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We consider an asymptotic 1D (in space) rotation-Camassa-Holm (R-CH) model,which could be used to describe the propagation of long-crested shallow-waterwaves in the equatorial ocean regions with allowance for the weak Corioliseffect due to the Earth's rotation. This model equation has similarwave-breaking phenomena as the Camassa-Holm equation. It is analogous to therotation-Green-Naghdi (R-GN) equations with the weak Earth's rotation effect,modeling the propagation of wave allowing large amplitude in shallow water. Weprovide here a rigorous justification showing that solutions of the R-GNequations tend to associated solution of the R-CH model equation in theCamassa-Holm regime with the small amplitude and the larger wavelength.Furthermore, we demonstrate that the R-GN model equations are locallywell-posed in a Sobolev space by the refined energy estimates.

On a shallow-water approximation to the Green-Naghdi equations with the Coriolis effect