@article{15682f688e9746a78596d33eb710084d,
title = "Simultaneous optical velocity and density measurements of resonant nonlinear internal waves in pycnocline",
abstract = "We report on an experimental study of two-dimensional resonant internal standing waves excited by an immersed oscillating cylinder in a narrow rectangular basin. The basin is filled by two miscible liquids of close densities separated by a thin pycnocline. Simultaneous measurements of both velocity components by Particle Image Velocimetry and of the density field Background-Oriented Schlieren revealed complex spatiotemporal structure of the internal wavefield; each temporal harmonic contains multiple coexisting spatial modes. The study emphasizes the contribution of the nonlinear effects. A theoretical model is suggested that guides the data analysis procedure developed to identify individual modes and to reveal interactions between them. The model reproduces adequately the decrease of about 10\% in the amplitude of the density variation due to cubic nonlinearity.",
author = "S. Kalenko and E. Mogilevskiy and E. Zemach and L. Shemer",
note = "Publisher Copyright: {\textcopyright} 2025 Author(s).",
year = "2025",
month = aug,
day = "1",
doi = "10.1063/5.0275821",
language = "אנגלית",
volume = "37",
journal = "Physics of Fluids",
issn = "1070-6631",
publisher = "American Institute of Physics",
number = "8",
}