Benthic Turbulence and Mixing Induced by Nonlinear Internal Waves

Content Provider	Semantic Scholar
Author	Diamessis, Peter J.
Copyright Year	2007
Abstract	Abstract : The transition to a primary instability in the footprint of nonlinear internal waves of depression was investigated using spectral multidomain-based numerical simulations. The fully nonlinear internal wave fields were supplied through a highly nonlinear extended Korteweg De Vries algorithm generated by Sakai & Redekopp (2007). Results were qualitatively similar to the findings of Diamessis and Redekopp (2006). In the absence of an oncoming current, no transition was observed. Introducing a current and with a sufficiently strong wave amplitude and Reynolds number, the separated bottom boundary layer under the wave and behind its trough experienced a shear instability, accompanied by vortex shedding, powerful bottom shear-stresses and strong near-bed vertical velocities, indicating potential for resuspension. The vortex shedding was intermittent, consisting of bursts of 5-6 eject vortices alternating with calm periods. A subcritical nonlinear transition to turbulence was also identified and is currently under investigation.
File Format	PDF HTM / HTML
DOI	10.21236/ada533693
Alternate Webpage(s)	http://www.dtic.mil/dtic/tr/fulltext/u2/a520127.pdf
Alternate Webpage(s)	http://www.dtic.mil/dtic/tr/fulltext/u2/a573263.pdf
Alternate Webpage(s)	http://www.dtic.mil/dtic/tr/fulltext/u2/a533693.pdf
Alternate Webpage(s)	https://doi.org/10.21236/ada533693
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article