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On the local well-posedness of the 1D Green-Naghdi system on Sobolev spaces

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In this paper, we consider the local well-posedness of the 1D Green-Naghdi system. This system describes the evolution of water waves over an uneven bottom in the shallow water regime in terms of the water depth h and the horizontal velocity u. Using a Lagrangian formulation of this system on a Sobolev-type diffeomorphism group, we prove local well-posedness for (h,u) in the Sobolev space ([1-xi]+Hs(R))xHs+1(R),s>1/2, where xi : R -> R is the parameterization of the bottom and where we assume that the water surface has an equilibrium at height 1. This improves the present local well-posedness range by one degree.

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Wiley-V C H Verlag Gmbh

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Mathematics

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Mathematische Nachrichten

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10.1002/mana.202200256

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