On the method of strained parameters for a KdV type of equation with exact dispersion property

This paper provides an alternative methodology for analysis of three-wave interactions under the exact dispersion relation associated with gravity waves in fluid of intermediate depth. A Korteweg-de Vries type of equation with exact dispersion property is adopted as the governing equation for unidirectional wave packet evolution. Following the idea from Zakharov's seminal paper (Zakharov, V. E. (1968) Stability of periodic waves of finite amplitude on the surface of a deep fluid. J. Appl. Mech. Tech. Phys., 9, 190-194), the equation is transformed from the spatialoral domain to the wavenumberoral domain. The solution of the transformed equation is sought using the perturbation theory, for which the ansatz is expressed in the form of a regular expansion in the increasing order of a small parameter. After implementing the naïve perturbation method, due to non-linear mode generation and particular combinations of wavenumbers, the third-order solution contains spurious secular growth terms that appear as a consequence of resonant interaction and non-linear mode generation. These spurious secular growth terms can be prevented by implementing the method of strained parameters for which non-linear dispersion relation terms are produced for particular combination of wavenumbers.