May 13: "Experimental modeling of internal tide generation"

Experimental modeling of internal tide generation


There has been a recent thrust to improve the description of the
internal tide generation process. A conclusion drawn from field studies
(Rudnick et al. 2003), satellite observations (Egbert & Ray 2000) and
numerical simulations (Simmons et al. 2004) is that steep, nominally 2D
ocean ridges are particularly significant contributors to the
internal-tide budget. Once excited, internal waves may be dissipated
locally or travel long distances to be dissipated, for example, by
critical reflections along the continental shelf. Determining how
internal tidal energy is ultimately dissipated requires that the
vertical structure of the wave field is well-known. In the present talk,
I will summarize a recent theory, due to Petrelis et al. (2006), which
examines the (linear) waves generated by both sub- and super-critical 2D
topography. Laboratory experiments will be described, which test key
results from the model. A methodology for extracting the vertical modes
of internal waves from laboratory images with parallax image loss will
also be presented. Directions for future work will be discussed. (Study
done in collaboration with Tom Peacock, Neil Balmforth, Damon Vander
Lind and Paula Echeverri).

Morris Flynn is presently a post-doc a MIT working with Drs. John Bush
(Applied Math) and Tom Peacock (Mechanical Eng.). He received his Ph.D.
from the Univ. of California - San Diego (Eng. Sci.) in 2006. Over the
past decade, Morris has pursued research projects in several areas
including environmental transport, low-energy building ventilation and
biological fluid mechanics.