Comparison of quarter-plane and two-point boundary value problems: The KDV-equation

Abstract

This paper is concerned with the Korteweg-de Vries equation which models unidirectional propagation of small amplitude long waves in dispersive media. The two-point boundary value problem wherein the wave motion is specified at both ends of a finite stretch of length L of the media of propagation is considered. It is shown that the solution of the two-point boundary value problem converges as L → +∞ to the solution of the quarter-plane boundary value problem in which a semi-infinite stretch of the medium is disturbed at its finite end. In addition to its intrinsic interest, our result provides justification for the use of the two-point boundary value problem in numerical studies of the quarter plane problem for the KdV equation.

Publication Title

Discrete and Continuous Dynamical Systems - Series B

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