2017-05-01
ხუთშაბათს, 4 მაისს , 16:00 საათზე, ფიზიკის მცირე აუდიტორიაში (თსუ II კორპუსის #227 აუდიტორია) ჩატარდება ზუსტ და საბუნებისმეტყველო მეცნიერებათა ფაკულტეტის ფიზიკის დეპარტამენტის სასწავლო-სამეცნიერო სემინარი.
მოხსენების თემა: "Instabilities of Internal Gravity Wave Beams"
მომხსენებელი: Thierry Dauxois (CNRS & ENS de Lyon, France)
ანოტაცია: Internal
gravity waves play a primary role in geophysical fluids: they
contribute significantly to mixing in the ocean and they redistribute
energy and momentum in the middle atmosphere. Until recently, most of
the studies were focused on plane-wave solutions. However, these
solutions are not a satisfactory description of most geophysical
manifestations of internal gravity waves, and it is now recognized that
internal wave beams with a locally confined profile are ubiquitous in
the geophysical context. We will discuss the reason for their ubiquity
in stratified fluids, since they are solutions of the nonlinear
governing equations. Moreover, in the light of the recent experimental
and analytical studies of those internal gravity beams, it is timely to
discuss the two main mechanisms of instability for those beams: the
triadic resonant instability and the streaming instability.
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