Surface manifestations of internal waves investigated by a subsurface buoyant jet: Part 2. Internal wave field |
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| Authors: | V G Bondur Yu V Grebenyuk E V Ezhova V I Kazakov D A Sergeev I A Soustova Yu I Troitskaya |
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| Institution: | 1.Aerokosmos Scientific Center of Aerospace Monitoring,Moscow,Russia;2.Institute of Applied Physics,Russian Academy of Sciences,Nizhni Novgorod,Russia |
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| Abstract: | 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. |
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