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SUMMARY:Wave Propagation in Viscoelastic Materials over Water - Hayley She
 n (Clarkson University)
DTSTART:20171003T131500Z
DTEND:20171003T140000Z
UID:TALK83551@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Ice covers over water modify the mass\, energy\, and momentum 
 transfer between the atmosphere and ocean. Ocean wave propagation is one o
 f the numerous topics from these three basic processes. Because of the Arc
 tic ice reduction\, longer fetch has increased both the intensity and the 
 dominant wave period. Longer period waves damp much less. They thus propag
 ate further into ice covers. The contemporary Arctic system cannot be prop
 erly evaluated without a good grasp of the growing presence of waves under
  ice covers. Ice covers are complex materials. Even a continuous solid ice
  cover does not fit into a simple constitutive model. In the field ice cov
 ers often are consisted of discontinuous pieces of various sizes and shape
 s\, mixed with open water or slurry of ice crystals. Such a composite cove
 r has been idealized as a linear viscoelastic material. This hypothesis is
  based on a simple physical argument: all materials under deformation simu
 ltaneously store some and dissipate some energy. The first order approxima
 tion is therefore a linear viscoelastic model. To test this hypothesis\, t
 he dominant characteristics of the model must be thoroughly understood. Th
 e most important characteristic of wave propagation is the dispersion rela
 tion. Even with a simple linear viscoelastic model\, the dispersion relati
 on is complicated. There are many roots all satisfy the dispersion relatio
 n. All of them may be present under different conditions. In this talk\, a
  description of these roots and their physical meanings will be presented.
  Their presence has been found in other fields. Knowledge from other field
 s may shed light on how these different wave modes interact under differen
 t situations.&nbsp\;
LOCATION:Seminar Room 1\, Newton Institute
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