Home | Legals | Data Protection | KIT

GRAL (Graz Lagrangian Model)


GRAL is a micro-scale Lagrangian dispersion model developed by the Institute for Internal Combustion Engines and Thermodynamics of TU Graz.

The model is employed in both flat and complex terrain as well as built-up areas with model domains reaching from 100m to 50km. It involves special algorithms to deal with dispersion from tunnel portals and under conditions of low wind speed. Prominent applications comprise the study of abatement strategies for PM10 within Klagenfurt’s Anti PM10 Action Program and the evaluation of air quality improvements within the frame of the environmental assessment for the Brenner Base Tunnel. For a compact description of the model including an extensive list of references please refer to the corresponding entry in the Model Documentation System of the European Topic Centre on Air and Climate Change.

At IMK-IFU, Gral was applied for theinvestigation of the impact of different traffic emission scenarios for Santiago de Chile within the Risc Habitat Megacity project and is curently applied for Augsburg.




Modelled 2006 annual mean NO2 from traffic for Santiago de Chile (J. Werhahn). Modelled annual mean value for PM10 within the Lower Inn valley (U.Uhrner, TU GRAZ).


Model description

Contact: Johannes Werhahn