Abstract
We study mixed finite element methods for the rotating shallow water equations with linearized momentum terms but nonlinear drag. By means of an equivalent second-order formulation, we prove long-time stability of the system without energy accumulation. We also give rates of damping in unforced systems and various continuous dependence results on initial conditions and forcing terms. A priori error estimates for the momentum and free surface elevation are given in \(L^2\) as well as for the time derivative and divergence of the momentum. Numerical results confirm the theoretical results regarding both energy damping and convergence rates.
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Cotter, C.J., Graber, P.J. & Kirby, R.C. Mixed finite elements for global tide models with nonlinear damping. Numer. Math. 140, 963–991 (2018). https://doi.org/10.1007/s00211-018-0980-4
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DOI: https://doi.org/10.1007/s00211-018-0980-4