Session topic


Title: Improved discretization of grounding lines and calving fronts using an embedded-boundary approach in BISICLES
ID: O126
Type: Abstract
Session: MS25
Numerical methods towards next generation ice sheet modeling • Part I

Speaker: Daniel Martin (Berkeley/US)

Abstract - Text

Correctly representing grounding line and calving-front dynamics is of fundamental importance in modeling marine ice sheets, since the configuration of these interfaces exerts a controlling influence on the dynamics of the ice sheet. We have developed a front-tracking discretization for grounding lines and calving fronts based on the Chombo embedded-boundary cut-cell framework. This promises better representation of these interfaces vs. a traditional stair-step discretization on Cartesian meshes like those currently used in the block-structured AMR BISICLES code. The dynamic adaptivity of the BISICLES model complements the subgrid-scale discretizations of this scheme, producing a robust approach for tracking the evolution of these interfaces. Also, the fundamental discontinuous nature of flow across grounding lines is respected by treating it as a material phase change. We present examples of this approach to demonstrate its effectiveness.