科研之友
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摘要
We have developed a new adaptive finite volume scheme for numerical simulations of ice sheets and glaciers. The mathematical basis of the adaptive solver is represented by the finite volume method and irregular Voronoi cell grids. Evaluation of spatial derivatives are obtained at cell edges from approximating the ice surface elevation locally by second-order polynomials following a least squares approach. The proposed scheme includes a simple and accurate method for handling discontinuities in ice thickness gradients along ice margins. The flexibility of the Voronoi cell structure allows for local mesh refinement in selected areas. We show how increased mesh density along a steep ice margin may considerably increase overall numerical accuracy of an ice sheet simulation. Although the numerical scheme is not restricted to ice sheet representations using the shallow ice approximation (SIA), we here use analytical SIA solutions to test the accuracy of the method.
- 出版日期2010-1-26
