Breaking in water wave models
Connections for Women: Dispersive and Stochastic PDE August 19, 2015 - August 21, 2015
Location: SLMath: Eisenbud Auditorium
breaking - instability - discontinuity
water waves modelling
ocean waves
ill-posedness
non-linear PDE
dispersive PDE
shallow waves
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The surface of an ocean wave, after some time, may become vertical and accelerate infinitely rapidly; thereafter a portion of the surface overturns, projects forward and forms a jet of water. Think of the stunning Hokusai wave. The complexity of the governing equations of the water wave problem, however, prevents a detailed account of "breaking." Whitham in the 1970s conjectured that a model combining the water wave dispersion and a nonlinearity of the shallow water equations would capture the phenomenon. I will present its proof and use Whitham's model to illustrate the Benjamin-Feir instability of Stokes' periodic waves in water. I will discuss breaking, instabilities and ill-posedness for related, nonlinear dispersive equations.
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