#Ausplume user manual software

Can only be computed from annual mean concentrations using the `deposition velocity` approach. Local, one and a half-order (k-L-model) for the wind field (GRAMM). Upper limit: no technical limit for GRAMM and GRAL.įor the wind field modeling (GRAMM) either first order upwind or TVD. The model has been validated for averaged concentrations between 10 min and 1 hour. It has not been tested for domains larger than 500 km x 500 km nor has it been nested with numerical weather models, such as European Center for Medium-Range Weather Forecasts ECMWF (). GRAMM does not take into account cloud-processes, run-off, etc. Inhomogenous wind fields and buildings can not be taken into account for the dispersion calculation from tunnel portals. There are restrictions regarding time-series simulations. GRAL has no treatment for heavy gas dispersion.

#Ausplume user manual software

Grafical representation is currently done with the commercially available software SURFER from Golden Software and ARCGIS from ESRI. Odour dispersion is also treated via postprocessing routines to obtain annual frequencies of odour annoyance. to compute annual means, percentiles, maximum concentrations, daily means, etc.). There exist different post-processing routines for analysing the computed concentrations with GRAL (e.g. It has special algorithms for treating dispersion in low wind speed conditions and for treating dispersion from tunnel portals. The dispersion is calculated using the Lagrangian particle model GRAL, which is able to cope with vertical inhomogeneous turbulence and inhomogeneous 3D wind-fields. The latter approach is only validated for flat terrain at the moment. Buildings can also be taken into account either using a simple diagnostic approach, which improves the results compared to neglecting buildings, or using an advanced approach, where the Navier-Stokes Equations are solved. In case of complex terrain or buildings, a mesoscale model is used for the wind field calculations (GRAMM=Graz Mesoscale Model). Also data computed from sonic-anemometers can be used. It is possible to use time-series of meteorological data as well as statistcs of wind speed, direction, and stabiltiy class. It has three different meteorological pre-processors depending on the input data. Line-Sources, Point-Sources, Tunnel Portals, Area-Sourcesįlat- and Complex-Terrain, Built-up areas.Ĭoupled Eulerian (GRAMM) - Lagrangian model (GRAL) for the Micro- Mesoscale. Institute for Internal Combustion Engines and Thermodynamics Institute for Internal Combustion Engines and Thermodynamics, Air Qualtiy Department Styria Institute for Internal Combustion Engines and Thermodynamics, Graz University of 25, 8010, Graz, Austria References about model development (up to 5)ĭietmar Oettl, Raimund Almbauer, Peter Sturm Level of knowledge needed to operate modelĪvailability and Validation of Input data