Weekly seminar series hosted by the Acoustics Graduate Program
FREE
ETC 2.136
Participate via Zoom: https://utexas.zoom.us/j/89800528173
Speaker
Nicholas P. Chotiros
Applied Research Laboratories
The University of Texas at Austin
Abstract
After an assignment to the London office of the Office of Naval Research Global, a research collaboration with the National Oceanography Centre in Southampton, UK was initiated to investigate the feasibility of characterizing Arctic ice by its acoustic response. The reflection of acoustic pulses from the underside of an ice sheet is predicted to generate leaky Lamb wave resonances. Initial computer simulations were performed for a uniform ice sheet, using both a wavenumber integration method and a finite element code. The latter was run on the Texas Advanced Computing Center. To verify the computer simulations, plans were made for an experiment in the Roland von Glasow Air-Sea-Ice Chamber at the University of East Anglia, UK, in which seawater in a test tank is frozen from the top and interrogated by acoustic transducers below. Previous work in the chamber showed that the ice is not uniform, and further computer models were constructed to match the expected profile. It was concluded from this work that a porous-medium wave-propagation model is needed to represent the acoustic response due to the brine channels within the ice.