Research > Internal Waves
Internal waves are propagating disturbances of gravitationally-stable density stratifications. They are ubiquitous in the Earth's oceans (and also atmosphere), where they are generated by flow over ocean-floor topography and sea-surface winds. Dissipation of these internal waves impacts the Earth's climate by influencing large-scale ocean circulation, affecting plankton distribution, and perhaps even shaping the continental slopes. From an engineering perspective, internal waves affect the performance of underwater technology, such as acoustic communication, submersible vehicles and marine cabling. A detailed understanding of all aspects of internal wave generation and evolution is therefore both profoundly and practically important.
We are currently using the latest experimental and theoretical techniques to investigate important aspects of the tidal conversion process, as well as collaborating with numerical simulations. In addition, we participate in ocean-going studies, such as the recent IWAP cruise off Hawaii and the ONR NLIWI field studies in the Luzon Strait. Our internal wave research is funded by the ONR and the NSF Physical Oceanography program. We are currently filming a documentary on Internal Waves for the Discovery Channel.
3D Stereoscopic PIV
Internal wave investigations in the laboratory have been largely limited to two-dimensional and axisymmetric configurations. The ENDLab has recently utilized the flow field measurement technique of stereoscopic-PIV to study internal wave field in three dimensions. As a fruitful result, a wide range of experimental configurations are now possible for study. A detailed report of this study has been published in Experiments in Fluids.
- Peacock, T., and Weidman, P., "The effect of rotation on conical wave beams in a stratified fluid," Experiments in Fluids, 39, 32-37 (2005). [link]
- Peacock, T. and Tabaei, A., "Visualization of nonlinear effects in internal wave beam reflection," Physics of Fluids, 17, Art. No. 061702 (2005). [link]
- Alford, M.H., MacKinnon, J.A., Zhao, Z., Pinkel, R., Klymak, J. and Peacock, T., "Internal waves across the Pacific," Geophysical Research Letters 34 (24), L24601 (2007). [link]
- Peacock, T., Echeverri, P. and Balmforth, N.J., "Experimental investigation of internal tide generation by two-dimensional topography," Journal of Physical Oceanography, 38 (1), 235-242 (2008). [link]
- Balmforth, N.J. and Peacock, T., "Internal tide generation by supercritical topography," Journal of Physical Oceanography, 39, 1965-1974 (2009). [link]
- Echeverri, P., Flynn, M.R., Winters, K.B. and Peacock, T., "Low-mode internal tide generation: an experimental and numerical investigation," Journal of Fluid Mechanics, 636, 91-108 (2009). [link]
- Mathur, M. and Peacock, T., "Internal wave beam propagation in nonuniform stratifications," Journal of Fluid Mechanics, 639, 133-152 (2009). [link]
- Echeverrri, P. and Peacock, T., "Internal tide generation by arbitrary two-dimensional topography," Journal of Fluid Mechanics, 659, 247 (2010). [link]
- Mercier, M.J., Martinand, D., Mathur, M., Gostiaux, L., Peacock, T. and Dauxois, T., "New wave generation," Journal of Fluid Mechanics, 657, 308 (2010). [link]
- Peacock, T., Mercier, M.J., Didelle, H., Viboud, S. and Dauxois, T., "A laboratory study of low-mode internal tide scattering by finite-amplitude topography," Physics of Fluids, 21, 121702(2010). [link]
- Peacock, T. and Dabiri, J., "Introduction to Focus Issue: Lagrangian coherent structures," CHAOS, 20, 017501 (2010). [link]
- Tang, W.E. and Peacock, T., "Lagrangian coherent structures and internal wave attractors," CHAOS, 20, 017508 (2010). [link]
- Mathur, M. and Peacock, T., "Internal wave interferometery," Physical Review Letters, 104, 118501 (2010). [link]
- Echeverri, P., Yokossi, T., Balmforth, N.J. and Peacock, T., "Internal Tide Attractors Between Double Ridges," Journal of Fluid Mechanics, 669, 354-374 (2011). [link]
- Ghaemsaidi, S.J. and Peacock, T., "3D Stereoscopic PIV visualization of the axisymmetric conical internal wave field generated by an oscillating sphere," Experiments in Fluids, 54, 1454 (2013).
- Mathur, M., Carter, G. and Peacock, T., "Internal tide scattering by arbitrary two-dimensional topography in arbitrary stratifications," in preparation.
- Thomas Peacock
- Sasan Ghaemsaidi
Ph. D. Candidate
- Maha Haji
MIT-WHOI Joint Program student
- Matthieu Mercier
- Matthieu Leclair
- Zaïm Ouazzani
- Matthew Alford
Collaborator, University of Washington
- Neil Balmforth
- Glenn Carter
Collaborator, University of Hawaii
- Thierry Dauxois
Collaborator, ENS de Lyon
- Shaun Johnston
- Manikandan Mathur
- Kraig Winters