Direct and large-eddy simulations of internal tide generation at a near-critical slope
Bishakhdatta Gayen, Sutanu Sarkar
JOURNAL OF FLUID MECHANICS | CAMBRIDGE UNIV PRESS | Published : 2011
A numerical study is performed to investigate nonlinear processes during internal wave generation by the oscillation of a background barotropic tide over a sloping bottom. The focus is on the near-critical case where the slope angle is equal to the natural internal wave propagation angle and, consequently, there is a resonant wave response that leads to an intense boundary flow. The resonant wave undergoes both convective and shear instabilities that lead to turbulence with a broad range of scales over the entire slope. A thermal bore is found during upslope flow. Spectra of the baroclinic velocity, both inside the boundary layer and in the external region with free wave propagation, exhibit..View full abstract
Awarded by NSF
Awarded by Directorate For Geosciences
We acknowledge financial support through NSF grant 0825705 (programme manager Eric Itsweire).