Special Hydrodynamic Features Of Jet Currents
In River Mouths
Author(s)
R. Khanbilvardi, B. Shteinman & O. Ozkurt
Abstract
The results of measurements as well as theoretical analysis, have led to the
revealing of a number of special features of mouth currents: turbulence structure
characterized by the presence of a hierarchy of energy supply zones in the
velocity spectra; the scales of such zones vary in accordance with degeneration
of the river turbulence structure with the advance of the jet current into the
receiving water body. The longitudinal dimensions of turbulent eddies get
smaller with the distance from the mouth gauge, while their orientation is
changing from the predominantly vertical-longitudinal rotation with a horizontal
axis to the predominantly horizontal-transversal rotation with a vertical axis. In
the zone of mixing river and sea waters, the energy spectra become more narrowband,
their ordinates lowering as the river jet moves forward from the mouth,
while the maximum spectral density shifts to the area of lower frequencies.
Farther from the mouth, in the spectra of the river jet current there appear
frequency intervals that can be described not by the known Kolmogorov’s "-5/3"
law but by the "-7/3" law. This feature is due to the increasing friction on the
side boundaries of the jet. As the river jet moves beyond the mouth bar, another
frequency interval appears in the energy spectra; it can be described by the "-3"
law. This is attributed to the consumption of energy by the river jet flow for
overcoming the ascending forces when the process of vertical mixing of river
and sea water masses is going on beyond the bar.
Keywords: river mouth, turbulence structure, energy spectra, conceptual
physical model.
Keywords
river mouth, turbulence structure, energy spectra, conceptual
physical model.
Related Book
Other papers in this volume
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