A simplified and open-source approach for multiple-valued water surface measurements in 2D hydrodynamic experiments
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(2020) 42:623
TECHNICAL PAPER
A simplified and open‑source approach for multiple‑valued water surface measurements in 2D hydrodynamic experiments Jassiel V. Hernández‑Fontes1 · Irving D. Hernández2 · Rodolfo Silva3 · Edgar Mendoza3 · Paulo T. T. Esperança4 Received: 2 May 2020 / Accepted: 25 October 2020 © The Brazilian Society of Mechanical Sciences and Engineering 2020
Abstract Water elevation measurements in 2D hydrodynamic experiments are widely used for validating analytical and numerical models. Experimental research has shown that some phenomena can present multiple-valued water surfaces. However, conventional wave probe sensors do not provide measurements of these surfaces, which is required for appropriate model comparisons. This paper aims to propose a simplified and open-source image-based methodology to measure the spatiotemporal evolution of multiple-valued water surface elevations observed in two-dimensional hydrodynamic experiments, considering the problem of shipping water on a fixed structure as the topic of application. This approach examines the stages of image processing and analysis through morphological operations, which have been implemented in plugins for free use in the open-source ImageJ software. Measurements performed in two experimental study cases of shipping water on the deck of a fixed structure, due to single and multiple incident waves, were compared with measurements taken by conventional wave probe sensors and manual tracking to verify the performance of the methodology. The results obtained give the time series of elevation of multiple-valued water surfaces, which can be obtained at any desired position over the horizontal domain of the images, at low cost and high computational efficiency. The present approach has been made available for its free use and can be adapted to analyze the spatio-temporal flow evolution in a wide range of 2D hydrodynamic experiments. Keywords Morphological operations · Multiple-valued surfaces · Water elevation measurements · Open-source · 2D experiments · Shipping water
1 Introduction Technical Editor: Erick Franklin. * Jassiel V. Hernández‑Fontes [email protected] 1
Departamento de Engenharia Naval, EST‑UEA, Escola Superior de Tecnologia, Universidade do Estado do Amazonas, Av. Darcy Vargas 1200, Parque Dez de Novembro, Manaus 69050‑020, Brazil
2
NEO (Núcleo de Estruturas Oceânicas), Programa de Engenharia Oceânica, COPPE, Universidade Federal do Rio de Janeiro, Centro de Tecnologia, bloco I‑208, Cidade Universitária, Rio de Janeiro 20945‑970, Brazil
3
II‑UNAM, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Ciudad Universitaria, Edificio 17, Mexico City 04510, Mexico
4
LABOCEANO (Laboratório de Tecnologia Oceânica), Programa de Engenharia Oceânica, COPPE, Universidade Federal do Rio de Janeiro, Rua Paulo Emídio Barbosa 485, Parque Tecnológico da UFRJ, Rio de Janeiro 21941‑907, Brazil
Measuring the water surface elevations in two-dimensional (2D) hydrodynamic experiments is of importance in seve
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