with the range of theoretically calculated frequencies (see Fig. 6 displaying a
spectrum of plume oscillations and the range of frequencies obtained from the linear
stability analysis).
The results of more complicated experiments in the LTST are described in [20].
The experiments were set up to model a turbulent fountain interacting with a
thermocline with the parameters similar to those of a modeled wastewater plume
(Fig. 7). The fountain was formed by a turbulent vertical jet providing vertical
velocity profiles at the inflow of the jet to the thermocline similar to those in the
experiments modeling wastewater plumes.
Fig. 5 Vector velocity field of turbulent buoyant plume (left) and vertical velocity profiles in
cross “Introduction”, “Generation of Internal Waves by Turbulent Buoyant Plumes” and
“Structure and Energetics of Internal Waves” (right)
Fig. 6 Spectrum of
oscillations of the upper
boundary of the jet. The
marked area corresponds to
the calculated limits of
variations of the possible
frequency of self-sustained
oscillations
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