Rotating and Stratified Fluids (IAPSO, IAGA, IAMAS, SEDI)
Thursday, July 10 AM
Location: Site B, Room 21
TIME [ 1200 ] [ JSP10/10A/B21-009 ]
STRONG TURBULENCE OF INTERNAL NONLINEAR KELVIN WAVES
Vadim V. NOVOTRAYSOV(V.I.Il`ichev Pacific Oceanological Institute, FAR-EASTERN BRANCH OF RUSSIAN ACADEMY OF SCIENCES)
Turbulence at boundaries in rotating stratified fluids is supposed to beconsidered as a random field of weak nonlinear internal Kelvin waves (IKW).Theory of this turbulence is considered on the base of Burger′s equation.It is shown that the energy spectrum of this turbulences has a universalstructure: on the young-age stage the energy spectrum is proportional to thethird power of the frequency, on the old-age stage the energy spectrum isproportional to the second power of the frequency at small frequencies anddecreases exponentially at high frequencies. The coefficient of theproportionality is determined by the nonlinear effects on the initial stageof the propagation.We presented observations of the IWK in the coastal zone of Japan sea.Data collected from moored instrument and repeated profile measurementsduring the September 1999 show an energetic, large amplitude semidiurnalIWK. Spectrums of temperature, current variations and IWK are constructed.Comparison of IWK spectrum with model random nonlinear IWK spectrum hasrevealed their good agreement. Work supported by RFBR grants 02-05-64277.