Bottom-boundary identification using asymptotic observers in dispersive shallow-water models

Abstract

In this paper we consider the problem of identifying the bottom-boundary of an ocean basin, particularly in the coastal region where shallow-water theory applies. In particular we develop an observer-based approach of identifying the bottom-boundary profile from measurements of the free-surface. In particular, we prove that the true profile can be obtained by minimising the long-time observation-error as computed from the observer equations associated with a class of linear dispersive shallow water-wave models. We provide an explicit easy-to-implement observer design guaranteeing convergence. Numerical simulations indicate the same optimisation problem can recover the true profile for the nonlinear versions of same dispersive water-wave models.