Green Water Events

Evaluation of the influence of deck slope on green water loads using the wet dam-break approach

Experiments in an enclosed Wave–Wind Flume environment to study the dynamics of a small-scale Floating Offshore Wind Turbine

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