Steady, Shallow Ice Sheets as Obstacle Problems: Well-Posedness and Finite Element Approximation
Steady, Shallow Ice Sheets as Obstacle Problems: Well-Posedness and Finite Element Approximation
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稳定的浅冰盖作为障碍问题:适定性和有限元近似
DOI:
10.1137/110856654
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发表时间:
2012
期刊:
影响因子:
--
通讯作者:
E. Bueler
中科院分区:
文献类型:
--
作者:
G. Jouvet;E. Bueler
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-Laplacian equation. Our formulation also permits variable ice softness, basal sliding, and elevation-dependent surface mass balance. Existence and uniqueness are shown in restricted cases which we may reformulate as a convex minimization problem. In the general case we show existence by applying a fixed point argument. Using continuity results from that argument, we construct a numerical solution by solving a sequence of obstacle-Laplacian-like problems by finite element approximation. As a real application, we compute the steady-state shape of the Greenland ice sheet in a steady present-day climate.
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