Evolution of an isolated turbulent region in a stratified fluid
Article first published online: 20 SEP 2012
Copyright 1998 by the American Geophysical Union.
Journal of Geophysical Research: Oceans (1978–2012)
Volume 103, Issue C11, pages 24857–24868, 15 October 1998
How to Cite
1998), Evolution of an isolated turbulent region in a stratified fluid, J. Geophys. Res., 103(C11), 24857–24868, doi:10.1029/98JC01911., , and (
- Issue published online: 20 SEP 2012
- Article first published online: 20 SEP 2012
- Manuscript Accepted: 1 DEC 1997
- Manuscript Received: 25 MAR 1997
This paper reports an experimental study on the evolution of an isolated turbulent region in an otherwise quiescent linearly stratified fluid. A turbulent patch was generated by pulsed horizontal injection of a small volume of fluid. It was found that the turbulent blob thus produced initially grows as in a nonstratified fluid for a nondimensional time period of Nt ≈ 4–5 (with N the buoyancy frequency), attains a maximum height, and then physically collapses slowly to form a planar, quasi-two-dimensional dipole pattern. The timescale for the physical collapse of the blob was found to be much larger than that of the turbulence collapse. Scaling arguments are presented to explain the evolution of the turbulent region, and the experimental results are compared with the model predictions.