Orateur
Catherine Sulem
(University of Toronto)
Description
Co-authors: Philippe Guyenne, Adilbek Kairzhan
Abstract: This study concerns the motion of nonlinear hydroelastic waves along a com- pressed ice sheet lying on top of a two-dimensional fluid of infinite depth. Applying tech- niques of Hamiltonian perturbation theory, a Hamiltonian Dysthe equation is derived for the slowly varying envelope of modulated wavetrains. The derivation is further complicated by the presence of cubic resonances. A Birkhoff normal form transformation is introduced to eliminate non-resonant triads while accommodating resonant ones. Numerical solutions constructed from the Dysthe equation are compared to direct simulations of the full Euler system, and very good agreement is observed.