Coupling approximation levels for modeling for ice sheet and shelf systems
Eef van Dongen

Supervisor: Martin van Gijzen

Site of the project:
Stockholm University
Department of Physical Geography

Daily supervisor Stockholm University: Nina Kirchner

start of the project: September 2016

The Master project has been finished in July 2017 by the completion of the Masters Thesis and a final presentation has been given.

For working address etc. we refer to our alumnipage.

Summary of the master project:
Ice sheets such as Greenland and Antarctica consist of both grounded ice and floating ice, the latter called ice shelves. The aim of the research project is to extend the ISCAL (Ice Sheet Coupled Approximation Levels) method, as described in (J. Ahlkrona et al. 2015), that combines the non-linear incompressible Navier Stokes equations (NS) with the zeroth order Shallow Ice Approximation (SIA).

First, the method itself needs to be improved since it has shown to be instable for realistic, detailed bed topographies. The final goal is to extend the method to model ice shelves with the Shallow Shelf Approximation (SSA). The part of the domain where the SSA is applied should be determined automatically and dynamically based on estimates of the modelling error, as is done with the SIA by J. Ahlkrona.

With the implementation of the SSA, we aim to compute the solution substantially faster with a low reduction in accuracy compared to solving the full non-linear Navier Stokes equations, which makes this method suitable for simulations over a very long time span (~100.000 years).

Finally, the extended ISCAL method can be applied to conceptual model problems and possibly the former Svalbard/Barents Sea Ice Sheet. The extension will be implemented in the finite element software Elmer/Ice.

Contact information: Kees Vuik

Back to the home page or the Master students page of Kees Vuik