Surface manifestations of internal waves investigated by a subsurface buoyant jet: Part 2. Internal wave field

• Published in: Izvestiya. Atmospheric and oceanic physics Vol. 46; no. 3; pp. 347 - 359
• Main Authors: Bondur, V. G., Grebenyuk, Yu. V., Ezhova, E. V., Kazakov, V. I., Sergeev, D. A., Soustova, I. A., Troitskaya, Yu. I.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01-06-2010; Springer Nature B.V
• Subjects: Climatology; Earth and Environmental Science; Earth Sciences; Geophysics; Geophysics/Geodesy; Internal waves; Marine; Simulation; Stratification; Temperature; Theory; Thermocline; Turbulence; Oceanic Physic; Surface Manifestation; Buoyancy Frequency; Collector Model; Internal Wave
• ISSN: 0001-4338; 1555-628X
• DOI: 10.1134/S0001433810030084

In a large test reservoir with artificial temperature stratification at the Institute of Applied Physics, Russian Academy of Sciences, a major simulation of internal wave actuation by buoyant turbulent jets generated by wastewater flows from underwater collector diffusers in conditions of temperature stratification with deep and shallow thermocline has been performed. Using a modification of the particle tracing velocimetry (PTV) method in the stratification mode with shallow thermocline, the velocities of currents generated by internal waves at the surface of the water area are measured. A theoretical model is developed describing the fields of internal waves in the presence of jet stream. Dispersion relations and structures of lower (first and second) modes of internal waves in the stratified basin for different rates of liquid outflow from the collector model are obtained. The experimentally measured field of isothermal shifts with respect to the system of characteristic modes of internal waves is decomposed. A mixed regime of internal wave actuation with the simultaneous existence of the first and second modes is observed. The characteristics of perturbations in the liquid column and on its surface are compared. This analysis allows us to prove that the velocity fields on the surface are indeed surface manifestations of internal waves.