Steady, Shallow Ice Sheets as Obstacle Problems: Well-Posedness and Finite Element Approximation

  title={Steady, Shallow Ice Sheets as Obstacle Problems: Well-Posedness and Finite Element Approximation},
  author={Guillaume Jouvet and Ed Bueler},
  journal={SIAM Journal of Applied Mathematics},
We formulate steady, shallow ice sheet flow as an obstacle problem, the unknown being the ice upper surface and the obstacle being the underlying bedrock topography. This generates a free-boundary defining the ice sheet extent. The obstacle problem is written as a variational inequality subject to the positive-ice-thickness constraint. The corresponding PDE is a highly nonlinear elliptic equation which generalizes the p-Laplacian equation. Our formulation also permits variable ice softness… CONTINUE READING
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