atmospheric-transport-over-terrain.pptx (10.58 MB)

Atmospheric transport over terrain

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posted on 10.12.2016 by James Shaw
Almost all operational weather forecast models represent terrain using terrain-following meshes that become highly-distorted over steep slopes.  An alternative is the cut cell method but, while cut cell meshes are less distorted compared to terrain-following meshes, arbitrarily small cut cells are created that constraint the time-step for explicit numerical methods.

This motivates a new type of mesh that avoids arbitrarily small cells and most mesh distortions.  Combined with a new transport scheme that is formulated for stability and accuracy over steep slopes on arbitrarily-structured meshes, we alleviate numerical instabilities and inaccuracies associated with traditional transport schemes.

Presented at the Royal Meteorological Society South East meeting at the University of Reading, 7th December 2016.

Funding

NERC PhD studentship

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