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              <p>This work considers the Shallow Water equations (SWE) and proposes a high order conservative scheme based on a Lagrange-Projection decomposition. The high order in space and time are achieved using Discontinuous-Galerkin (DG) and Runge-Kutta (RK) strategies. The use of a Lagrange-Projection decomposition enables the use of time steps that are not constrained by the sound speed thanks to an implicit treatment of the acoustic waves (Lagrange step), while the transport waves (Projection step) are treated explicitly. We prove that our scheme satisfies the well-balanced property as well as non linear stability properties. Numerical evidences are also given.</p>
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